The MonkMakesDuino is an Arduino-compatible board with the unusual form of a single row of pins. This board is the subject of this Kickstarter campaign.
Here is a PDF of the schematic. These are for the latest prototype which shouldn’t change much before the final product.
Any feedback on the design would, of course, be much appreciated. Along those lines, here are some decisions I made when designing the board.
- No voltage 5V regulator. Using 5V USB as the main supply helps keep the price point low. You can always add one to the breadboard or protoboard.
- 3.3V regulation by the CP2102. It’d be rude not to use this feature of the chip and again it saves a few pennies.
- MOSFET buffering of ‘L’ LED. This is cheaper than the Uno’s op-amp solution. There is no pull-down resistor on the gate of the MOSFET leading to the ‘L’ LED coming on with random touches of the connector pins. Although some might see this as evidence of their board being faulty, I quite like the way it shows how a MOSFET works.
- Polyfuse. Although it’ll do little to protect the 3.3V supply, it does make the 5V connector pins short-circuit-proof and protects any 5V USB power supply connected.
- Choice of pins. I relegated AREF and the A6 and A7 pins to a separate row that is supplied unpopulated, but advanced users can solder their own connections to these if they have a need.
- No ICSP connector. Unnecessary, as all the SPI and Reset pins needed if you really want to use ICSP are available on the edge connector.