HLW8032Sensors
AC power meter
How to measure the voltage, current and power consumed by a 220 V AC load using the HLW8032, a resistive divider and a 1 mΩ shunt resistor.
Sensors
LM324Sensors
Photodiode light sensor
How a transimpedance amplifier built with an LM324 and a feedback resistor converts photodiode current into a voltage proportional to the received light intensity.
HX711Sensors
Force/weight sensor
A concise guide to the HX711 from Avia Semiconductor — pinout, two-wire serial interface and internal regulator for connecting a load cell directly to a microcontroller.