Two LEDs on a single GPIO pin!
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Күн бұрынYou want to connect two LEDs to your microcontroller but you have only one GPIO-pin left?
In this video I present an alternative solution to the one presented by Ralph Bacon in his recent video • #241 Yikes! Only ONE G...
@k1zmt Жыл бұрын
For some sort of reason I expected 1-Wire protocol driven switch. Voltage follower is a pretty clever idea!
@RalphBacon 2 жыл бұрын
Nicely done! It's certainly an alternative to my solution. I will store this in a filing cabinet in my brain for some time in the future. If it ever comes up in a future video of mine I'll pretend it was all my idea, obviously 🤣 I would have to test your assertion that blue LEDs would light up with just 2.5v but even if they did not it's not a huge loss as I hate those overbright blue LEDs that seem to pop-up everywhere now. Until the next video! 👍🏻
@uwezimmermann5427 2 жыл бұрын
Thank you Ralph. Feel free to take it and run with it... it's not my invention either!
@7alfatech860 2 жыл бұрын
Very nice to see you building on Ralph's ideas. I do like the idea of using the op-amp, since they are cheap and almost any will do. In addition, the current through the voltage divider will be very low (about 0.125 mA)
@uwezimmermann5427 2 жыл бұрын
you could reduce the current through the divider even more by using higher-valued resistors, it would still work well with >100 kΩ. On the other hand power consumption for the whole system is not an issue if you are at the same time running two dozen LEDs.
@avr_stm_pro2955 2 жыл бұрын
👍👍👍
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