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 …
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 · 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 …
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 …
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 …
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 …
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 …
sensor - How to make a simple daylight on-off switch? - Electrical ...
Dec 14, 2010 · If you use the photoresistor in a voltage divider (i assume you know what that is) to supply the base current of the transistor, you can achieve your aim. When the resistance of …
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 …
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 …