Questions tagged [light-sensor]
A passive device that converts light photons into an electrical signal output. Examples include photodiodes and photo transistors.
171 questions
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How can I find a comparable (CdS?) photoresistor to replace this Konica Auto S2 light meter cell?
I initially posted this to the photography Stack Exchange site, but I was recommended to post to a more electronics-focused forum. I'm trying to fix up the light meter on a Konica Auto S2 rangefinder, ...
1 vote
2 answers
120 views
Which phototransistor should I use in place of this one?
I'm trying to recreate this project here: https://github.com/LrFranca/DIYcolorsensor It's a really cool color sensor. Here's how it works: Sequentially pulses RGB LEDs Measures reflected light with ...
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2 votes
4 answers
941 views
How to increase the range of a DIY Infrared sensor?
I am working on a small project to light up LEDs in a corridor at night. For this purpose, I'm using an IR sensor that I made myself with 1 TL072 opamp. 1 IR LED out of a smoke detector 1 Photodiode ...
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Arbitrary waveform generator in Multisim
I am building a PIN diode circuit to detect light signals. Currently, I am using a square wave as an input but would rather use an arbitrary wave to imitate light better. Is there a circuit that can ...
2 votes
2 answers
297 views
Low power light sensor for power latch circuit
I have a microcontroller that needs to be powered ON only when there is light in the ambient, otherwise it should stay OFF. To achieve this I use the power latch described here and a simple light ...
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1 answer
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How can we improve this motion detected ambient light sensor circuit?
It's a motion detected ambient light sensor (although we haven't gotten to the motion part). We also have issues towards supplying enough volts towards potentiometer through output of comparator 2 ...
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2 answers
64 views
Is it possible to replace the colour sensor in a Spike Prime colour sensor?
Based upon this post internals of spike prime colour sensor, is there an RGB sensor that I can replace the TCS3472x (unknown on which option) sensor present in the colour sensor with? If so, is it ...
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1 answer
191 views
Why does TCS3200 lose accuracy when the light source is too bright?
I have a custom proof-of-concept project to detect fluid color within a PVC tube coming out of a patient's brain and turbidity (a reduction in light passing through) using an Arduino micro, a TCS3200 ...
1 vote
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116 views
Dark current in InGaAs vs Silicon CMOS camera sensors
It is well known that thermal vibrations may excite electrons across a bandgap in a photo-detecting material, and thus generate photoelectrons even when no incident light is incident. When imaging, ...
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2 answers
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Solar emergency LED Night light control design: Solar panel, 5 V : 3.7 V 18650 Li-ion or similar as Vref. No negative voltage. Only GND. Which Op-Amp?
Solar charging daytime with 0 V battery output to micro LED chain. At nightfall, solar voltage drops to 0, activating Vout: 3.7 V or alternative Lithium chemistry to power 30 ft (100×) white LED rope ...
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1 vote
3 answers
635 views
Photodiode Circuit Output Saturating to 0V. Is there a way to salvage these boards?
My colleague and I recently designed and ordered a PCB intended to capture red laser light using a SFH2440 photodiode. We used the analog devices photodiode circuit design wizard to design the ...
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Can I use a handheld spectrophotometer to calibrate my TCS3200-based fluid color assessment system?
I'm trying to build a system that measures color and turbidity within the tube that exits a patient's brain. Using a TCS3200 sensor and an Arduino micro, and a custom-made housing to ensure a dark ...
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1 answer
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What component is missing?
I have an address sign that is supposed to light when it gets dark outside. The issue is the photodiode (assume that's what the part is) is broken and has broken off the board. I have tried connecting ...
1 vote
1 answer
117 views
Wiring multiple photoelectric sensors to RPI 4
I am relatively new to using Raspberry Pis and wiring sensors. I am trying to wire the PM-U25 photoelectric sensor to a Raspberry Pi 4 to act as an optical resolver that tracks a shutter wheel on a ...
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1 answer
356 views
Short address DALI-2
I'm trying to write a complete algorithm for assigning short addresses to input devices on a DALI bus. At the start I don't know how many input devices are installed on a DALI bus. The procedure in ...