I pretty new to the Arduino. I am working on project that find the power by reading your

closed as off-topic by Juraj, VE7JRO, sempaiscuba, MatsK, gre_gor Feb 19 at 19:14

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  • Why would you want to subtract it? Do you maybe want to sum / integrate it over time to get total energy consumption? – Maximilian Gerhardt Feb 18 at 19:47
  • I have this fourmal S=(V2-V1)/(P2-P1) – Abdulrahman Feb 18 at 19:54
  • I have no idea what S is supposed to express here. But in the code you can take two measurements in predifened interval and then compute S. – Maximilian Gerhardt Feb 18 at 20:09
  • S means the voltage sensitivity. Can you express what you said in code? – Abdulrahman Feb 18 at 20:31
  • you do it by coding the sketch. – Juraj Feb 19 at 6:13

I think you need something like the following :

int lastTime;

void loop(){
  int thisTime = analogRead(A1);
  int diff = thisTime - lastTime;
  lastTime = thisTime;

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