Sensor Temperature LED voltage

Spartan 3 Lite
1

Hello-
I would like to know the 'Sensor Temperature LED output" (blue wire) voltage so I can see if it is suitable to log as a digital input with a trigger threshold of 3.5V.

I don’t yet have my unit to check it, so I was hoping someone here could let me know, if it happens to be 3.3V then I’ll need to add some hardware to adjust the voltage.

Thanks!

2

To answer my own question - it appears to be 1.8V. So I will have to up the voltage to use it as a digital signal.

3

This leads to another question. Since it’s such a low voltage, is this really an LED driver circuit? Is anyone actually using it to drive an LED and can share what type?
Is there a limit on the amp draw of this wire?

I just want to make sure it isn’t a 1.8V UART microcontroller output before I amplify it’s voltage (if it is, I’d need a transistor based solution).

Thanks for any information!

4

@CPMaverick Did you ever make any progress with this? I wired mine up into a digital pin and it wasn’t working. I had assumed it would have been a high enough voltage, but at 1.8v that’s not gonna be enough and makes sense why. I could just stick it in an analog pin, but that seems like a waste.

5

I have not solved this, unfortunately. It’s on the back burner. I have looked at a few relays but I don’t know the amperage this pin can pull, so it’s hard to know if they will work…

If you come up with any ideas please post them, and I’ll do the same - but I’m probably a couple months from getting to it

6

@CPMaverick Was thinking that a transistor could be wired in line and heat shrink, would need another wire to ground but with a pull up it should work I think, just have the output be flipped?