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, …
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 …
photoresistor - Dark sensor with transistor - Electrical Engineering ...
Jul 12, 2021 · Why do most of dark sensor circuits in the Internet look like this? It seems to me that in such circuit, photoresistor doesn't limit base current and it doesn't work. I think that photoresistor sh...
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 …
transistors - Tuning photoresistor circuit with resistors - Electrical ...
Sep 11, 2023 · Tuning photoresistor circuit with resistors Ask Question Asked 2 years, 2 months ago Modified 2 years, 2 months ago
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.
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 …
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 …
Reading From a Large Array of Photoresistors
Dec 15, 2011 · I'm an undergrad just starting to study Electrical Engineering. For the first hobby project I'm starting, I want to use a microcontroller to read analog voltage values from a very large array of
Why do LDR photocells use CdS and CdSe?
May 28, 2019 · Probably because their peak sensitivity wavelength is close to that of the human eye and they do, overall, do a reasonable job of approximating human sensations of brightness. (Silicon is too …