Tutorial: How to use SIM900A to send SMS, Control Relay by SMS, Call and Hang Up Call with Arduino

Toppppp

Thanks for sharing. I have tried the project but I'm getting an error message at the end of the serial monitor. What could be the problem? Below is the monitor response:

Initializing....(May take 3 seconds)
Attempting to open comm with ATs
---> AT
<--- OK
---> ATE0
<--- OK
---> ATE0
<--- OK
---> AT+CVHU=0
<--- OK
---> ATI
<--- SIM900A R11.0

OK

---> AT+CPMS="SM","SM","SM"
<--- +CPMS: 6,50,6,50,6,50
FONA is OK
---> AT+GSN
<--- 864230021082434
SIM card IMEI: 864230021082434
FONA Ready
---> AT+CMGF=1
<--- OK
---> AT+CMGS="+260953555784"
<--- ERROR
Failed

Patulong nman po sa research project nmin about Arduino. GSM home security system

Sir showing me <<Content not supported>> please help

Sir how about if I connect with Arduino Mega?? How to change the code ??

Sir can u make a video on sending ussd command to sim900a and it will send to your phone its remaining load balance?

Network light never turns on whats the issue?

hi will this work in canada with bell 4g network

how to connect microphone and speaker for answering phone calls?

Serial monitor keep saying couldn't delete sms, can you help me ?

helllo can i ask.

Code not found

Code not found

Do I really need Dc-DC converter for my GSM module? It can already receive, send sms and call without DC/DC converter.

Hi this project is very well......but there you used 9v 2A adapter right.....but can I use 12V 2A adapter and step down the voltage to 5V?????

what is the use of single channel relay?

step up working or not ?

Can I use same sketch for sim800l?.....plz reply bro

Hi sir, the serial monitor states that 'Couldn`t find fona'. We use same arduino just like you. Please help us

Hi sir please help us! We use the sent sms only so we delete call and hangup in the code. But, the code states that "serial port not selected". Why?

can we replace sim900a with sim800l ?!

Super I going to try this project So you should help me to do further

Is it a must to do the step down module?

I use sim900a with PS 5v 2amper but the led is blinking 1second, and the network can't get the signal. Please help .?

i do not have (DC-DC cinverter) to connect between sim900a and arduino what i can do ?

subscribed!!! yeah

Hello sir, can we use batery instead of using that adapter?

Why need single channel 5v relay module? What happen if not use it?

How to design a circle gsm sim900a Infrared Object Detection Sensor and arduino to To send a SMS on the mobile
Please reply and help

Help me please your contact mob no, My contact no is 7004011101 please call.

sir help me, im got this at serial monitor 'Couldn`t find fona'

hello sir I fallow you video 100% but my gsm900A still blinking ..continually ...and Cant work with your tutorial ..could tell me what to do..

Thank you for sharing this tutorial, its great! I already subscribe your channel. Can you help me to my project on how to replace phone number without re uploading the program to Arduino.

Sir plz help
Phone to send sms, But not show serial monitor

please somebody help me

can i use 4g sim? i read article that it only works on 2g sim, not working on me.
registed promo for text is working? or need a regular balance. TIA

Thanks for sharing, it really useful!