I am recreating the Adafruit Powerboost 500c Circuit, but I want to reduce the LED's I need down to one. It has four LED's to represent the following signals, next to which I put the desired behavior for my circuit:
- BLUE - Power (I don't care about this signal)
- RED - Low Battery - The LED should be lit when the battery is Low.
- ORANGE - Charging - The LED should be lit when the battery is charging.
- GREEN - Fully Charged - The LED should be unlit when the battery is charged.
I am removing the BLUE LED and R5. I am removing the GREEN LED and R7. I want to light a single LED if either the input to the RED LED or the input to the ORANGE LED is high. I wasn't sure if just hooking both inputs to an LED without other circuitry was a good idea so I googled "OR Gate circuit" and discovered three possibilities: a Diode OR Gate, a transistor OR Gate, and an OR Gate IC. If any of these is the best choice, which is it and why? If none is best, then what is?
Note: I asked this question before in an attempt to ask in a "generic as to be helpful to others" way and I was told that I needed to provide more details (among other comments on my poor circuit design that, while helpful, didn't answer my question). I provide more details and the thread was too old to warrant attention and, consquently, I did not get the answer I was looking for. I would delete my old question if I could, as I clearly presented it poorly.