Updates and Design Files
I hope you all had a great holiday season. It was great to be able to have everything sent out before so we could enjoy some time off.
We are now back at it again and working on documentation and are also hopping to have the ability to buy additional minions set up here in the next week or so.
A google group has been started over at https://groups.google.com/d/forum/minioncity by Baruch. I’ll be watching there as questions come up as well as comments to the blog.
So first off here is the schematic of the minions.
There are a few key differences from the normal arduino.
First off is the lack of an led on pin 13. Routing was getting a little tight so removed it. The two LEDS on the board are tied to TX and RX. Which is why you see them blink when downloading your code.
The second is the radio. It uses 5 lines to talk to the processor.
MOSI,MISO and SCK are part of the spi bus and are not part of the numbered ports in arduino. As a side note if you want to reprogram the processors bootloader you need a pullup resister on D10. D10 is the select line on the radio. The RF12 library uses an internal pullup resister to do the job but when you are resetting the processor to burn in a bootloader it is released and causes problems with the programmer. The battery shield added a 10k resister for programming.
D3 and D10 are part of the normal pins and shouldn’t be used when you are using the radio.
The eagle files for the main board and the battery shield are available at
(Schematics and board layout)