The photoresistor tag has no wiki summary.
4
votes
2answers
313 views
Basic circuit to keep LED either on or off depending on night/day
How can I have a LED either on or off (not in between) depending on night or day with basic electronics? I have created the circuit below, but it only shines and in darkness it dims.
The ...
1
vote
2answers
201 views
detect a change in state of voltage divider without using ADC
I am using a photoresistor for a laser trip wire setup to detect motion.
I am a little short of adc channels here so would like to use a simple GPIO to read the state of the photoresistor ckt.
I am ...
2
votes
3answers
297 views
Whats up with my photoresistors! (Wonky readings, non-stable, I'm missing something)
I'm working on a photoresistor array with my arduino, and I'm having a little trouble getting stable readings.
I'm driving 7 rows one at a time with arduino's digitalWrite(pin,HIGH) command and ...
10
votes
2answers
722 views
Not sure how to name what this resistor is doing?
I have a basic circuit that uses a photoresistor powered by a five volt source. I had made this project to show my son about various sensors and had used a circuit I had found online. It looks ...
1
vote
3answers
379 views
Reading From a Large Array of Photoresistors
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 ...
1
vote
2answers
189 views
Do LEDs Need UVLOs (Undervoltage-Lockouts)?
I'm currently working on a project involving (I think 3mm, 1.5VDC) Infrared LEDs. However, due to my photoresistor, I think the current, voltage, or whatever (forgot) will vary greatly to minuscule ...
-1
votes
3answers
1k views
Zener Diode for Minimum Voltage Regulator
I forgot the name of it, but I remember one post where it said that you can use a zener diode as a "minimum voltage regulator". I don't think I used the right term for it, but here's what I'm doing. ...
2
votes
2answers
605 views
I want to build an interactive LED Table. What are my options for a controller?
I have seen a couple of videos and instructables where people have created a matrix of LEDs controlled by photodiodes/photoresistors inside coffee tables, so that when you put your hand over the table ...
3
votes
2answers
233 views
Light detector linearity with varying wavelength
Given the same intensity of light, in varying wavelengths, which is typically more linear with their output: Cds (photo resistor) or a Photo transistor?
I would assume that the junctions in the ...
