DIY Ultrasonic pest repellent device for 10 USD / cheap and effective 40kHz ultrasound bugs repeller

[@hussainalsayegh5270]

Thanks

[@bloodless9469]

I see the greatness of your project. I want to make one but I will also connect it to blynk(IoT). From your circuit, I simplified it using ESP32. So I only use ESP32, Pam8403 and also the ultrasonic transmitter from HC-SR04. For the ESP32 I used the DAC1 and DAC2 pins. But I found a problem, I tried to test the signal range using the HC-SR04 receiver but no pulse came in. I don't know where my circuit went wrong. Would you be willing to provide a contact that I can contact so that I can explain in full and also consult with you?

[@domingoderivas8410]

Hola ,cual es la frecuencia mas efectiva para ahuyentar a los murcielagos ,¿ hay algun producto comercial que haya dado buenos resultados ? Gracias

[@twocyclediesel1280]

I love bats. We need them, one bat can eat 10,000 mosquitoes a night. They’re getting more rare as we destroy their habitat. Do they really bother you?

[@mikroelektro]

Great work 👍👏. Can you provide a link with a good quality ultrasonic transducers and PAM. May be a link for everything in your components. Thanks alot 🙏

[@justanengineer5599]

look on aliexpress, the 40KHz transducers are supercheap. you can buy 50 of them for 20usd

[@MrDroneinthesky]

Great work. I want to build one. Can you add an option of lcd with this setup which display some thing linke secure or jammer is on

[@justanengineer5599]

you may just attach LED diode to the board to indicate that jammer is on. There is no need to attach LCD

[@roccobooysen3611]

How many speakers can be connected to the device. I’m am thinking to buy a off the shelf unit and adding some speakers to that while I build a few of these.

[@justanengineer5599]

depends on amplifier module used. If you use PAM8610 (12v required for this module) instead of PAM8406 / PAM8403 then you may attach up to 80 transducers - 40 per audio channel

[@roccobooysen3611]

@@justanengineer5599 is there a range limit placing the transducer “pods” from the controller? I am thinking to create a bunch of the “pods” and placing them outside below my soffit pointing down around the perimeter of the house. Not sure if the length of cable connecting them will cause a issue

[@justanengineer5599]

you will need thicker copper cables from audio amplifier module. You can always use coaxial cable from AD9833 module to PAM module and place PAM module nearby transducer panel. You may also attach many PAM modules inputs in parallel to AD9833 module audio outputs and connect as many transducers as you wish like hundreds of them. Then the jamming efficiency will be outstanding

[@roccobooysen3611]

@@justanengineer5599 thank you so much for the continued feedback, it has been very helpful especially since I know almost nothing about electronics. I assume I have to have a separate power supply for the Pam vs. AD9833. I thought about using 12v as the input source with a step down regulator, have 2 voltage circuits, one 12v (for the PAM)and the other 5v (for the AD9833). Does this make sense?

[@justanengineer5599]

yes. This is exactly what you should do : a step down voltage converter 12v-5v for arduino and ad9833 modules and powering PAM module from 12v directly

[@jankowalski3293]

Bardzo fajny filmik. Będzie to działało na szczekające psy?

[@justanengineer5599]

na szczekające psy polecam zagłuszacz mikrofonów na 25KHz to jest częstotliwość która idealnie na nie działa. Na moim ostatnim filmie widać o co chodzi -edit- Sprawdziłem na kotach i psach sąsiada. Sp....lają w popłochu zdezorientowane po włączeniu tego urządzenia. Działa na nie z 30 metrow. Szczerze nie spodziewałem się aż tak dobrego efektu. Sąsiad się obraził i schował swoje zwierzaki. Chyba już mnie nie lubi...

[@josephsoucy9543]

Very interesting,, but what is the effective distance of the output of these? What I am looking for is a barking dog deterrent, so how far can this output be projected?

[@justanengineer5599]

that depends on the audio amplifier stage that you use. The small one in this design has 2x3watt while you may want to use PAM8610 module which is 2x15Watt. The bigger version will give you 50 meter range or more

[@magiconmlr]

Hi sir, I have assembled one by using NE 555 timer ic and set to 40khz frequency... I have used 10nos of ultrasonic transducer each 5 for channel with PAM8403 audio amplifier... actually I tried for mosquitoes and there is no effect on that .. Please assist what changes I have to do...

[@magiconmlr]

Hello sir, Waiting for your reply... please

[@justanengineer5599]

did I mention to use NE555? I think no. In my video there is special waveform that drives the transducers, the one that is used by mosquito female

[@magiconmlr]

@@justanengineer5599 Extremely sorry sir., I will assemble this as per your guidance... thanks a lot

[@magiconmlr]

Hi sir, I have assembled the circuit and programmed your code also but there is no effect on mosquitoes... please assist for any changes...there are two tones which is heard in the transducer...

[@magiconmlr]

Eagerly waiting for your reply please sir

[@sebasscorrea]

Can this be modified to make it work as anti barking device?

[@justanengineer5599]

of course. it works this way from the start. Pets will not stand this sound for a long time

[@PETIKTV]

@@justanengineer5599 was it tested??

[@justanengineer5599]

see my short vid with the cat

[@udaranuwantha5004]

Dear sir plz explain your calculation parat ? How to selected this values ? Plz help me

[@justanengineer5599]

Hello. I am using Libreoffice Calc for this purpose. Please open this file with Libreoffice : github.com/mcore1976/pest-repellent/blob/main/waveform-calculations.ods there is a calaculation with use of SIN function that derives 32 samples from 0-32 range. If you need higher frequency , the number of samples has to be lower. If you want lower frequency the number of samples/values has to be higher. I am also using osciloscope to validate the result frequency of the design.

