PicAxe 20X2 mainboard
May 27, 2010
This is the second board I received from sparkfun / batchPCB. The other one, a motor driver, is tested and done.
This one came with the same design fault: too small holes for the resistors. i'll have some work getting them mounted. Perhaps I should solder them to the surface instead of drilling out the holes. Drilling tends to destroy the solder pads and the through connection, making it next to impossible to properly solder anything.
There are 4 transistor buffered outputs (bottom left) and two general purpose outputs (or inputs). A socket for an EEPROM is on board as wel as a I2C port with a jumper to connect or disconnect the I2C pull up resistors (4K7).
The C-port pins, on the left of the picaxe are all general purpose (IO, V, Gnd) and the last 4 can be pulled down with 10K resistors that are connected with a DIP switch so that the pull downs can be disconnected if needed.
J3 is used to connect a jack for programming the picaxe. (Gnd, Serial-In, Serial-Out)
The board is 43mm x 58mm.
I'll add more info and a picture when I have the components mounted and did some testing. Everything has been tested and works perfectly.