TempReader library not working on supported board

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1

I am trying to control a PWM fan on a Arduino Nano. I haven't attched the fan or the control code yet, as I'm testing the method of reading chip temperature first

I have just tried the TempReader test code, however it is reading -23C and 1C when it is 30C ambient temperature.

Not really sure why, the Nano is supposed to be supported by the library.

Here is the example code:

/*
*   An example code to demonstrate the use of TempReader library.
*   This program prints the chip temperature to the serial monitor at every 0.5sec interval.
*/

// Import TempReader
#include <TempReader.h>

// Create an object of TempReader
TempReader t;

void setup() {
  // Initialise Serial Communication
  Serial.begin(9600);
}

void loop() {
  // Read the temperature value in degree celsius
  int temp = t.ReadTempinC();

  // Display the value in the serial monitor
  Serial.print("Chip temperature is ");
  Serial.print(temp);
  Serial.println(" degrees Celsius");

  delay(500);
}
2

What thermometer? Show a wiring diagram. You know the procedure. "-23" looks like a max negative value, like it is not providing an output.

3

Bare board - the TempReader library (supposedly) measures the internal chip temperature.

https://docs.arduino.cc/libraries/tempreader/

4

Of a nano?

I read your link. I did not know.

1 Like
5

According to the official documentation on the Arduino website, yes!

6

Is your board legit or knockoff?

1 Like
7

A knockoff but I did confirm, it is a ATMEL ATMEGA328P.

On an original Uno, it is also incorrect, reading 16C. I find it doubtful the chip is cooler than the ambient temperature by THAT much

8

It seems the internet has this code for calibrating the reading:

The library does not use the "delay()" for voltage stabilization:

10

Interesting. How would I be able to do an automatic calibration rather than basically guessing till I get it right?

11

Very good question. I will be searching.

I am also curious how it is done with the LM35/LM36 and DHT. I assume (but not sure) it is factory calibrated and creates voktage changes per partial unit of temperature.

12

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