A quick project to simplify Picaxe prototyping on my breadboard. The idea is to house the Picaxe chip (either an 08M or 14M) and "standard" serial interfacing circuit on a "breakout" board that can be easily plugged into the breadboard while providing easy access to the chip's pins.
- power input, about 5V, will be regulated by LM7805
- 3.5mm stereo serial socket
- serial mode selector, switches serial in between "pin 5" (program mode) and "pin 3" (control mode)
- power switch
- jumpers to allow isolating standard serial circuit to "override" via breadboard
- 14 pin socket
- header pins to provide 5V and 0V to "power rails" of breadboard
- header pins to connect Picaxe to breadboard
For some unknown reason, I had to add an extra 10k resistor between leg 2 and ground (soldered on the underside of the pcb, not shown on schematic.)
The board works pretty much as I'd hoped. Unfortunately it is quite difficult to insert/remove from the breadboard so a future version would only have a single row of header pins. Another addition would be a DC socket to allow powering from a "wall wart" and I'd improve the layout a little to allow easier access to the switches.