Hello Ath,

I have it now after the instructions from: https: // learn.adafruit.com/adafruit-max31865-rtd-pt100-amplifier/rtd-wiring-config
done, and a PT100 uses and now everything functions.

Thanks for your help

I have somewhere one more PT100 and tomorrow will test it.
I already thank for your help

Just also wear seen: https://learn.adafruit.com/adafruit-max ... duino-code

My MAX31865 are for PT100 and not for PT1000.
I had bought them, actually, for PT1000.

@Ath The short circuit at the measuring places has brought nothing. As far as I know, 3 wires and 4 wire connections is to be measured only around the opposition value of the management out. @Thomas I thought, actually, for this Boards if a pullup resistor was no more necessary there already the Rre...

The right value stands on the board

Hello Ath, Excuse me, my mistake. With the GND has happened to me with the construction for the photo. You surely have him was on 3.3 V. I had tried the red one also already on 3V3, with the same result. Till present, however, I had even seen circuits with which the red on Vin was connected. Rref is...

Hello Thomas,

I have done sometimes a few pictures and if one hopes all important one can see on it.

Yes, I have also already done. I use to the test mostly pullover cable.

ESP_Easy_mega_20220427_normal_ESP8266_4M1M

It is not the newest, but I fear in it it does not lie.

Yes, I had already tried D8, but without success.

Hello, I urgently depend on technical help. In nodeMCU with ESPeasy I pursue a MAX31865 with PT1000. In ESPeasy SPI is activated. The values the ESPeasy is economical are fanciful, they go from 958 °C to-241 °C. On every issue the value changes extremely. NodeMCU as well as the MAX31865 and PT1000 I...