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DFRobot PT100 gravity shield (SEN0198) with ESP32

Unread postPosted:Wed May 12, 2021 8:07 am
by fabc090909
I've bought a Gravity: Analog High Temperature Sensor (SEN0198) with included a PT100 probe (https://wiki.dfrobot.com/HighTemperatur ... KU_SEN0198).

I'm trying to use it with an ESP32 with DFRobot library (https://raw.githubusercontent.com/nxcos ... raries.zip) and the results are far from correct.

At ambient temperature a DS18B20 is measuring 18-18.1 °C while the PT100 is measuring between 7 and 9°C.

In the code I select 3.3 V (same voltage as ESP32 output)

#include<DFRobotHighTemperatureSensor.h>
const float voltageRef = 3.300; //Set reference voltage,you need test your IOREF voltage.

Do you have any idea how to solve ?

Thanks a lot