Questions tagged [opto-isolator]
The opto-isolator tag has no usage guidance.
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Resistor - Correct value for optocoupler, but dont have that size
I am making a shutter for my camera using a Arduino and an optocoupler.
I understand most of most parts, but unsure about the resistor because I don't have the correct size. 5V will be coming from the ...
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Read encoder output by using an optocoupler
I have a 512 pulses encoder with four wires: +5V, ChannelA, ChannelB, GND and I'm using it as feedback for my motor position (max 80 RPM) on Arduino UNO. Everything works fine, but I need also to ...
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How to debug MIDI input?
I'm trying to receive MIDI messages on a Leonardo. To do that I used the circuit in the diagram below (only the top half for receiving). The only thing I did differently was using an 1N4148 diode ...
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Detect if laptop is on or not?
How would I safely connect an Arduino so that it can detect if a laptop is on or off?
The Arduino would be powered separately by a normal USB charger, since it needs to be turned on even when the ...
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Normally-Open opto-coupler board
I'm looking for a Normally-Open optocoupler board for arduino. I need to control power of a device (DC 12v, 500mA).
I tried to use TLP281 board, which works, except that it inverts the output: device ...
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How do I properly receive MIDI with Arduino, with 6n138?
UPDATE : I still can't receive MIDI as of 2019/07/01.
Here goes so far : I'm trying to follow this schematics from instructables, using 6N138. To make it easier, I'm going to copy his schematics.
=...
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How to prevent optocoupler to activate when resetting the arduino? [closed]
From various example on how to use optocouplers ( eg 4N25) I gathered that they
work in inverted way meaning that for the optocoupler to output a signal,
the input LED must be OFF.
This is very easy ...
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Connect optocoupler 4N35 to Arduino Uno to control LED light strips
I want to use an Arduino Uno to control the LED light strips, based on the input signal from a robot controller. The robot controller sends a digital signal with "HIGH" of 24 V and "LOW" of 0 V. I ...
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ATtiny85 MIDI IN with less than 3V -can it be done? [closed]
I've been trying to add a MIDI INput to an ATtiny-based synthesizer, powered by a CR2032 battery (3v) and running softwareSerial.
Currently I'm using an H11L1 optocoupler, which works fine at 5v, but ...
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Arduino and Optoisolators
I am looking for an efficient (and safe) way to use the Arduino to switch a higher voltage device off and on. The first option would be a relay, but they are fairly bulky. I was wondering if I should ...
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H11L1 opto isolator does not pass signal to Arduino (correctly)
I have made a very basic test circuit for the opto coupler H11L1 ('similar'datasheet: http://www.datasheet4u.com/datasheet/H/1/1/H11L1_MotorolaInc.pdf.html))
I use the test circuit:
simulate this ...
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