| Electronics > Beginners |
| How do I make an LED light up using a comparator? |
| << < (6/7) > >> |
| alsetalokin4017:
--- Quote from: renzoms on October 22, 2019, 12:38:11 am ---5V rail > resistor > LED cathode - anode > Pin 1 --- End quote --- Shouldn't the anode be on the + 5v side? |
| renzoms:
You are correct. I mixed up the names |
| renzoms:
Got it to work although the timing is not accurate. Not looking into it rn. If my + voltage is higher than my reference voltage at - then output at Pin 1 should be High, so for this n channel open drain output, that means ????? When the reference voltage, -, is higher than the voltage at the + terminal, the output at Pin 1 should be Low, so for this n channel open drain that means??? |
| renzoms:
The timing is about over 4 seconds but it is calculated at 3.7s.... |
| Audioguru again:
--- Quote from: renzoms on October 22, 2019, 12:38:11 am ---5V rail > resistor > LED cathode - anode > Pin 1 --- End quote --- No, you have the polarity of the LED connected backwards. The LED anode must have its current-limiting resistor connected to +5V and the LED cathode gets pulled to ground by the comparator output pin 1. |
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