[@kumarasinghearachchigesena5950]

Dear sir, I want to create an ardiuno based pest repellent device. I kindly request you to explain it in the appropriate circuit diagram

[@justanengineer5599]

hello, all informations are here : github.com/mcore1976/pest-repellent and the circuit diagram is here github.com/mcore1976/pest-repellent/raw/main/pest-repelent-device.png

[@mikroelektro]

​@@justanengineer5599 thanks for your answer. I could see the list in GitHub. What i mean is if you have a link to buy the transducer.

[@johnumali5014]

Does this require programming? Thank you

[@justanengineer5599]

yes, you need to upload the program to the chip (flash ATTINY chip) - here is the info how to do it kzbin.info/www/bejne/bZzPmKyEr79liqs

[@johnumali5014]

Thank you. another question can this be mixed with 25khz ultrasonic transmitters to have both 25khz and 40khz frequency

[@justanengineer5599]

Yes it may be mixed but you would have to modify the code to include pulses for 25kHz because it is doing around 40kHz now

[@johnumali5014]

I see. Thank you engr!

[@johnumali5014]

I see. Thank you engineer! But can this 40khz be adjustable into different frequencies?

[@rickkirby65]

How do dogs, cats, and other animals react to this?

[@justanengineer5599]

dogs and cats are sensitive for 25kHz but this is 40kHz based so they ignore it. Others like f.ex. rats can hear and are susceptible www.lsu.edu/deafness/HearingRange.html

[@ToddWilliams91360]

@@justanengineer5599 what does "like f.ex. rats" mean? Maybe that's a typo?

[@twocyclediesel1280]

@@ToddWilliams91360 I think it’s “for example”?

[@twocyclediesel1280]

@@justanengineer5599 So if I make the recording jammer using the 25khz ultrasonic generators, I should keep it off around my dogs? I don’t need it around home of course but just curious.

[@hyperlapsevideosofcebu4283]

@@ToddWilliams91360 i think that is shortcut for "for example"

[@dawidaz]

Oglądałem twoje Video o sim7000. Czy byś mógł mi pomóc z esp32 i sim7080. Esp32 nie odczytuję nic z sim.

[@justanengineer5599]

Opisz dokładnie problem. Czy komendy AT nie działają w ogóle czy tylko jakies konkretne?

[@dawidaz]

@@justanengineer5599 jak sam sim7080 podłączę przez USB do komputera i putty to sim serial port to wszystkie AT komendy działają. Jak podłączę sim do esp32 i wrzucę przykład simple_test z biblioteki tinygps to mi pokazuje ze nie ma połączenia i zobaczyć czy jest wszystko dobrze podłączone. Ma rx z sim podłączone do tx(17) w esp i tx do rx (16) Sim a.aliexpress.com/_mOWZA8H Esp www.amazon.com/dp/B07QCP2451/ref=cm_sw_r_sms_awdb_imm_PVY8DWQ3DS8R9E89NE46?_encoding=UTF8&psc=1

[@justanengineer5599]

Powody mogą być dwa - albo biblioteka słabo działa z tym modułem ( utyka gdzieś na pierwszych komendach AT) albo jest problem natury elektrycznej (poziomy sygnału na wejsciach) ewentualnie nie zgadza się prędkość lub parametry portu szeregowego na płytce esp32

[@udaranuwantha5004]

How to program the chip by arduino ?

[@justanengineer5599]

I don't think it is possible with Arduino to prpgram ATTINY85 but it is possible with cheap 2$ USBASP programmer - see my other video kzbin.info/www/bejne/bZzPmKyEr79liqs

[@johnumali5014]

hello engineer, can i code this using arduino ide?

[@justanengineer5599]

hi, unfortunatelly no, because the design uses resistor ladder that is not available on the arduino board. If you are thinking about flashing the chip ATTINY85 using Arduino IDE , there are some methods like this one here www.instructables.com/How-to-Program-an-Attiny85-From-an-Arduino-Uno/?amp_page=true

[@johnumali5014]

@@justanengineer5599 thank you and which part of the schematic did you put the led and the resistor for it?

[@justanengineer5599]

unfortunatelly I did not put any LED on the schematic. If you wish to use it you need Led and 470 Ohm resistor connected in serial attached to GND/VCC. I also suggest to use TPA3116D2 module as an amplifier unit instead of PAM8403 module. It has 10x more audio power and will work perfectly for bugs

[@johnumali5014]

@@justanengineer5599 thank you but can I TPA3116D2 using the same code?

[@justanengineer5599]

yes. you can use tpa3116d2 with the same source code

[@udaranuwantha9273]

Can you give me the program code

[@justanengineer5599]

github.com/mcore1976/pest-repellent/blob/main/main2.c

[@udaranuwantha9273]

How to code upload the chip? What is the steps of uploading? Plz help me

[@justanengineer5599]

you need USBASP programmer, some colour cables and Linux PC or Windows PC with AVR-GCC and AVR DUDE installed. I am explaining all of this here : kzbin.info/www/bejne/bZzPmKyEr79liqs

[@salilmahadik9396]

Does it repel mosquitoes??

[@justanengineer5599]

Yes it should repel mosquitoes quite well

[@magiconmlr]

Did you check on mosquitoes.. what is the result...