Since we discovered the Arduino platform, we've been busy coming up with ways to DIY our lives. We found that a lot of our microcontroller(mainly Arduino)-based projects, like "The 1337:Clock", and the Arpegguino have the need for a numeric display.
We also found that where common-anode 7-Segment LED displays were easily available from popular distributors like SparkFun, the widely-available drivers seemed to be for common-cathode displays, and --when it came to multiplexing the displays-- there was no escaping the inevitable "rats-nest" of tangled wires without a breakoutboard. We liked the idea so much, we decided to share our idea with the larger development community, and give something back to the open source hardware development movement. Ergo, the idea for this project was born.
A lot of Highly Caffeinated beverages and empty chip bags later, we had the eagle files drafted for the first revision, We're ready to start cranking these bad boys out as soon as we receive funding. We can already think of a bunch of projects that would benefit from one or more of these! (They're chainable!)
This board has vacant footers for two(2) of the Young Sun style displays, available from sparkfun.com in green, white, blue, red and yellow, the ICM7218A driver chip, and the two(2) capacitors -which are the only external components required by the chip to operate. The traces on the board take care of multiplexing the displays for the maximum 8 digits, and the pertinent pins are broken out to headers for easy display-chaining and communication with the microcontroller. This revision includes space for an MCP23008 I2C I/O expander to reduce the required microcontroller pins from 10 to 4; and the I2C address of the device can be changed with a single jumper that connects the appropriate pins to 5v, or GND depending on your preference, or need!
We wanna change the way you define possible.
- (30 days)