Video on how to make a resistance meter, ohmmeter out of Arduino. In this video, I also talk about how to correctly calculate the voltage divider for a thermistor (thermistor). The material is also suitable for other microcontrollers such as WeMos, ESP8266, ESP32.

An article based on this video: https://www.2ram.ru/l/51

00:00 Introduction
01:05 ADC in microcontrollers
03:50 Suppression of radio interference at the input of the ADC
04:35 Voltage divider, derivation of the formula for measuring resistance
07:35 Analysis of the formula for measuring resistance
10:01 Minimum code for resistance measurement
10:25 Derivation of the formula for the optimal value of the reference resistance
12:40 Example, solving the problem
14:35 What leverage is to connect the divider?
14:58 Example of an electrical circuit, assembly, testing