Arduino Sim800l Relay Control with SMS | Control Home Appliances with Arduino and Sim800l

This is a very simple project based on Arduino and SIM800L GSM module. You can control electrical home appliances by using SIM800L that is connected to a 2 channel relay module.
In this tutorial, you will be able to use the SIM800L GSM module for controlling anything through SMS. To do that, you just need to parse the incoming SMS from SIM800L extract message. After extracting the message Arduino will control your home appliances according to received SMS.
There are lot of GSM module available in the market but I personally recommends and prefers SIM800L due to its small size.
#Arduino #Sim800l #ArduinoTutorials
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Code Download Link
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github.com/ahm...
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Parts Needed
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1 - Arduino UNO - amzn.to/3ZWKAz2
2 - SIM800L GSM Module - amzn.to/3l6rKGP
3 - Two Channel Relay Module - amzn.to/3l1aoem
4 - Mobile Charger 5v 2A
5 - Two Electrical Bulbs
6 - Jumper Wires (Male-Male / Male-Female / Female-Female)
5 - AC Power Extension - amzn.to/3Jvhoti
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Disclaimer
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Disclaimer: All videos are for educational purposes and use them wisely. Any video may have a slight mistake, please take decisions based on your research. This video is not forcing anything on you.
Warning: In some countries it is required to register gsm module from govt authorities before using it. So, get proper understanding of govt laws related to gsm technologies.
High Voltages be careful

[@gerardoscotta1642]

Muy buen proyecto y bien explicado. Gracias

[@rajaduraisangari]

Dear sir, how to turn off the relay after 3 seconds automatically? Pls change the code for me thanks

[@AhmadLogs]

Please wait

[@NextGen_automation]

Water pump controller only 5sec switching relay like push button on and off relay separate

[@jonasmaghanoy7297]

Woohh impressive sir. So cool. How I hope I could study deep the coding, kind'a hard for me to learn. I'll try harder to study this one. Thank you sir for making such innovative tech. ❣

[@AhmadLogs]

thanks

[@kalebhofer9709]

Thanks

[@rhingenieria6964]

the best video for sim 800l

[@AhmadLogs]

thanks

[@mehdiabedi6163]

Thanks Ahmed

[@ubaid7979]

Bhai is main pc add kar k rakhna pharega kiya programming upload kar k pc hata k power supply se used kar sakhte hai naa???? Number mil jaega to bohat help ho jaegi main bhi pakistan se hun

[@AhmadLogs]

nahi pc on rakhany ki zaroorat ni hy. but ap ko charger ki 5v pin ko arduino ki 5v pin sy connect kerna ho ga.

[@saitammali5138]

thanq so much broooo............!!!!! 100% working>>

[@AhmadLogs]

glad it works

[@shubhamubarhande2122]

Does this gsm module work on 4g sim?

[@moussaab8292]

Please, I have a GSM working on 4 volts, can it be connected to a 5-volt Arduino power supply and put a resistance to reduce the voltage

[@AhmadLogs]

it also required 2Amp burst for sending or receiving sms and making call. Arduino 5v pin does not provide enough current. I have a 5v sim800l module it works only with separate 5v 2amp supply.

[@davidacostagarcia402]

Excuse me sir, everything works great but if I add a digitalRead in the void loop the messages dont arrive, like the communication is affected. How should I implement that without affecting the serial comunication?

[@kentbinaoro9164]

This is so cool.....I wish I could see your schematic diagram sir.. it is very hard to follow ... I hope you can help me sir for my studies.🥺

[@AhmadLogs]

you may check download link.

[@glob.entertainment]

Ahmad, please, if do I need to change the sim800 function in your code to sim900 if I am using sim900. Because I'm a bit confuse. FYI, I'm using sim 900

[@oet6967]

thank you sir , i have some questions , i have sim900 and i connected every thing right , and there is a communication between gsm and arduino everything is good except the light is not turn off or on and there is no feedback sent from gsm to the sender phone as (relay has been off or off ) , what is the problem ? all i did is i change the pin of rx and tx to 7 and 8 and i change the pin of the lights please help and thank you alot note : i didn't connect relay yet , im testing in leds lights

[@AhmadLogs]

you need to check the following things. 1. power supply (check datasheet for more detail) 2. use good quality wires for tx and rx connection 3. keep power source close to the gsm module 4. make a call to gsm module from your phone and listen the tone. also checks the serial monitor.

