ESP32 SIM800L | Send and Receive SMS to Control Relay

Hi Ahmad, I did step by step the project, but when I send "Relay1 on" nothing happens and in serial monitor I can see: AT+CMGR=36, +CMGR: "REC Unread", "+my phone number", "", "date, time", Relay1 on. Could you advise what type of error is it? Have you faced with the issue?

hey rather than AC power would using just the relay be able to remotely power off a PC or a TV(something with a soft off button) ?

can i use the code in esp8266

if I want to try to send a message from esp32, does the command in the void loop use this?

sim800.print("AT+CMGF=1\r"); delay(1000); sim800.print("AT+CMGS=\""+PHONE+"\"\r"); delay(1000); sim800.print(text); delay(100); sim800.write(0x1A); //ascii code for ctrl-26 //sim800.println((char)26); //ascii code for ctrl-26 delay(1000); Serial.println("SMS Sent Successfully.");

Hi. I really like your project but it's not working for me and I want to ask you for help. Esp32 receives sms but nothing else happens. ESP writes in serial monitor: +CMTI:73 AT+CMGR: "REC UNREAD", "my Phone number", "date", "time" relay1 on OK

hello dear
Sorry I had a question I want to control an electrical device through esp32 and GSM800L by phone my code and things all worked well the first time but then sent a delay complaint the problem is with GSM or esp32 if you can help me I would be grateful

I try it so many times but is not replying me everytime i send sms and nothing happens on relay huhu help me

Hello. I want to add DHT 11 temperature sensor in this code, but I couldn't, can you help me?

nice projekt but after power los i need to reset the esp 32 board. is there a way to solve this problem

its ok, but i need SIM800L with esp32 connected with wifi relay for distance light

Excelent! One remark: For me the "senderNumber = buff.substring(0, 13);" was too short, my phone number has 14 digits.

can i use the code with gsm sim900a ?

No words man.. you did every possible things with sim800L. and you provide openly.. salute to your efforts. we understand how much time you spend to doing this... thank you...

I'm getting this type of error:

invalid conversion from 'int' to 'SerialMode' [-fpermissive]

Hi
I got this eror 👇

Use of undeclared identifier 'parseDada'
Use of undeclared identifier 'extractSms'
Use of undeclared identifier 'doAction'
Use of undeclared identifier 'Replay'

Please help me, i need to fixed for my project

Help!
I don't get a reply message from the sim800L module.

I have used a 3.7V LiPo Battery with the SIM800L.
ESP32 is powered by the USB port.
Red light is constantly blinking on the sim800L with 3 second intervals. Both LEDs on ESP32 are turned on.
I am using a jazz sim.
I am using the helical antenna that came with the module.

Great video, Can you know if the module works with thingsmobile SIM?

Can we do the same with nodemcu and gsm800

Nice video esp32 communicate with sim 800 but relay output not working plz help me relay not on or off