Tutorial: How to use SIM800L to send SMS and control relay by SMS, 100% Work, Arduino Code Given

[@vincentgrett2855]

Whilst the DC/DC converter to power the SIM800L is a nice touch, for simplicity connect the 5V pin of the Arduino via a resistor to the base of an NPN power transistor, the collector to the external 2A power supply and the emiiter to the SIM800L power input. Since high current is only intermittent the transistor should not have time to overheat so long as it's happy to take 2A.

[@mybotic_tech]

great explanation!

[@kamugishaalex2877]

I wish all innovators be smart like you to , to give codes and circuit diagrams

[@mybotic_tech]

lol, i am not smart, i am learning and sharing

[@erik.landen]

Thanks for this tutorial! I used it to make my heater in the car turn on/off and up/down in heat with som modifications. Great help, thanks again!

[@mybotic_tech]

great to hear your project work! thanks

[@zamaxshariiytopnasheeds2546]

For what purpose need this just sending messages?

[@abolfazl3393]

Hi,thanks for the video. I want to make this project. But I want to make it in a way that it can check the relay condition and then send a sms to the number. And then you can send an sms to turn it off and on. Or something like a code that you can send to the module and then the Arduino checks the condition of relay. And then base on the condition commands the module to send an sms and tells you that the relay is on or off. Can you help me?

[@jaozinasd]

You guys got to use wider wires to conect the SIM800L, he uses too much current and a regular jumper cant supply it unless the signal is excellent.

[@phinamalaka3219]

Hi sir My GSM Module sim800l is always blinking every 1sec and am using 3A power supply, should that be the problem?

[@mybotic_tech]

no signal detected, try go to outside and test it

[@jelleseelig8681]

I have a problem ...my module is blinking every second ...I’ve connected it with a Buck converter (4,1V) to my Arduino uno. It’s answering on AT with OK and on AT+CCID with the mobile number on AT+CSQ with 14-17 but it won’t connect to the net ...can somebody help me?

[@mybotic_tech]

try check the credit of your sim card. And try to put under sky to get signal easily.

[@snehankitchikhalekar1973]

Hello sir my gsm 800l module always blinking in 1 sec , i was also waited for 1 hours but still it blinking repeatedly in 1 sec period PLZZ help sir is there any solution 🙌

[@mybotic_tech]

it means detect no signal, maybe power problem (at least need 2A power supply), also go to outdoor test it

[@shrigatty1278]

www.google.co.in/amp/s/readyeeeprojects.wordpress.com/2020/02/20/gsm-based-motor-controller-with-3phase-detection-using-atmega-328p-and-sim800l-modulegerber-filecode-included/amp/

[@ilkeraykut7064]

@@mybotic_tech yes,I have same problem too.

[@ilkeraykut7064]

@@mybotic_tech I use ESP32 instead of arduino with Arduino IDE.As I said led blinks in 1 sec.When I send AT+CREG? or AT+CMGF? ,I get ERROR response(this sim card of my phone) ,when I use another sim card (line is not active. so I could not send message to my phone.with this sim card I can get OK response from many AT command)I do no get ERROR response.What might reason be?

[@musicdispensary8035]

@@shrigatty1278 Sir i need phn call then press 1 motor is on and feedback sms .

[@robosale]

I have a wire of 800 l gsm. The module is not working. The circuit connection is in place. the module is working. only sms and phone are not coming. the sim card is not working and gives an error. IT commands are also not working. Please help me.

[@himanshubhaskar6631]

Why didn't you use voltage level shifter/resistance Voltage divider from 5V to 3.3V while sending to RX of Sim800L module, doesnt it will damage the Module?

[@mybotic_tech]

signal no problem, power supply need to take care

[@srinivassunkari7556]

Hi Sir in the place of ardrino uno we can use nano please reply to

[@mybotic_tech]

same connection with arduino uno

[@srinivassunkari7556]

@@mybotic_tech sir i ask for nano is it same connction

[@srinivassunkari7556]

sir in the place of conecting to laptop can we connect to battery after codeing

[@mybotic_tech]

@@srinivassunkari7556 hi, yes, the connection same

[@srinivassunkari7556]

@@mybotic_tech thank you sir

[@Ala-bo4xq]

Hello, I wanted to ask If we use the sim800i module, can we use Bluetooth headset?