[@oet6967]

@@AhmadLogs i have checked everything , can I communicate with u in email or any other app?

[@AhmadLogs]

you might communicate here. I am here to answer every thing related to the project.

[@dabhichandresh6128]

Sir i am using sim900 but same problem.

[@rajaduraisangari]

Sir, gsm sim 800l with Arduino relay control by agriculture motor , how to connect the CT coil for low or high Amp motor will turn off motor, need the CT coil connection diagram and code, thanks

[@chidiayoanasonye9243]

Can I power the arduino using same 5v adaptor ?

[@AhmadLogs]

there are some module in the market that works perfect on 5v. like the one I am using. best power source is 3.7v battery or use buck convertoer

[@ismailsinapli]

Esselamun aleyküm Çok işime yaradı, varlığına şükran kardeş. 👏🇹🇷 Good lock my friend.

[@mdsharifulislamsharif3545]

Hello, Please, Can you give a Arduino code that two relay 'on' only for 1 minute and 2 minutes when i send 'ON' through sim900a

[@edgardoravier5641]

Hola, como estas. gracias por el proyecto y ponerlo a disposicion. Consulta cargue los codigos pero quedan las 2 digitales en on.

[@kamalkamel7559]

good work, excellent, I have a question for you, is it possible to make a video on the pwm led variation by sms message? example to send sms led=30, the led on at 30, send led=100, the led on complete.... it's possible, i need this!! thank you so much

[@AhmadLogs]

yes it is possible. I will try it soon

[@kamalkamel7559]

@@AhmadLogs ohh, thank you my freind

[@rajaduraisangari]

Dear sir, I have two questions 1)when gsm sim 800 power on, i need to received message, because here power cut 4 times per day, 2) how to change the mobile number from SMS.

[@AhmadLogs]

1. not possible using this code. lots of modifications are required 2. kzbin.info/www/bejne/f5rLloR3grlmoaM

[@moussaab8292]

I have a problem with programming, as soon as I write pine Mode( 7,OUTPUT) the relay works without defining HIGH in the program

[@AhmadLogs]

there is just need a change in hardware. just replace your AC wiring to NC (normally closed) to NO (normally open)

[@rajaduraisangari]

Hi sir, when we received reply message, need the date and time together with notification, How to add the code in CCLK?

[@mustaphajammeh6723]

Hi,how can I integrate relay with the GSM module to send me messages.

[@rajaduraisangari]

Sir, how add the two const string phone number ?

[@amdavadinishant354]

SENDER PHONE NUMBER MEANS THAT PHONENUMBER WHICH IS ATTACHED WITH MODULE OR THAT NUMBER FROM WE MESSAGE TO MODULE

[@AhmadLogs]

the phone number that we will use to message to the module

[@rajaduraisangari]

Dear sir, 1)I need to receiving the message automatically when sim800L power On . 2) how to registered the master mobile number and how to change the mobile number with SMS, 3) can store the 2 no’s registered mobile number?, thanks.

[@AhmadLogs]

watch this kzbin.info/www/bejne/hXvGeIxqrrimatE

[@svsezhil2051]

Can we use SIM900A? If yes , can we use the same code for SIM900A.

[@AhmadLogs]

yes you can use. I use AT commands in code that will run on almost all gsm modules. that's why it will run on sim900A. but I didn't test it with sim900A.

[@DARK2SHARK]

In Sim900a not working properly..... relay wae turned on but didn't turn off

[@ricardomontiel5198]

Hello sir. How can add an other phone for receive the message. I mean that two phones receive the status of relays

[@AhmadLogs]

watch the following video kzbin.info/www/bejne/f5rLloR3grlmoaM

[@rajaduraisangari]

Dear sir, I am used the sim800L with Arduino nano board control by the two relays , Send the sms 1 to ON the First relay for motor start button , after 3 seconds time delay to cut off. Send the sms 2 to ON the second relay for motor stop button, after3 seconds time delay to cut off. This function Working is fine and reply message also fine, But I need how to check the motor last status on/ off, Pls can doing the code for me thanks.

