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How to use the DAC analog output in an ESP32

How to use PWM analog outputs on an ESP32

How to control up to 16 GPIO by I2C with PCF8575 extender and Arduino

How to use an I2C bus extender TCA9548A and Arduino

Adapting 3.3V to 5V (and vice versa) in Arduino with Level Shifter

Switching Loads with Arduino and Solid State Relay

Up to 32 servos on Arduino with USC-32 controller

Control 16 servos or 16 PWM outputs on Arduino with PCA9685

More digital pins with Arduino and PCF8574 I2C I/O expander

More outputs/inputs in Arduino with CD74HC4067 multiplexer