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PWM Stepper Motor Driver Simple Controller Speed Controller Forward and Reverse Control Pulse Generation

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Get PWM Stepper Motor Driver Simple Controller Speed Controller Forward and Reverse Control Pulse Generation Feature:    Product name: simple controller Model: CW-S01 It can generate PWM signal. There is a jumper on the board, which can be set and selected. By default, it is set to generate pulse frequency signal.   Product Manual: 1. When the controller generates a pulse frequency signal, it can supply a stepper driver as a signal. To control the stepper motor, it must be equipped with a driver. (This simple controller + stepper driver + stepper motor + DC power supply can form a simple control platform.) 2. The controller can generate a pulse frequency signal or a PWM pulse width signal. There is a jumper on the board, which can be set and selected. By default, they are set to generate pulse frequency signals. REQ is to generate pulse frequency signal PWM is to generate PWM signal 3. When the controller generates a pulse frequency signal, there are three types of high, medium and low...
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MQ137 Gas Sensor Module MQ-137 Ammonia Sensor Module NH3 Sensor Module

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Buy MQ137 Gas Sensor Module MQ-137 Ammonia Sensor Module NH3 Sensor Module Description:   Size: 32mm X22mm X30mm length * width * height Main chip: LM393, NH3 gas sensing probe Working voltage: DC 5V   Features:   1. It has a signal output indicator indication; 2, dual signal output (analog output and TTL level output); 3. The TTL output valid signal is low level; (when the output low level, the signal light is on, it can be connected to the IO port of the single chip) 4. The analog output increases with increasing concentration, and the higher the concentration, the higher the voltage; 5. High sensitivity and selectivity to ammonia; 6. Has a long service life and reliable stability; 7. Fast res ponse recovery features; 8. With mounting holes for easy installation; 9. The probe can be plugged and unplugged for easy testing.   Application:   Harmful gas detection device for home and environment, suitable for the detection of ammonia vapor, ammonia gas sensor test concentration rang...
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