[@AhmadLogs]

for that you need to define one more variable in the code Boolean LastState; each time you turn on or off the motor, you also update the LastState variable

[@rajaduraisangari]

@@AhmadLogs sir, pls can update the code for me thanks

[@rajaduraisangari]

@@AhmadLogs sir can I get the your email I’d?

[@shahriarrivan]

Why doesn’t it work when I unplug the arduino from my laptop and use a powerbank. If you know how to fix it please let me know. It only works when the arduino is connected with a computer.

[@AhmadLogs]

you need to step down the voltages to 4.4v and the module will surely work.

[@tajmalitha7292]

Sketch uses 7944 bytes (24%) of program storage space. Maximum is 32256 bytes. Global variables use 655 bytes (31%) of dynamic memory, leaving 1393 bytes for local variables. Maximum is 2048 bytes. how can I solve this problem?

[@AhmadLogs]

This message is not actually an error, but rather an informational message that tells you how much program storage and dynamic memory your Arduino sketch is using.

[@chidiayoanasonye9243]

Plz sir which phone number should I put in the code ? . The sim inserted in the sim800L module ? Or my personal phone number in my phone ? . If my personal phone , how can I add up to three phone ? numbers

[@AhmadLogs]

The sim inserted in the sim800L module

[@Jeggerblok12]

Modul Micro Sim800l Gprs Description: Chip: SIM800L Voltage: 3.7-4.2V ???? explanation please?

[@AhmadLogs]

i have sim800l module that works on 5v directly. I have also sim800l module that works on 3.4-4.4v. both versions are available in market.

[@AhmadLogs]

good question.

[@Techie499]

@@AhmadLogsHow can i understand the difference?? which one will work on 3.7v and which one will work of 5v, if not mentioned by seller?

[@AhmadLogs]

@@Techie499 try to test with 3.7v. a module that works on 5v it must also works on 3.7v

[@Techie499]

@@AhmadLogs I tested with 3.7v.it worked. should i test with 5v or leave that risk?

[@tuanvinh7987]

I use google translate to record these words, sorry for the inconvenience. Can you tell me about the end of the power cord? Make it so that it can be plugged in, thanks

[@AhmadLogs]

just cut out the end of the power plug

[@unknownartist2809]

How can I use it without register the number

[@marif1586]

sir Arduino programing ki koi Urdu main books available hy

[@saadelm2955]

Thanks sir.. Coool... Haw i can place an ather Led...for detect the Net

[@AhmadLogs]

use AT+CREG. if the response is 1. its mean the gsm module is connected to the network. so, turn on the led. if the response is other than 1. its mean the gsm module is not connected to the network. so, turn off the led.

[@saadelm2955]

@@AhmadLogs thanks... So much

[@mahaveerprasad8326]

Hi Sir, i am using emonlib library in this code for measuring current after that gsm not read msg

[@AhmadLogs]

hmmmm. have your gsm module working fine?

[@mahaveerprasad8326]

@@AhmadLogs yes sir

[@mahaveerprasad8326]

doaction function not working

[@AhmadLogs]

@@mahaveerprasad8326 it only works, if you send sms from the phone number that you have entered in the sketch

[@user-ri8rs8xl9j]

you're the best!

[@AhmadLogs]

thanks

[@mobilestudynk5284]

Bhai india me chalega I mean sim 800l indian network supported hai

[@AhmadLogs]

yes, it supports all gsm based networks.

[@warrenscorner]

My SIM800L stopped working because it’s only 3g. What module can I use that’s 4g or 5g compatible?

[@AhmadLogs]

sim7600

[@rajaduraisangari]

Dear sir, I need the same code but how to add the one master mobile number and how to check the last relay status ? Thank

[@AhmadLogs]

have you watch this? kzbin.info/www/bejne/hXvGeIxqrrimatE

[@syahnanification]

Use of undeclared identifier 'prasedata', 'extactsms', 'doAction', 'reply' Saya memasukan code yang anda punya. Kenapa pada arduinodroid saya ada tulisan seperti itu. ?

