Activity for ericâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #276142 |
actively being driven high when setup as an output pin. (more) |
— | over 4 years ago |
| Comment | Post #276142 |
Olin, thanks for the awesome answer. Spot on, I was concerned that this was an unreliable circuit, and now I understand why. As you suggest, I will drive the LED with 5V, and then use a constant current circuit driving the led on with 20 ma. To clarify on R2, the 10K to ground. I think you are correc... (more) |
— | over 4 years ago |
| Edit | Post #276138 |
Post edited: |
— | over 4 years ago |
| Edit | Post #276138 |
Post edited: |
— | over 4 years ago |
| Edit | Post #276138 | Initial revision | — | over 4 years ago |
| Question | — |
Driving LED with NPN transistor from I/O pin I'm trying to understand a circuit for driving a LED found on a board I purchased. Below is the circuit driven by an I/O pin (HS2) of a small 3.3V processor. led driver schematic The HS2 pin is driven by the I/O with these specs: V(high) = 0.8 · Vsupply = 2.64 V V... (more) |
— | over 4 years ago |