The Alcor drive corrector produces a variable frequency 120 V AC output for a telescope's right ascension (RA) drive using synchronous motors. And 5V/12V PWM DC output for the declination axis motors. I have designed it for the old Celestron/Meade Fork mounts from the 80s. It allows tracking corrections to be made during long-exposure photography.
The Aclor drive corrector can be used with modern guiding software like PHD2, etc. Guiding pulses can be send over the ST-4 input or the USB port. It supports the LX200 command protocol set.
You can find the schematic and Gerber files in the pcb/ directory. I have exported the Gerber files so that you can let the board manufacture by JLCPCB ( www.jlcpcb.com).
This is the final pcb after soldering all the components. Note to set the Jumper between X3-2 and X3-3 for 5V output voltage for the DEC motor.
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Enclosure 120 mm x 84 mm x 44 mm, Model: Hammond 1457K1202BK
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DEC Motor JMI MOTODEC JMI MOTODEC
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Celestron 4 Button Hand Controller Discussion on cloudy nights
The firmware was written specifically for, and tested with, a Teensy 2.0 microcontroller board. It may work on other boards with an ATmega23u4 microcontroller.
Follow these instructions to flash the firmware. https://www.pjrc.com/teensy/first_use.html https://www.pjrc.com/teensy/loader.html