[@erlandrewabrasaldo3320]

Independently this code of yours work, but when I try to insert this to my project code, it doesn't work anymore. It can receive my sms but won't extract it, thus not going to process void doAction();

[@AhmadLogs]

can I take a look at your code. just upload the code to github and give me the link

[@atulpartole747]

Can I use 4g sim card

[@realexposer]

How to use with 440v ac?

[@dabbarmohsen8696]

hi where to find the application '' sim800" to install it in the Gsm and send the sms THANKS

[@AhmadLogs]

no need to install sim800 separately. sim800 code is with in the ino file.

[@klt-rms]

Dear bro, As tested with your code, everything ok.but sms is directly save to sim memory and only can send about 40 sms. after that, sms can not receive from sim.can you help me? I tested some code to delete sms from sim memory but still not ok. Below are i tested code AT+CMGDA="DEL ALL" AT+CMDA="DEL ALL" AT+CMGD=1 AT+CMGD=1,4 currently, after over sms 40 quantity, i delete with my phone and install again to sim module. Could you please help? and are there any way to update phone number by remote sms command?

[@AhmadLogs]

1. I have used sim800l.println("AT+CMGD=1,4"); in the setup() function. when I want to delete the message. I just press reset button of arduino uno. 2. what issue you are facing while using AT+CMGD=1,4 command 3. can you please explain the following statement "are there any way to update phone number by remote sms command?" are you talking about the phone number we have enter in the arduino sketch

[@F3ChannelRs3]

Hi sir, is it possible to add more sender number? or remove that feature? cause i wanna register more than 5 numbers

[@AhmadLogs]

are you talking about this? kzbin.info/www/bejne/hXvGeIxqrrimatE

[@imen4698]

Hi sir i need help My country cod is +213 Not made of tow numb There's solution for this problem?!

[@AhmadLogs]

do you test to make call using three digit code? Tell me the output when making call. AT command for making call is "ATD+Phone_Number;" test this command and tell me the output

[@imen4698]

@@AhmadLogs when i try in the monitor ,I get a question mark

[@yasserchenini3789]

​@@imen4698 مشكل مش في كود

[@kalebhofer9709]

hello sir i am from canada will this work with bell 4g network here in canada

[@AhmadLogs]

no it will not work with 4g network. you must use 4g gsm module

[@kalebhofer9709]

@@AhmadLogs so witch gsm module do you reccomend?

[@AhmadLogs]

@@kalebhofer9709 sim7600

[@wersissima15]

the SIM800L is not 5V tolerent (3.3V - ~4.4V ), even if it works, it won't perform correctly and can be damaged at any moment, chech please the official documentation of the SIM800L module

[@hamlovingprophetpisslam183]

True. It worked for few days and stopped receiving commands. I am controlling my farm irrigation with solenoid valveswith arduino, 800l n relays. I dont use sms but calls

[@AhmadLogs]

you are right

[@inlandb.villos1872]

WHAT NUMBER DID YOU PUT IN YOUR CODE A RECEIVER SIMCARD OR THE SENDER SIMCARD?

[@AhmadLogs]

enter your personal phone number. you can say it sender phone number. note: not enter the gsm module phone number

[@luvochosi3958]

I find it very interesting, I am working on a similar project, can i see your code please.

[@AhmadLogs]

In the description

[@rajasidhu268]

oo haini bhrawa code keyon murkh bnayi jana lokannu

[@filipinodiynot]

hello Sir, I tried to upload the code but no luck, it seems it is not receiving SMS. can manage to detect a call and just show ring and no carrier on serial. any help is highly appreciated.

[@AhmadLogs]

what is the led status of your gsm module

[@filipinodiynot]

@@AhmadLogs led status ok sir, AT+CMGD=1,4 OK AT+CMGDA= "DEL ALL" OK at+cops? +COPS: 0,0,"T-Mobile" OK at+cops=? +COPS: (2,"T-Mobile","TMO UK","23430"),(1,"O2","O2 -UK","23410"),(1,"vodafone","voda UK","23415"),,(0-4),(0-2) OK at+csq +CSQ: 6,0 OK seems signal is ok, im here in UK sir- thanks

[@rajaduraisangari]

Dear sir, I want same code but need to update the 2nos master mobile register with SMS, can help me to modify the code, thanks.

