Eaglefree PIC18F2550 development board
Jose built a PIC18F2550 development board. It’s on a single layer with all through-hole components, making it friendly to DIY PCB etchers. It was designed using the Eagle free license constraints, and fits within the 10cmX8cm board format. The board features:
- 8 LEDs.
- 4 push buttons with pull-down 220Ω resistors.
- 2 potentiometers.
- 1 relay with an active LED indicator. For using the relay, you must provide an external power supply.
- 1 H bridge.
- 1 barrel connector for H bridge power supply.
- The board can be supplied from the USB or from an external supply (jumper selectable).
- 5V regulator onboard.
- ICSP port for PIC programming.
- Jumper for enabling/disabling programmer voltage. This allows for the programmer to be powered from the board supply, so we can have the programmer plugged to the board all the time.
Via the comments.
This entry was posted in dev boards and tagged Dev board, Eagle free, PIC18F2550.
Comments
This the first (and only) dev board I’ve designed and built myself, and must say it’s been very useful. Besides the changes I’d like to make (mentioned on the download site), I’d also like to have push buttons with pull-up resistors.
Sometime ago I uploaded a couple of videos to Youtube:
http://www.youtube.com/watch?v=m5VXPaHua2M
http://www.youtube.com/watch?v=ryuTv0r2FkE
Lately, I’ve been using it with the Pinguino bootloader :).
Thanks for featuring it DP!
Port B of the PIC18F2550 has optional pull-up resistors already. They’re described as “weak” but probably plenty enough for push buttons (up to 8). They’re turned off by default, and at reset, but your firmware can enable them before reading the buttons.
“Eaglefree”, NOT as in free of “free” Eagle’s restrictions. Sucked me in with hopeful anticipation…
Cool design!