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v2 of this board has the mounting hole position corrected - it was off slightly in v1.
This is an interface board to put on top of the Raspberry Pi (r2). Solder in only what you need. It's wired to use the A-to-D chip MCP3008 with GPIO27, 22, 23, & 24 pins (header pins 13, 15, 16, & 18 respectively). The 8 analog inputs have resistor-divider options for inputs that need to be scaled to less than 3.3V or you can leave the dividers empty and jumper each input directly to the terminal blocks which also provide 5V and GND for powered analog sensors. The other 3 terminal blocks are wired to 11 other GPIO and 1 GND. 3 of these GPIO have the option to control 3 transistors. The remaining 2 GPIO (4 & 25) are wired for 2 optional LEDs. Power taps for 5V, 3.3V, and GND are also on the board.