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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2 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.