Hello AAC,
Extremely fortunate I found this forum.
I am working on a project where I need to change the brightness of an LED on a breadboard by changes in the environment. It is sort of a bunch of little projects. One of which where I have a light sensor that depending on the light entering should brighten or dim the LED. The other is the same thing, but with a thermistor. The project consists of using a 9 V DC source, resistors, and wires.
I have been able to get my LED to turn off completely or turn on by using the light sensor. But the thermistor is giving me problems. I believe the problem lies in the varying resistance of these devices.
For the light sensor, when I shine my laser on it the resistance is just shy of 200 ohms. When I cover it up, it goes up to 40,000 ohms. So the LED reacts really nice to these big changes in resistance.
For the thermistor, in room temperature it is around 10500 ohms. When I blow on it, it decreases to 9500 ohms. When I put a lighter next to it the change is weirdly 100-200 ohms at most. These small changes in resistance is not enough for the power of the LED to change enough to make any visible changes with my current configuration. Does anyone have any tips for me to make my circuit more sensitive to small changes in resistance so my LED can react to these changes in temperature?
Kind Regards,
Jacob
Extremely fortunate I found this forum.
I am working on a project where I need to change the brightness of an LED on a breadboard by changes in the environment. It is sort of a bunch of little projects. One of which where I have a light sensor that depending on the light entering should brighten or dim the LED. The other is the same thing, but with a thermistor. The project consists of using a 9 V DC source, resistors, and wires.
I have been able to get my LED to turn off completely or turn on by using the light sensor. But the thermistor is giving me problems. I believe the problem lies in the varying resistance of these devices.
For the light sensor, when I shine my laser on it the resistance is just shy of 200 ohms. When I cover it up, it goes up to 40,000 ohms. So the LED reacts really nice to these big changes in resistance.
For the thermistor, in room temperature it is around 10500 ohms. When I blow on it, it decreases to 9500 ohms. When I put a lighter next to it the change is weirdly 100-200 ohms at most. These small changes in resistance is not enough for the power of the LED to change enough to make any visible changes with my current configuration. Does anyone have any tips for me to make my circuit more sensitive to small changes in resistance so my LED can react to these changes in temperature?
Kind Regards,
Jacob