[@AhmadLogs]

Please wait

[@rajaduraisangari]

@@AhmadLogs sure sir, and one more thing when power off gsm we can get the notification from SMS? Take your time to can reply to me, thanks

[@AhmadLogs]

@@rajaduraisangari hmmm. I will try

[@rajaduraisangari]

@@AhmadLogs sir, how to check the all reply status?

[@AhmadLogs]

@@rajaduraisangari I have updated version for this. kzbin.info/www/bejne/hXvGeIxqrrimatE

[@panjatcharaml9683]

It's taking too more time to receive message and some time message is not received how to solve this problem

[@AhmadLogs]

It should take normal time. you need to check signal quality of gsm module.

[@panjatcharaml9683]

@@AhmadLogs yes bro but it changing frequently first few seconds it blink slowly and some time it blink faster and some time no blinking how can solve this bro

[@AhmadLogs]

@@panjatcharaml9683 I think, you need to use outdoor antenna

[@panjatcharaml9683]

@@AhmadLogs but I don't have it bro any other way

[@AhmadLogs]

@@panjatcharaml9683 you need to test it outdoor or on the roof. also checks the signal quality by using the following AT command AT+CSQ

[@republikbasecamp]

projek this am success... but versi reg am no work....

[@faroekjuthan89]

I have 2 problems and hope you have a solution 1) SMS is not being sent to my phone number. Serialmonitor gives the following message: AT + CMGR = 14 + CMGR: "REC UNREAD", "+ 31XXXX", "", "> Relay 1 off. 2) What I notice is that if i change the Phone number in the Code and upload,the old number stays in de memory,which display on de serialmonitor.Even if i reset the Arduino bord it hold the first added number.Thank you in advance for your help.

[@AhmadLogs]

1. Have you add your phone number in the code with country code? 2. send sms Relay1 off. Notice no space between world Relay and 1.

[@faroekjuthan89]

@@AhmadLogs,many thanks for your help,I appreciate it very much.The first part of the code works great,the memorylocation change every time like this on the serialmonitor:"+CMTI: "SM",28 ".But something happend when the SMS must be read out,put into the new memorylocation,extract and pass further into the code.I think in this part something go's wrong:if(cmd == "+CMTI"){ //get newly arrived memory location and store it in temp index = buff.indexOf(","); String temp = buff.substring(index+1, buff.length()); temp = "AT+CMGR=" + temp + " "; //get the message stored at memory location "temp" sim800.println(temp); } else if(cmd == "+CMGR"){ extractSms(buff); if(senderNumber == PHONE){ doAction(); I do not know any thing about programming,so i hope you will forgive me if i see it the wrong way.The code is good and i need it for my study and other peaple i help.Thanks again.

[@AhmadLogs]

@@faroekjuthan89 memory location must be change when new message is arrived like in serialmonitor:"+CMTI: "SM",28 this statement String temp = buff.substring(index+1, buff.length()) get the memory location from "+CMTI: "SM",28 mean 28 will store in temp variable then next statement temp = "AT+CMGR=" + temp + " "; - reading the sms from memory location in this case 28 then extractSms(buff); function is called to parse sms. and get the "message" and "phone number" from sms stored at memory location 28 then phone number is compare if the sms received from the phone number you have added in top of the code. then doAction() function is call to control the relay

[@faroekjuthan89]

Thank you very much for the nice explanation, I learned a lot from it. I will continue to play around with your project and hope it will work once. Wish you good luck with your projects.

[@AhmadLogs]

@@faroekjuthan89 very happy for such a nice appreciation

[@masoudjafarzadeh]

Hi Do you have any program that can save multi phones number on arduino eeprom via sms with a password Thanks of your sharing time.

[@AhmadLogs]

No, sorry. but soon I will make code for this

[@masoudjafarzadeh]

@@AhmadLogs thank you Your programs are awsome

[@AhmadLogs]

@@masoudjafarzadeh So nice of you

[@edgardoravier5641]

Sabras donde estara la falla. gracias

[@rajaduraisangari]

sir, i need the this code but same code how to add the 2 nos register phone number? last time your send the link for registered video, i try to change the code but cannot, can help to add the register numer with the same code, thanks.

