Circuit for Buzzer on battery low voltage and gsm module to have sms on mobile

[Mani Baba]

I need a circuit which is actually a battery tester and produce alarm/buzzer on battery low voltage and also give an sms alert on mobile that your battery is dieing...Can anyone help me

 

[alexxx]

I need a circuit which is actually a battery tester and produce alarm/buzzer on battery low voltage and also give an sms alert on mobile that your battery is dieing...Can anyone help me

I suppose you will use an MCU right?
You need to measure the voltage of the battery with an A/D converter. While this voltage is smaller than a fixed value, you will drive the buzzer to produce sound. In the transition between normal and low battery voltage, you will send an sms.

A couple of helpful references on sms:

https://www.smssolutions.net/tutorials/gsm/sendsmsat/
https://www.developershome.com/sms/