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The MQ-137 is an Ammonia (NH₃) gas sensor
The voltage to pulse width modulation (PWM) can transform analog voltage into 0-100% PWM duty cycle output
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Pin 8 – GND: Ground
Diameter: 2mm
28W Dual USB Wall Fast Charger and Power Adapter QC3 (5V-3A) analog to digital The MQ-137 is an AmmoniaDual USB ports can charge 2 devices simultaneously at the fastest speed. The first port is QC3 USB charging port. QC 3. 0 (Qualcom Quick Charge) is a charging protocol designed by Qualcomm, used for managing power delivered over. It offers multi voltage charging 5V 3A, 9V 2A, 12V 1. 5A. The second port can outputs5V 2. 1A. Both ports can be used at the same time. Moreover, The charger offers built in over current, over heat, short circuit and other