[@AhmadLogs]

I will try it in future

[@rajaduraisangari]

@@AhmadLogs thank you sir

[@rajaduraisangari]

@@AhmadLogs dear sir, this week can get the code for 2 nos register mobile number , thanks

[@AhmadLogs]

​@@rajaduraisangari unfortunately not this week.

[@chidiayoanasonye9243]

Please sir can u help me write out and post the code here . I can't access it through the link . its not opening .

[@AhmadLogs]

please check the link again

[@rajaduraisangari]

Dear sir, how to change the mobile number?

[@AhmadLogs]

kzbin.info/www/bejne/hXvGeIxqrrimatE

[@sibujacob977]

Can the SIM800L support 4g sim

[@AhmadLogs]

no

[@sibujacob977]

@@AhmadLogs Does it support 3G

[@AhmadLogs]

@@sibujacob977 it only support 2g

[@ricardomontiel3267]

Hi!! i have a question . How can i delete all the msj using the phone , i know how delete all message with monitor serial but i want to delete with the phone. what have to write i have the same code that you ;) thank u for all teacher

[@AhmadLogs]

in the setup() function add the following line of code sim800l.println("AT+CMGD=1,4);

[@ricardomontiel5198]

@@AhmadLogs with this line when i write in the msg AT+CMGD=1,4 i send to number of sim 800l i delete all the msg?? I mean the msg than the sim800l has to receive and the msg send with sim800l. With this i delete all the msg including msg receive and sends msg?

[@AhmadLogs]

@@ricardomontiel5198 yes, this will delete all the message stored in sim800l memory. if you want to delete some specific message then you may use this command AT+CMGD=1 delete the sms at memory location 1. similarly, AT+CMGD=2 delete the sms at memory location 2, and so on

[@ricardomontiel5198]

​ @Ahmad Logs i have a problem . when i write this AT+CMGD=1,4 send the msj and the sim800l does´nt delete all the msj dont made anything. i sent i msj from you facebook page can you help me please

[@AhmadLogs]

@@ricardomontiel5198 first send command AT+CMGF=1 and then AT+CMGD=1,4 Unfortunately, I am unable to use facebook page now a days. so please ask any thing here

[@camcam3388]

My friend, please, if you have a device code. servo motor control by sms thanks

[@AhmadLogs]

sorry, i have not the code

[@moussaab8292]

Can control by calling the phone only without sms

[@AhmadLogs]

yes, you need to use dtmf function of gsm module

[@moussaab8292]

@@AhmadLogs I hope you will explain it to her in the future, please

[@AhmadLogs]

@@moussaab8292 I will, INSHAALLAH

[@tobiasxy1230]

Hi, which phone number is your "sender phone number"? The number, who sends the sms to the SIM800L or the number which is as a SIM Card in the SIM800L?

[@AhmadLogs]

the number which is as a SIM Card in the SIM800L

[@tobiasxy1230]

@@AhmadLogs OK thanks for the response. I placed the number there. But the relais doesn't switch. I changed the msg text for relais 1 to "LED AN" then the relais is LOW. And for the msg text "LED AUS" the Relais is "HIGH". Relais is connected to Pin 7. The Sim card ist registered into network. The red led is blinking every 3 seconds. And I have 2,4 A peak current.

[@AhmadLogs]

@@tobiasxy1230 I have connected the load to relay NO (normaly open). that's why when we send LOW the load will turn ON. and when HIGH the relay will be OFF.

[@tobiasxy1230]

Okay thanks. Should I connect the 5v DC from the plug power supply to the VCC from the arduino too? I have connect the power supply to the Sim 800l and the ground and VCC from the arduino to the relay. I think this is wrong? The relay doesn't switch if I send a SMS. The Sim 800l is registered in the mobile network. And how can I create a white list for the phone number which are allowed to switch the relay through a sms?

