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 with Green, …
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.
How fast is a photoresistor? - Electrical Engineering Stack Exchange
Nov 8, 2020 · 5 As an addition to the other answers, typical CdS photoresistors have their maximum sensitivy at green light and nearly none for red and infrared. Also, their sensitive area is very uneven …
Light Dependent Resistor Photoresistor LDR: gl5516 vs gl5506
Sep 30, 2017 · Light dependent resistors (LDRs) today are not that complicated. Designed originally to help count "bottles and/or cans" passing by a moving flow at production factories, they soon lost …
How accurate is a photoresistor? - Electrical Engineering Stack Exchange
Oct 1, 2015 · How accurate is a photoresistor? Ask Question Asked 10 years, 2 months ago Modified 10 years, 2 months ago
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 you need the LED …
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 circuit, to be able to measure …
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 comments, this …
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 resistance of the PR …
Choosing resistance in series with a photoresistor for best light ...
Mar 31, 2016 · simulate this circuit – Schematic created using CircuitLab I have a photoresistor, R1, and as a voltage divider a fixed resistance, R2. There is a voltage of 5V over these two, and the …