Two LEDs on a single GPIO pin!

You 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]

For some sort of reason I expected 1-Wire protocol driven switch. Voltage follower is a pretty clever idea!

[@RalphBacon]

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]

Thank you Ralph. Feel free to take it and run with it... it's not my invention either!

[@7alfatech860]

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]

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]

👍👍👍