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1

If the provided source is cut down to the lines that have to do with the temperature, it is just this. If you try this sketch it should behave equally "wrong": const int sensor = A5; int tempc; float vout; void setup() { vout = analogRead(sensor); pinMode(sensor, INPUT); } void loop() { lcd.print(tempc); tempc = (vout * 500) / 1023; } In ...


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Why do you compute tempc only after you print out the value in serialOutputWhenBeatHappens`? You also forgot to read the temperature continuously. Here is how I would do it: void loop() { // read the sensor before it is printed on the LCD vout = analogRead( sensor ); // here I'm not sure what you are computing // you map the sensor voltage to ...


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Code seems to lack a repeating update of tempc via vout =analogRead(sensor); An alternative might be changing the line for setting tempc to be tempc=(int) (analogRead(sensor) * 500.0f/1023.0f);


2

Most Arduino boards come with a bootloader of some form. This bootloader may do things with IO pins. However apart from that, no, nothing else happens to any IO pins. The bootloader may: Flash pin 13 (built in LED) Configure and communicate on pins 0/1 (UART) With no bootloader then absolutely nothing happens on any IO pins.


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I made an Arduino( Arduino Nano) circuit to power a 12V Peltier(which is also a high power source.) using a MTP3055V MOSFET 60V 12A transistor. And the circuit is operating very well.


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