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DONGKER Optocoupler Isolation Module
WHY CHOOSE DONGKER Optocoupler Isolation Module？
- 3-Channel Optocoupler Isolation Module AC 220V Testing Module No PCB Holder .
- Function: test whether AC 220V is existed;when there is 220V,optocoupler can be conductive to ground;otherwise,it is not conductive.
- Output High/Low Level:can directly connect with SCM IO interface to test,voltage is 3-5V.
- Adaptive to connect with PLC,compatible to almost all PLC input.
Ben Sangtrash
2025-07-13 10:31:30
I expected to replace the main resistors with a lower value to make these work on 120v. To my surprise, this operates perfectly well on 120v. In fact, I put it on my variac, and found that these turn on very decisively at a mere 20v! Which actually concerned me for my project, because I'm using it to sense a generator being started, but it turned out to not matter in my case. But keep it in mind for yours! I think they work so well because the low voltage side has a transistor that must be quite sensitive. I've seen other voltage sensors like this that do not have the transistor, and use the optocoupler's output directly to make the logic on or off output. It's nice that this module has two LEDs for each segment. One for the high voltage side and one for the logic side. The HV side green LED lights very dimly on 120v, but the little red logic one always decisively comes on full strength at any input above 20v. Actually it's great that I didn't need to change the resistors, because they will run super cool on 120v. I've heard the big resistors usually cook themselves to death in long service, but that should not be an issue with these on 120v.I did some experimenting and found that if you put a 2k resistor across the input side of the optocoupler, it would take it down enough to only activate the logic side at about 90v. Since I found out my application didn't need the accuracy, I went no further. Tacking a resistor there would not be very easy, but still possible if you really need to.So far I'm very pleased, mostly because I did not need to do any modifications. I'm not terribly concerned about longevity. In my application, these will be very understressed, being on half their rated voltage for perhaps 10 minute cycles an hour apart, maybe for 4 cycles a day for a couple weeks of the year. But they seem built well enough. It's all through-hole components and there is good separation between the high voltage and logic sides. Also the mounting holes are in decent places, at the four corners, well away from any components.I used this with an Arduino Uno with 5v logic. Bear that in mind, because I don't know how well it will work on 3.3v logic. I think these are logic low (ground / 0v) when input voltage is present. Can't quite remember, but that seems like what the description says, don't have it here at the moment. This also has a resistor network to pull the logic outputs high when there is no input voltage present. Which is nice.Overall pleased. Works for me. Hope my review will help you.
Freddie
2025-05-13 15:18:58
To add to Ben's review, which is pretty good and provides a lot more info than I need for my use case:Yes, I can also confirm it works with 120v on the high voltage side despite what the listing says. The low voltage output is indeed active low, which isn't a big deal, but maybe a bit confusing if that's not what you're expecting. To be specific, when there's high voltage input the low voltage output basically drops to zero. When VCC is 5v and there's no high voltage, it outputs about 3.6v on the low voltage side. When VCC is 3.3v and there's no high voltage, it outputs about 1.8v on the low voltage side.Just hooked it up to a ESP8266 (which uses 3.3v for GPIO) and it seems to be working perfectly. Much much faster than the separate USB power supply I was using before that lingered for a couple of seconds before the ESP could detect that it lost power.
Ray Benefield
2025-02-06 17:25:43
Works exactly as described. Used to convert 110V A/C signal to 3.3V DC signal attached to GPIO pin on microcontroller. PCB Isolation between high voltage side and low voltage side is cleanly designed. PCB connections are clearly labeled. Mounting holes are positioned with plenty of clearance for mounting hardware. Like the LEDS which indicate which channel is active. High side LEDS are green, low side LEDS are red.
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