This is only my second time working with any type of circuitry, so I apologize in advance if I don't use the right terms when I explain my problem. Feel free to correct me!
So in one of my projects, I used this instructable to create a pressure sensor out of conductive fabric. I followed the instructions and the sensor worked flawlessly. I actually want to do this on a larger scale. But of course, I'm testing this small version first before I move on to a big piece of fabric.
When I tried setting this up with an Arduino Uno (Uno is for testing purposes, I'm actually going to use a Lilypad), I was able to create this exact circuit, send light to the LED, and output the resistance value onto the Serial. But for some reason, when I remove that LED, it looks like the connection going into the Arduino, sending the resistance information, won't go through. You can take a look at this picture** to see what I mean. I also tried connecting the power to the pressure sensor and then connecting the output straight into an Analog pin on the Arduino. Even though this exact thing works with an LED attached and outputs the resistance value to the Serial, it doesn't work without the LED.
On a side note, I was wondering if anyone knew if I made this on a larger scale, using a lot of conductive fabric, if it would affect the resistance and the results of this project in any way?
**The picture shows the power going into the fabric from the Arduino through the green wire on the right side. On the left, the long red wire in the return going into the breadboard. The black wire from the breadboard is pinned into Analog0 and the shorter red wire is connected to GND.