Thanks a lot for the detailed description for temperature sensing modules in the “Learn” Section! I’d like to build one of the modules for PT1000 sensors and have a question: the LM324 (operational amp to amplify the sensor signal) has a V+ and a V- pin. Do I need an negativ -5V input additional to the +5V from the arduino or can I simply connect the negtive port to GND? How can I set that negative voltage up?
I know that the question was already ask in RTD Temperature sensor module, but the answer doesn’t help me much - I look in the datasheet and there a negativ source is required but I don’t know which voltage and how I can provide it.
Thank you in advance