|
- What colors or wavelengths are photoresistors sensitive to?
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, Green-Yellow light than it is UV Violet Blue or Red IR
- 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
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 because of the electrode meanders That makes pairing a red, bundled light source as a typical laser diode and a typical photoresistor a very bad choice
- Light Dependent Resistor Photoresistor LDR: gl5516 vs gl5506
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 favor as the light which would trigger the counting reacted to reflections off of the line being counted Audio response loudness detection is but one use for LDRs over the years As of the 1970s, being paired
- 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 to turn off when the light shines, and the photoresistor is low resistance So connect the photoresistor from base to ground
- How accurate is a photoresistor? - Electrical Engineering Stack Exchange
How accurate is a photoresistor? Ask Question Asked 10 years, 2 months ago Modified 10 years, 2 months ago
- Using op-amps to read real-time resistance values over a wide range
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 the dynamic resistance values of the photoresistor over at least five magnitudes (1k to 100M)?
- photodiode - Understanding basic photoresistor circuit - Electrical . . .
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 question is basically: a) what is the difference between a photodiode and -resistor b) why does a voltage divider need 2 resistors
|
|
|