Resistor Sensor, is this upstream or downstream?

ESPHome
1

Hey All,

Trying to get some temp reading from an NTC Sensor, im working on getting the readings properly but I’m having a bit of a hard time undrestanding ‘upstream’ vs ‘downstream’, in this pic am I upstream or downstream?

“There are two kinds of configurations for this circuit: Either the variable resistor is close to GND (DOWNSTREAM) or it is closer to VCC (UPSTREAM).”

I think I am downstream but I was hoping someone could confirm for me.

Thanks
Jon

IMG_2505
IMG_25051536×2048 750 KB

2

For lord’s sake draw us a circuit diagram, even on a piece of paper and take a photo.

1 Like
3

sorry its late!

It’s basically this:

698×359 113 KB

except on 3v3 and going into A0 on an esp8266

4

I am sure it is downstream. The variable resistor (which I assume is the black thing) is between the measurement point and ground.

5

thank you, still trying to understand it all and a little confirmation really helps, thanks!