photodiode - Understanding basic photoresistor circuit - Electrical ...
May 10, 2019 · I built a working sensor using the arduino starter kit photoresistor (datasheet) using a 10kOhm resistor and a 5V source but want to understand it better. Edit: afer helpful …
What colors or wavelengths are photoresistors sensitive to?
Oct 15, 2020 · A photoresistor's sensitivity is a byproduct of the chemical used to create it. This one, a CdS cell, peaks around 545 nm wavelength, which means it is much more sensitive …
Why do I have to use an additional resistor with a photoresistor?
I mean, photoresistor is already a resistor, why do we have to decrease the voltage in the circuit with an additional resistor? Thanks in advance for your answers.
Using op-amps to read real-time resistance values over a wide range
Jul 29, 2019 · Question Now I need to measure the real-time resistance change of the photoresistor over a larger resistance range (1k to 100M). Is there a way to improve this …
Light Dependent Resistor Photoresistor LDR: gl5516 vs gl5506
Sep 30, 2017 · The GL5506 has a significantly lower resistance for a given amount of light compared to the GL5516 AND, in dark conditions the resistance of the GL5516 is significantly …
Photo resistor is giving off an unsteady output, how can I fix that?
Apr 1, 2018 · Without the fixed resistor, the 5V going into the photoresistor has nowhere to go other than the analog input pin, so you'd read 5V regardless of the light level. The variable …
How accurate is a photoresistor? - Electrical Engineering Stack …
Oct 1, 2015 · I'm doing a school project in which I need to measure the amount of light emitted by a specific object. The first thing that came to my mind was to use a photo resistor hooked up to …
sensor - How to make a simple daylight on-off switch? - Electrical ...
Dec 14, 2010 · Tie your photoresistor from the positive side of the power supply to the wiper on the variable resistor. That way the variable resistor will change both the charge time and the …
Basic circuit to keep LED either on or off depending on night/day
10 You need the LED to be lit when the photoresistor is high resistance. So replace the photoresistor with a fixed resistor R3, to supply the base current to turn the transistor on. Then …
How fast is a photoresistor? - Electrical Engineering Stack Exchange
Nov 8, 2020 · I just set up a cheap photoresistor from a starting kit in a voltage divider circuit with a 10 K resistor and sent the registered pin voltage to a computer using USB. The first figure …