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  1. I have recently been working on a CNC BoosterPack that I will make available on Github when completed later in the spring. Current specifications: Support for my HALified version of GRBL (based on 1.1), currently drivers has been made for MSP432 (black version), Tiva C and MSP430F2955. NOTE: firmware is built with CCS 6.1, MSP432 driver is 100% CMSIS based. Opto-coupled inputs, NC switches recommended. Opto-coupled outputs with 200mA open drain drive for spindle on, spindle direction, flood and mist. Can drive most relays and solenoids directly. Output section can be powered from internal 3V3 or 5V source, or from external source. If powered from external source outputs can be made opto-isolated via jumper setting. PWM-output for spindle speed currently directly connected to MCU pin (could be changed to open drain). I2C (IIC) interface with selectable voltage level (3V3 or 5V) via level shifter, dedicated interrupt input. I2C pinout compatible with my 4x4 keyboard project, supports jogging etc. Optional EEPROM for configuration settings for MCUs with no internal EEPROM. Polulu 8825 motor driver breakout board compatible. Fault signal routed to GPIO input. Considered for later revision: Break out SPI interface and add full support for Trinamic motor drivers. Optional (SPI) DAC for motor speed (laser power) control. This might require a 4-layer PCB and also solving the pinout cabal... --- Anything you want changed? Terje
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