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Focuser Device
indi-allsky has the ability to control an electronic focuser mechanism to adjust the focus of all sky cameras.
If you receive a PermissionDenied exception when accessing GPIO pins
https://github.com/aaronwmorris/indi-allsky/wiki/GPIO-Permissions
This is a common and inexpensive stepper motor that is commonly distributed with a ULN2003 driver. This configuration only requires 4 GPIO pins (+GND and Power).
The 28BYJ-48 Stepper Motor has multiple variations, but the 1/64 geared is the most common variety. If you have one where the gear ratio is not supported, please open an issue and we can add the version.
https://ben.akrin.com/driving-a-28byj-48-stepper-motor-uln2003-driver-with-a-raspberry-pi/
| GPIO Pin | Driver Pin |
|---|---|
| GPIO Pin 1 | IN1 |
| GPIO Pin 2 | IN2 |
| GPIO Pin 3 | IN3 |
| GPIO Pin 4 | IN4 |
The NEMA17 stepper motor support 200 steps per revolution (1.8 degrees per step) in full step mode. This configuration requires only 2 GPIO pins in full step mode. One additional GPIO pin may be used for half step (0.9 degrees/step) mode.
| GPIO Pin | AS4988 Pin |
|---|---|
| GPIO Pin 1 | STEP |
| GPIO Pin 2 | DIR |
| GPIO Pin 3 | MS1 (optional) |
| GPIO Pin 4 | Unused |