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When you use it as a charger
unsigned int runningValue = 0
MQ-4 Natural Gas Sensor Module pin description
High sensitivity: The MQ-4 sensor has a high sensitivity to methane gas
PCA9685 16 Channel Servo Motor Driver(Soldered) Gears Belts & Pulleys When you use it asPCA9685 16 Channel Servo Motor Driver(Soldered) This is 16 Channel 12 bit PWM Servo Driver I2C interface PCA9685. You want to make a cool robot, maybe a hexapod walker, or maybe just a piece of art with a lot of moving parts. Or maybe you want to drive a lot of LEDs with precise PWM output. Then you realize that your microcontroller has a limited number of PWM outputs! What now? You could give up OR you could just get this handy PWM and Servo driver