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If you are interested in experiments described here, don't hesitate to contact. Detailed documentation, circuit schematics, datasheets and source/binary codes will be available using file sharing service. Also, I would like to know your results. For contact use an IM service on website where this blog was referred from.

2014-03-30

Microcontroller Unit

For all our experiments, a simple bread-boarded microcontroller unit was built. It contains the ATmega32 16 MHz AVR RISC microcontroller, which have enough Flash and RAM for our tasks. Also its internal peripherals are suitable and I/O pin count is good. The board also contains voltage regulators (+5V for unit, +6V regulated for air compressor and original valve), 4 N-FET switches, 3 LEDs (red, yellow, green for standard indication), 2 programmable buttons and RESET button, ISP programming interface, UART RS485 interface (for communication with PC over a longer distance), 4 DIP switches for operation mode (application) selection and instrumentation amplifier for air pressure sensor. There are also reserved pin groups for I2C bus connected sensors and for the standard 2 x 16 characters LCD display.

Bread-boarded microcontrolelr unit
The metal shield in the right bottom corner contains the instrumentation amplifier, which is very EMC sensitive. The pressure sensor is placed on the bottom side of the board, where access will be better to it. All mechanical parts will be placed on second stage under this board.

In the first experiments, the unit will remain on bread-board. The PCB will be made after the configuration will be verified in praxis. Several changes will be made in the actual form before.
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