ESP32: add precision analog inputs with the ADS1115
The ESP32 ADC is noisy and 12-bit. The ADS1115 gives you 16-bit, 4-channel, differential readings over I2C for $4.
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#adc
6 tutorials
ESP32: read bridge sensors with the ADS1115 in differential mode
Go past basic ADS1115 single-ended reads: differential inputs for bridge sensors, the PGA gain math, and a data-rate benchmark you can run yourself.
ESP32: add 8 analog inputs over SPI with the MCP3008
The ESP32 loses half its ADC pins the moment Wi-Fi turns on. Add 8 clean analog inputs with a $4 MCP3008 over SPI: wiring, real pins, and a full 8-channel sketch.
Pico: read the RP2040's built-in temperature sensor
Read the temperature sensor inside the RP2040 chip with MicroPython's ADC and the 27-degree conversion formula. Zero wiring, one ADC channel, and a warning about what the number actually means.
ESP32: measure water quality (TDS) with the analog TDS sensor
Wire the analog TDS sensor module to an ESP32, convert ADC counts to ppm with temperature compensation, and calibrate against a known solution instead of guessing.
ESP32: analog read with the ADC, and why ADC2 is broken on Wi-Fi
Use the ESP32's 12-bit ADC to read a potentiometer or analog sensor. Includes the ADC2 vs Wi-Fi trap and the input-only pin caveat.