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DRV8825, Diagrams, etc.

Michael Ingraham 2019-10-15 15:03:03 -04:00
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A4988-Stepper-Motor-Controller.md

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Use an A4988 controller to easily control stepper-motors like "NEMA 17" and siblings. Detailed information about the controller can be found in the [datasheet](http://www.allegromicro.com/~/media/Files/Datasheets/A4988-Datasheet.ashx?la=en).
Use an stepper motor controller to easily control stepper-motors like "NEMA 17" and siblings.
## Enable A4988 support
## Enable Stepper Motor Support
To enable this feature, add `#define USE_A4988_STEPPER` to your `user_config_override.h` file and compile your own firmware.
## Connecting the motor controller
@ -25,7 +25,15 @@ There are six corresponding GPIO [components](Components) for this Tasmota drive
`A4988 MS2 (174)`
`A4988 MS3 (175)`
The minimal configuration for the A4988 are the `DIR` and `STEP` signals. In such a configuration the motor will be permanently powered and microstepping will be set to 1/1 (full steps).
The minimal configuration for the A4988 are the `DIR` and `STEP` signals. In such a configuration the motor will be permanently powered and microstepping will be set to 1/1 (full steps). Detailed information about the A4988 controller can be found in the [datasheet](http://www.allegromicro.com/~/media/Files/Datasheets/A4988-Datasheet.ashx).
#### A4988 Microstepping Configuration
![A4988-Truth-Table](https://user-images.githubusercontent.com/34340210/66860427-2d256a80-ef5b-11e9-9979-47778140661f.png)
### DRV8825 Controller
The A4988 is directly pin compatible with the DRV8825. Only the number of microsteps is different (there are more on the DRV8825).
#### DRV8825 Microstepping Configuration
![DRV8825 -Truth-Table](https://user-images.githubusercontent.com/34340210/66860425-2d256a80-ef5b-11e9-95cf-6625833eea87.png)
## Operation
Refer to the [Stepper Motor Commands](Commands#Stepper-Motors)
@ -39,4 +47,15 @@ Thus the wish to install a high-torque stepper-motor (with shifting gear) was bo
The **"TasmotaSmartCatFeeder"** circuit consists of a WeMos D1 mini, a A4988 controller, and two power supplies (5V&12V). This all fits into the housing of the feeder and costs less than 50€!
Virtually everything which has to be moved or rotated can be done now using these cheap components. It can be a window, door, shutter, cat or dog flap, a solar panel which follows the sun, a moving spotlight, PTZ-camera, or whatever.
Virtually everything which has to be moved or rotated can be done now using these cheap components. It can be a window, door, shutter, cat or dog flap, a solar panel which follows the sun, a moving spotlight, PTZ-camera, or whatever.
## Wiring Diagrams
![Nema-17_v1](https://user-images.githubusercontent.com/34340210/66860250-d6b82c00-ef5a-11e9-8897-1a4e9d7fdf21.jpg)
![28BYJ-48_V1](https://user-images.githubusercontent.com/34340210/66860253-d91a8600-ef5a-11e9-9195-c816e329abb8.jpg)
### A4988/DRV8825 Stepper Motor Control Development Boards
[Banggood](https://www.banggood.com/A4988DRV8825-Stepper-Motor-Control-Board-Expansion-Board-For-3D-Printer-p-1238774.html)
[Ali Express #1](https://www.aliexpress.com/item/32908836265.html)
[Ali Express #1](https://www.aliexpress.com/item/32870732179.html)