[@AhmadLogs]

@@tobiasxy1230 relay required more current that VCC does not able to provide. directly connect the 5v power supply to relay. just connect the GND pin of the relay to Arduino. check the video on white list phone numbers kzbin.info/www/bejne/f5rLloR3grlmoaM

[@azamjahangir3071]

Sim 800l module PTA sa resistor hota hai kia reply me

[@AhmadLogs]

ni, apko register krwana parta hy

[@moinshaikh6684]

I was feeling like I'm in a disco according to music..!

[@AhmadLogs]

this is KZbin royalty free music

[@moinshaikh6684]

@@AhmadLogs I've no issues with music, i commented to show the enjoyment i had with your video, learning as well as dancing...

[@AhmadLogs]

​@@moinshaikh6684 hahaha.... thanks you bro

[@safar24X7]

Sir plz plz sand background music link

[@AhmadLogs]

KZbin music library. Music name: Forget Me Not

[@ridwanolawale8558]

am from nigeria please i try to connect it not responds

[@AhmadLogs]

you need to power sim800l with 3.7v mobile phone battery

[@moab5246]

When I open the monitor, it comes to me (??????)

[@AhmadLogs]

this is Serial communication issue. have you select the correct baud rate from serial monitor. most of sim800l works on 3.4 to 4.4 volts. test the circuit with 3.7v mobile phone battery

[@redigjona8757]

After 40 messages my project isnt working anymore. Can you tell me anyway to solve it?

[@AhmadLogs]

use the following AT command at the end of "do_action function" AT+CMGD=1,4

[@redigjona8757]

I can't understand clearly. Can you be more specific sir please?

[@AhmadLogs]

@@redigjona8757 I have updated the code. just download the latest copy

[@redigjona8757]

Do i need to send any msg to sim800 for deleting msgs?

[@AhmadLogs]

@@redigjona8757 message will delete automatically

[@fernandohood5542]

There is no voltage translation?

[@AhmadLogs]

because my sim800l works perfect on 5v dc. strange.......

[@fernandohood5542]

@@AhmadLogs So there is lot of misinformation?

[@AhmadLogs]

@@fernandohood5542 there are many videos on my channel about sim800l. you just have a look at them.

[@hatem2561]

hey sir can you send me this program of arduino i need it .. i am a student and i need it for my finaly exam pls....

[@AhmadLogs]

code link is available in description of video

[@ahmadnurlintangsmesta_0028]

Sim 800l relay control using telegram bot, this work?

[@AhmadLogs]

telegram is banned in my country

[@chenapallireddypraveen8947]

Sir 4g sim is worked in GSM module 800l

[@AhmadLogs]

yes, most of 4g sims also have 2 functionality. it will use 2g services of 4g sim

[@chenapallireddypraveen8947]

I'm trying to on the relays but it's don't work sir, code is uploaded to Arduino and everything is fine

[@chenapallireddypraveen8947]

I'm giving relay vcc to Arduino 5v

[@AhmadLogs]

@@chenapallireddypraveen8947 have you test relays separately. how many relays you are using?

[@AhmadLogs]

@@chenapallireddypraveen8947 check voltages and current around relays using multi meter

[@dabbarmohsen8696]

Hi mister I followed the connection diagram and uploaded the code but the arduino does not receive the sms 02:31:27.728 -> Arduino serial initialize 02:31:27.728 -> SIM800L software serial initialize 02:31:31.764 -> AT+CMGF=1 02:31:31.764 -> ERROR 02:31:31.764 -> AT+CMGD=1,4 02:31:31.764 -> ERROR 02:31:31.811 -> AT+CMGDA= "DEL ALL" 02:31:31.811 -> E

[@AhmadLogs]

test your gsm module, by making call on it from your phone

[@talebsalah139]

salut j'ai un projet de arduino il se compose de Arduino nano Gsm module Battery 3.7v Breadboard 430 pts Relay module 4ch aide moire pour rialise ce projet je besoin schema et installation

[@AhmadLogs]

I will try to make it

[@talebsalah139]

@@AhmadLogs Je vous remercie.

[@talebsalah139]

Jous changer le batterie 3.7v au Buck Converter

[@AhmadLogs]

@@talebsalah139 No problem, only adjust the voltages of Buck Convertor (4v is best)

[@AhmadLogs]

@@talebsalah139 so nice of you

[@anildolage9371]

Onde baixo essa programação?

