Tagged Questions
6
votes
2answers
329 views
How to start with creating a device?
I have recently wondered if I could build some kind of useful and cool device, using some sensors, transmitting signal and doing something with it - I think people who answer questions on this site ...
4
votes
2answers
225 views
light system for stairs
I have a stair made of several steps. I want that when I put a foot on a step, the light of the next step is turned on. Each light is placed just under the edge of the step. If I use LEDs as lights, ...
0
votes
1answer
102 views
Low Voltage Photosensor
I'm looking for a photosensor/photo IC part (combination of photodiode, linear amplifier, Schmitt trigger and output transistor) that can be powered with 3.3V. Fairchild QSE256/257/258/259 is almost ...
4
votes
1answer
607 views
How to find Emitter and Collector of an LDR
How can we find the emitter and collector of an LDR. I am using it in the following circuit but I don't know how to identify which terminal of the LDR is emitter or collector.
Here it is mentioned ...
3
votes
2answers
2k views
LM358 (Op-Amp) For a Light Sensor?
I'm looking at this light sensor:
What exactly is the point of having an LM358 (a Dual Op-Amp I believe) for a Light Sensor?
Maybe I'm missing something....but what exactly purpose does it serve?
...
1
vote
2answers
130 views
Light sensor plate
Does anything like that exist?:
A4 or bigger sized plate which would with ca. 1 mm precision detect regions of the plate which were covered. So if you place your hand on the plate you will obtain a ...
3
votes
1answer
910 views
What are the relevant parameters for a reverse-biased LED light sensor?
Following this appnote (PDF) on using photodiodes, I'm connecting an IR LED as a light sensor and emitter, configured like this:
To emit light, I pull PIN1 high ...
1
vote
2answers
178 views
Which infrared bulb should I use with a photodiode?
I'm currently using a photodiode (found here) along with the appropriate emitter to send data between mobile robots. I'd like to the sensor to optionally be used as an ambient light sensor using a ...
1
vote
2answers
221 views
IR-near visible light detection
I want to detect light near 10 micrometer wavelength. It seems like photodiodes are mainly targeted for 1 micrometer range. Is there any detector/sensor for 10 micrometer wavelength ?
3
votes
3answers
2k views
How to make a simple daylight on-off switch?
I have a project planned where I want for some LEDs to turn on when it's dark and turn off when it's light. I have some transistors, diodes, and a photoresistor(and of course other basic components). ...
5
votes
1answer
1k views
Measuring light levels with a photodiode and an ADC
I'm trying to use a photodiode to measure light levels via an ADC on an ATMega168. I've got the microcontroller code working properly (measuring values on a pin and reporting it as an led brightness) ...