[@mybotic_tech]

not sure for it, sorry

[@jairamvutukuri8520]

In how many numbers we can add in gsm module means to make a call at one click on gsm module

[@mybotic_tech]

you can add as many as you need inside your code, but you may only call a number in a time

[@pookoye]

does this accept the RELAY_ON command from any mobile phone or the sender number to be added in the sketch? this helps in case the sender's mobile has signal issues

[@mybotic_tech]

Both also can, can set inside the code

[@jcsilva.26]

@@mybotic_tech can you please say here to put the mobile phone. Is possible to after say 2 seconds the relay turn of?

[@mybotic_tech]

@@jcsilva.26 yes, can, need to adjust the code inside digital write(relay, Low); Delay(2000); Digital write(relay, high) Above example only, syntax may be wrong,

[@jcsilva.26]

@@mybotic_tech how thanks. Here I can add the number that commands the relay (i only want 1 number to be possible to make the relay work)

[@mybotic_tech]

@@jcsilva.26 yes, can also, everything is coding

[@iktcom3554]

Waou tre cool

[@mybotic_tech]

thanks

[@upullakmal6123]

continued send the push button command, that's why

[@mybotic_tech]

you means push the button without release?

[@proximacentauri3916]

why did you use 2 power supply? one from your laptop by USB cable, the second one from AC current by DC jack. does using power supply from laptop isn't enough?

[@mybotic_tech]

the usb power supply not enough for gsm, need to use adapter minimum 2A for gsm

[@mybotic_tech]

one supply from adapter enough for arduino and gsm, the usb i attach is for serial monitor

[@proximacentauri3916]

thanks i have followed your tutorial and it works like a charm! the supply voltage i have been using is 4.2v

[@mybotic_tech]

great! thanks for your feedback

[@sanjaybansal8265]

most of the SIM800L GSM Modules available in the market do not work.

[@mybotic_tech]

May be you can try sim900A

[@pookoye]

Is there any AT command for sending SMS to the SIM address book?

[@mybotic_tech]

You may refer here simcom.ee › SIM900PDF SIM900 AT Commands Manual_V1.11 - simcom.ee

[@samuelquartey4019]

what are the specifications for the sim card for this project ?

[@mybotic_tech]

not so sure, we just using normal sim card to run it. i think should be no problem all most sim card

[@RideWithAnthony]

Can i use to control my scooter on and off?

[@mybotic_tech]

can, no problem, need to add scooter driver to control

[@RideWithAnthony]

@@mybotic_tech can you show me ?

[@mybotic_tech]

sorry, i dont have driver foe scooter...

[@RideWithAnthony]

@@mybotic_tech I can get it let me know maybe we can chat

[@inspiredvalue]

Green LED is not activating of relay module then how you are saying relay is activated? Relay is not changing the STATE. Reply!

[@mybotic_tech]

green led is behind the wire, but it really activate

[@inspiredvalue]

@@mybotic_tech But mine is not activating for the same wiring. What to do? I uploaded the code you provided, without any changes. Please.

[@foudaarist1558]

@@mybotic_tech hi sir. What could be the probleme when the system is not activating the relay ? i used the same code and wiring. I waiting for a response please

[@arahanthjain8576]

@@foudaarist1558 same my relay is also not working after same coding. plz respond

[@osmerromero4606]

Could you tell me how to buy a phone number recorded in the SIM phonebook with the AT + CPBF command, or one that will give you a result, please

[@mybotic_tech]

i think better save the number in sd card, and read out the number from sd card, more convenient, sim card need to insert back to phone to change phone book and phone book can have a lot of number

[@Datablocker]

I used eeprom to save phone numbers

[@osmerromero4606]

@@Datablocker hello, How can I use the eeprom, to save the numbers and then the system looks for them there, please could you guide me with that I am attaching my email [e-mail]

[@jagar1581]

Hello bro can u reply me pls compile time error softwareserial.h use of deleted function.

