Just a quick update on the Sleepduino project: the PCBs for the Sleepduino Shield and Standalone Sleepduino arrived from the fab yesterday, and they work a treat.
Here’s a quick comparison between the Standalone Sleepduino and its breadboarded prototype:
As you can see, the Standalone Sleepduino is pretty compact, but still packs all the features of the original Arduino-powered version. In fact, it’s possible to take the (socketed) microcontroller out of the Sleepduino and upload a revised sketch, if you’ve got an ATtiny or similar or a spare Arduino to do the programming.
Just in case you doubt it works:
At some point, I’ll be making a few tweaks to the design and then exporting some Gerbers for mass-production. Once I’ve got a costing for the PCB fabrication and parts – a 10K poteniometer, piezoelectric buzzer, three RGB LEDs, three buttons, nine 270-Ohm resistors and an ATMega-328 with socket – I’ll have a better idea of whether the project is worth pursuing.