Legal Removal Request

Post: Hello Hideaki Unfortunately, the ADP Pi Plus is not really suitable for measuring temperatures with PT100 sensors. The easiest way to measure a temperature with a PT100 sensor is to use it as a part of a Wheatstone bridge where the sensor takes the place of one of the resistors. To measure the voltage from a Wheatstone bridge you need a differential ADC which can measure the voltage difference between two points in the circuit. The ADC Pi Plus is not suitable for this as it uses single-ended inputs which means it can only measure the voltage relative to ground. We do have an [url=/p/65/adc-differential-pi]ADC Differential Pi[/url] which can measure differential inputs but you would need to use an amplifier between the Wheatstone bridge and the ADC inputs as the voltage output from the Wheatstone bridge is very small and would need to be amplified to a level suitable for the ADC inputs. Adafruit makes a [url=https://www.adafruit.com/product/3328]board designed for use with a PT100 sensor[/url] which can interface directly to the Raspberry Pis SPI port so you do not need any extra ADC circuits. Unfortunately, the Raspberry Pi only has two SPI inputs which means you could only measure two temperature sensors at a time and would need to find a way of switching between your 5 sensors. To answer your other questions about the ADC Pi Plus, the address selection header is the 12-pin right-angle header on the right side of the board. The [url=/p/69/adc-pi]assembly section of our ADC Pi page[/url] shows how to connect the header to the board. The default I2C addresses are 0x68 and 0x69. The python library for the ADC Pi Plus can be found at [url=https://github.com/abelectronicsuk/ABElectronics_Python_Libraries/tree/master/ADCPi]ADC Pi GitHub Repository[/url] We do not have any PT100 tutorials for the ADC Pi Plus.