[@AhmadLogs]

o link está disponível na descrição do vídeo

[@anildolage9371]

@@AhmadLogs vc concegue me enviar a programação por email? [e-mail]

[@rahmanihamidou6093]

Hello, super You can send me the code for sim800l .

[@AhmadLogs]

check download link in the video description

[@rahmanihamidou6093]

Where i check it? You say in vidéo description I have sim800l and i need code ,how i do it , Went sending message to start for exemple relay or lamp Thank you.

[@AhmadLogs]

@@rahmanihamidou6093 github.com/ahmadlogs/arduino-sim800l-relay-control

[@shaniteach1166]

Super Dear i buy this project plz conct me

[@AhmadLogs]

want to buy from me?

[@GP_BALAN1423]

Sir I can control any one relay by making call Example:2ring to on the relay and 5 ring to off the relay Sir you can make the code it possible or not.

[@AhmadLogs]

yes it is possible and very simple

[@GP_BALAN1423]

@@AhmadLogs how?

[@AhmadLogs]

@@GP_BALAN1423 when we call to sim800l. you will receive "ring" in serial monitor. count the number of rings from serial and perform required action according to number of rings

[@GP_BALAN1423]

@@AhmadLogs ok sir ❤️

[@ALLINONETeam]

Please give me circuit diagram pdf ☺️

[@AhmadLogs]

I dont have circuit diagram for pcb.

[@ALLINONETeam]

@@AhmadLogs bro how many cost they making?

[@AhmadLogs]

@@ALLINONETeam this is very cheap solution. $15 for hardware parts. other hardware configuration and software cost may vary according to someone requirements

[@elvisryanmillan2843]

atchup

[@zebafatma3683]

Please help me

[@AhmadLogs]

what is the error

[@azamjahangir3071]

Asslam o alikam bhi

[@AhmadLogs]

w.slaam

[@azamjahangir3071]

Register kar wana ki fee kitni hai sim 800l module

[@AhmadLogs]

@@azamjahangir3071 same as you register your mobile phone

[@AhmadLogs]

@@azamjahangir3071 not sure. meny free me register kerwaya tha bohat pehly

[@azamjahangir3071]

Thanks

[@zebafatma3683]

Nihi hoa

[@AhmadLogs]

what is the error

[@aminebelgacem8906]

can i have the code source

[@AhmadLogs]

yes source code available in description

[@aminebelgacem8906]

@@AhmadLogs thank you, but can i use this code for SIM900A??

[@AhmadLogs]

@@aminebelgacem8906 I think it will work because I am using simple AT commands in the code that are common in all gsm modules. but I will not test the code other than sim800l. you may test it and also dont forget to give me the feedback. thanks

[@aminebelgacem8906]

Can you help me in code source of controlling 2 relay using text message?

[@AhmadLogs]

@@aminebelgacem8906 yes of-course. tell me what do you want

[@TahirElectronics]

سر جی پلیز پلیز اپنا ای میل یا واٹس ایپ نمبر دے دیں مشکور رہوں گا

[@manmangy]

Kindly Shut off this horrible background so called useless music. Give us some explanation instead

[@chidiayoanasonye9243]

Plz sir which phone number should I put in the code ? . The sim inserted in the sim800L module ? Or my personal phone number in my phone ? . If my personal phone , how can I add up to three phone ? numbers

[@AhmadLogs]

The sim inserted in the sim800L module

[@bulesky3401]

Hello We can control 8 relays؟

[@AhmadLogs]

yes, you can control 8 relays easily. if you have some issues you may ask.

[@bulesky3401]

@@AhmadLogs Thanks in the program fertilizer, what should I change for 8-rail control?

[@AhmadLogs]

@@bulesky3401 you need to add 8 channel relay module to arduino attach two pins of the relay module like in1 and in2 according to circuit diagram. and other 6 pins from in3 to in8 to any empty pins on arduino. and then you need to do some changes in code. if you know a little bit about the programming you can easily modify the code according to your need

[@bulesky3401]

@@AhmadLogs Thanks