this post was submitted on 27 Dec 2025
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Unlock Small Doors on a Grid (lemmy.world)
submitted 2 months ago by wulf@lemmy.world to c/askelectronics@discuss.tchncs.de
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So I have an idea of a habit builder (also I think it would be fun to build)

Essentially, one piece tracks the habit, and one piece unlocks doors (small, in a grid) based on habit trend. Inside each door would be a "prize".

My question is about the small doors.

  • Is there an example of small unlocking like this I can use to expand to multiple doors?

  • The idea is there might be more doors than pins on the microcontroller. Is there a board I could put inbetween, or a special technique since they are on a grid, to accomplish this?

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[–] cmnybo@discuss.tchncs.de 3 points 2 months ago

An easy and cheap way to get more outputs from a microcontroller is to use a shift register such as a 74HC595. Each one has 8 outputs. You can connect the serial data output of one shift register to the input of another and chain together as many as you need.

For driving large numbers of solenoids, multiplexing would probably be the better option though.