MQ137, NH3 Gas Sensor Module for Research and DevelopmentDescription: 1: Wide range of applications 2: Wide detection range 3: Fast response (less than 1s) 4: High sensitivity (3%) 5: long stable life The MQ137 module is a sensor board designed to detect NH3 ammonia and other gases. The sensitive material of the MQ137 gas sensor is SnO2, which has low conductivity (high resistance) in clean air. When the target sensitive gas is present, the conductivity of the sensor increases with the gas concentration.

This breakout board for Allegro’s A4988 micro stepping bipolar stepper motor driver features adjustable current limiting

I had to specify the EP4CE6E22C8 chip

The static current: 6mA

Compact Size: Small and lightweight for easy portability

It is a complete 4 wheel drive platform

Power Consumption: Low power consumption for efficient operation

respectively corresponding to the connection of the Enable/Step/Dir/Gnd drive signal output

this fail-safe feature that guarantees a logic-high output if the input is open circuit

and flexible integration options

Complete Help of codes with Videos

0 Audio Receiver module with the auto-reconnect feature

The module is based on the TP4056 chip