We are working on a project for our Senior Design class. We are making a News Delivery Screen and have been using one Peggy2 as a starting point to test out our programs. We need to make the screen much larger, roughly 2' x 3' as called for by our assignment. The board also needs to have a photo-diode attached to it to change the brightness of the LEDs based on surrounding illumination. We've been debating purchasing more Peggy2 boards, but have some questions before we would do so.

1) Is it possible to connect multiple Peggy2 boards together to achieve the required size of our screen?

2) Is it possible for us to attach a photo-diode through an ADC directly to the board using the boards programming to control LED brightness based on input from the photo-diode?

3) Is there anyway we can get a schematic of the board for the analysis we are required to have for our project presentations?


We would really appreciate any help you can give us.

1) http://www.evilmadscientist.com/forum/viewtopic.php?showtopic=4078&topic=4078#4078 (Topic title "Peggy2 x2" )

2) Probably.

3) http://www.evilmadscientist.com/article.php/peggy2, scroll down to "How do you make it?"

1) As squall_line said, 3 wide is easy. You can, in principle, put three more side by side but upside down to make the 2x3 display. To do this without a gap, you'd need to trim down the circuit board. The circuit board is actually designed to allow this-- there are no traces above where it says "D0" to "D24" on the top of the board. However, it will be difficult to trim the board-- you'll need access to a hydraulic shear (common in machine shops) to cut it.

2) Yes. Four analog inputs on the Peggy 2 are available for user configuration. One common use is as digital inputs for the buttons, but you can hook them up to photodiode-based inputs as well. There's a "proto area" on the board where you can put the photodiode and any bias resistors that you might need.

3) Check your instructions for the URL of the schematics for your particular version of the Peggy 2.