hi,
OPA's operational amps/comparators etc

Look at this rough draft option using the Arduino ADC to sense the 3 voltage levels.
Needs some minor suppression and filtering caps.

If it looks interesting, we could work on the Arduino Sketch.
E

BTW: Assumed a 1k for EOL for testing only

 

hi bend,
This is a simple demo Sketch.
I used a 10k trim pot for the ADC input, for testing.

Looks OK.
E

// Alarm bend94- A  30/10/21EG

int AlarmPin = A0;    // select the input pin for the potentiometer
float AlarmValue = 0;
float Vadc =0;

void setup() {
   Serial.begin(9600);
   Serial.println("Ready");
}

void loop() {
  // read the value from the sensor:
  AlarmValue = analogRead(AlarmPin);
  Vadc= 5 * (AlarmValue/1024);
  Serial.print(Vadc);
  Serial.print(" ");
  Serial.print(AlarmValue);
  Serial.print(" ");
  if (Vadc >= 4){
    Serial.println ("Shunted");
  }
  if (Vadc <= 2){
    Serial.println ("Window");
  }
  if (Vadc >= 2 && Vadc <= 4){
    Serial.println ("Normal");
  }
  delay(2000);
}

 

hi thank you for your code.
i will study that
My project will be designed like this :
Arduino Uno connected to a raspberry pi through usb.
Arduino sketch will loop on reading the analog inputs and sending the result on the USB port

Raspberry will be installed with freepbx to be able to manage a 4GDevice key (to send sms)
Raspberry will also run a python code in background , reading USB from uno, manage alarm on/off and sms if needed.

Last , i have to design a UPS like with a battery to be able to go on if power failure.
If you have an idea for this ups , let me know
i posted another subject on this on the forum
best regards

 

You can either use a voltage divider circuit or buck converter or step down transformer to step down the voltage from 12V to 5V. Then you have to do the necessary calculation to get the original voltage reading inside your program.

 

hi thank you for your code.
i will study that
My project will be designed like this :
Arduino Uno connected to a raspberry pi through usb.
Arduino sketch will loop on reading the analog inputs and sending the result on the USB port

Raspberry will be installed with freepbx to be able to manage a 4GDevice key (to send sms)
Raspberry will also run a python code in background , reading USB from uno, manage alarm on/off and sms if needed.

Last , i have to design a UPS like with a battery to be able to go on if power failure.
If you have an idea for this ups , let me know
i posted another subject on this on the forum
best regards

RPi + FreePBX seems to be like using a cannon to swat a fly if that’s all it is going to do. There is no problem having an Arduino compatible board do all of the functions you’ve mentioned. Or, you could get a board that uses MircoPython if you want to program in Python and still do it all with the MCU and a GSM module which will be able to send SMS using simple serial commands.