After examining BLDC controllers available on the net (mostly for RC airplanes), I decided to design and build my own controller for robots. Requirements
Controller is based on Atmel ATmega8 chip with limited number of external components. Preliminary design is finished. I will publish here all schematics, board and software. The early version of the schematic is available at the end of the page. This project was never finished
Voltage divider with low pass filter connected to ADC inputs. ADC reference voltage equal to power voltage. Voltage divider with low pass filter connected to ADC input. Designed to use with internal reference voltage 2.56V. Voltage divide with low pass filter connected to analog comparator. Input is compared with internal reference voltage 2.56V. IRL2703 MOSFETs (TO-220AB package) controlled by IR2101 chips. 7805 to provide 5V. ISP connector, RS232 (5V) connector, I2C connector. Power, program and user function LEDs. Early prototype version of PCBs, two prototypes were made. Size 10x8cm. Needs to be optimized.
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