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An ESP32-Dev WiFi focuser. DIY or PCB designs.
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Spreadsheet to calculate what stepper motor to use.
https://sourceforge.net/projects/arduinoascomfocuserpro2diy/files/Documentation/Nema-Stepper-Motors.xlsx/download
Spreadsheets to calculate...
This Android Library manages SPI, I2C, GPIO, ADC, UART and PWM in an Embeded System running Android.This library allows you to write Android applications that can use all hardware available in the system.