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Button Pad Controller SPI
Replacement: None. It's time for this product to step aside and make room in the catalog for even more cool stuff. This page is for reference only.
The Button Pad Controller SPI was designed to compliment the Button Pad Controller USB; though it can also be used as a standalone device. The board is 4”x4” and has 16 tri-color LEDs and 16 corresponding button pads (i.e. The button pad surrounds the LED). The boards communicate via an SPI bus, and up to 10 Button Pad Controllers can be connected in a system (including one Button Pad Controller USB). The default firmware uses a 24 bit color scheme. Each board comes configured to work as a standalone unit and must be reconfigured for multiple board systems.
We do not sell the frames shown in the photograph. We put those together for our own use as a demonstration of what two units look like, boxed up together.
Unit comes fully assembled and tested as shown. Unit does not include top button pad (listed below).
Replaces:WIG-09022
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I'm curious how this (and the other button controller) gets away with running the LEDs directly from the shift register with no current limiting resistors? Is the output impedance of the shift reg high enough to limit the LED current itself, and if so does this put undue stress on the shift register?
You might take a look at the LoL shield. It does the same thing. Essentially when both sourcing and sinking current via the ICs used, 74LS595 and ULN2803 respectively, there is enough current limiting in the system that current limiting resistors aren't necessary in this case.