[@mybotic_tech]

compile time error normally is related to port, it may due to not proper disconnect the usb. you may restart PC and try again

[@malikjualan1750]

why relay not respone when i pull out usb cable ?

[@mybotic_tech]

It may due to power supply problem. You may check the board's power supply which from the DC jack. Make sure the power from DC jack is in range 7v to 12v. Hope this help. Thanks

[@mehulyadav8954]

sim.println("AT+CMGS=\"+91xxxxxxxxxx\" "); i dont want to write this. i want to write mobile number on serial monitor in arduino and on that number, i want to send message. how can i do?

[@mybotic_tech]

you need to use serial.read(), you may study this

[@tokitahmid6641]

thanks

[@mybotic_tech]

thanks

[@jahangirali6150]

my Question is whose number write in the code (String number = "+xxxxxxxxxxxxx";) that are insert SIM in module SIM 800L or other On which we receive message or call

[@mybotic_tech]

the number you can set by yourself

[@jahangirali6150]

​@@mybotic_tech thanks

[@lokeshimmandi]

Can we use 4g Sim in gsm 800l?

[@mybotic_tech]

hi, that we never try before, but should be ok, if too slim, put some paper on it. 😅

[@slbots]

great job bro here is my video @W78o

[@mybotic_tech]

thanks

[@muhammadabdulmalik3379]

Hello, why program not running when i plug off usb cable?

[@mybotic_tech]

when using DC jack, the power supply need in range 7v to 12v 2A. what power supply you use?

[@muhammadabdulmalik3379]

I using power suply 12v. Will this program run when it does not open the serial monitor? because I will put it in the car

[@mybotic_tech]

your arduino turn on?

[@muhammadabdulmalik3379]

@@mybotic_tech yes. Using power dc 12v

[@alexandrpavlov4474]

@Utkarsh Alset try to make your computer go to sleep after first sms are OK, then pull usb out. While power supply is stable, all works in my case (also SIM800, but code is different)

[@Rajesh.0143]

Good Morning bhaya...... I have a project, Am work a one small company. I need GSM Module board with 12Relays. We have to Control this with mobile. 1st Relay-----Generator start Relay 10sec need to close. 2nd Relay------Generator Off Relay 10sec need to close 3rd Relay-----Generator suplay on need close our timings. And remaining Relays 4th Relay----- If 230v Mains Fail we have to get Message/Mains Fail Alaram, if Mains Power Available / Mains Power Restored. 5th Relay------If 230v Generator ON we have to get DG ON Message, If DG Stop / DG Stop message. 6th Relay------If 230v Load suplay Available we have to get Power Issue clear message, If Load suplay not available we have to get Power Issue.

[@Rajesh.0143]

Is this possible

[@mybotic_tech]

possible, can do

[@Rajesh.0143]

@@mybotic_tech please shear your mail ID

[@Rajesh.0143]

@@mybotic_tech please make a video

[@bhavdipkatariya5219]

sourcode isn't open. how can i get this code.?

[@mybotic_tech]

www.instructables.com/id/How-to-Use-SIM800L-to-Send-SMS-and-Control-Relay-b/ you may download the code from the link

[@iremarjosephamplayo7830]

can somoen answer me. my serail monitar print "???????" all the time?? how can i fix it?

[@mybotic_tech]

may be your serial baud rate set wrongly?

[@iremarjosephamplayo7830]

@@mybotic_tech i missed the ground to arduino hehehehe

[@aniszed3641]

How to send an SMS to Phone Number in Current Memory ?

[@mybotic_tech]

phone number can be set inside the code

[@aniszed3641]

@@mybotic_tech thank you for your reply ,Is there a way to send an SMS alert to the numbers stored on my SIM's Phonebook instead of reading them from the code?

[@mybotic_tech]

i never explore this before, but i think can do. need to explore the AT command which can access the sim card memory.

[@aniszed3641]

@@mybotic_tech thank you so much

[@mybotic_tech]

@@aniszed3641 welcome and thanks

[@srinivassunkari7556]

Please sir

[@mybotic_tech]

ady reply, please check

[@rverm1000]

Waste half the video showing nothing useful

[@mybotic_tech]

Yes