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wondering about a adafruit product.....

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If I were going to make a robot using the blue 8x8 led matrix backpack as a face for the robot, and have 3 tac pin buttons to display 3 other faces for a few seconds, would I need a micro-controller? I asked Adafruit but it's been several days & I haven't gotten a response.

You could do it with 555 timers driving high-current transistors to switch in different patterns. Each "face" would be a different pattern, directly wired through the corresponding transistor (in-line with current-limiting resistors), with corresponding 555 timer. That's one set per face; you could use the 555's "on" state to disable the default face's transistor (a fourth transistor). Now, however, you're talking about three 555 timer chips with passives and four transistors. Would it be simpler/cheaper to use a mini pro?

I run one of the 8x8 mini matrix things and use a µcontroller. Just add a trinket pro to your project. Set it up so you can send a message telling it what you should show. Kinda' a "mood byte".

-jim lee

im using a gemma.....

Hey there,

You will definitely need a micro-controller to drive the LED matrix backpack. We have a few project tutorial to check out for getting started. Thanks!

https://learn.adafruit.com/trinket-slash-gemma-space-invader-pendant
https://learn.adafruit.com/3d-printed-led-animation-bmo
https://learn.adafruit.com/adafruit-led-backpack

yeah... i now know (after i posted to the adafruit forms.) and.... now i need to learn ardruino... and well, please take this as a suggestion for updating a post... you might want to show the compleate noob to arduino HOW AND WHY the code works with a video or detailed description.