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Hi Brad, I watched your videos about Pi Pico. I teach microPython to kids in Poland. Thanks to these videos we are also learning English together, because your message is concise and clear. Thank you and I look forward to your next productions.

Excellent video, thank you!

Thank you for this video sir it so related for what im seaching. Can i use this board sir from audio out of the cctv camera so that i can trigered 24 volts alarm and lights from the output of module thank you

what if its a 2 pin pot?

Very good treatment of hard-to-find info! On "Relay Module One" and connecting a/the GPIO Pin to VCC so you can have the relay turn on when the GPIO pin is HI. (starting at around 5:30): Nice for modules with only one relay. But my multi-relay modules only have one VCC pin.

Best explanation I've found for the relay module. You covered the technical stuff in depth without over-complicating it. You covered the traps well, which was what I was wanting to know. I've worked with relays in industrial applications, so I had my suspicions about the jumper. Thank you for confirming the internal circuitry on this.

Is it okay to use the relay with the high and low switch with an external 5v power supply while sharing the ground from the relay/power supply and microcontroller. Im trying to connect my xiao rp2040 which is 3.3 volt and a 5v 30a relay.

Great video Brad. Thanks. I was really struggling trying to understand how the jumper in the Relay Module Two unit actually worked. I didn't realize that the optocoupler input was bi-directional. I know this video is a few years old and that most of those watching aren't going to build their own circuits from this tutorial, but I think there is an issue with the circuit diagram for the Relay Module Two. I'm pretty sure that you need a resistor between DC+ and the optocoupler or the optocoupler will sink as much current as DC+ will give it, causing it to burn out. I know there is one in the actual unit.

Just came back to give you a like and subscribe. Great content.

fantastic explanation for a noob like myself! Thank you for sharing.

thanks bro

This is awful technical. I just need the relay to switch from a solid state switch to fire a motor

I have been looking for exactly this! Thanks for making this.

Very well explained. Thank you for posting this video.

I believe your "Relay Two" schematic is wrong. The optocoupler is open-collector and the way you have drawn it you are shorting the 5V to ground when optocoupler transistor turns on.

This is a great video...question...is there another way to set the relay from input low to input high?, the option you mentioned would only work with a single relay board, i'm using a dual relay board. already try to set the output GIO pin to high but it did not work... thank you

It works when I did with external supply , helps a Lot

I hate active low modules 😂

Good 👍

helped a lot with my project thanks

Amazing explanation, after viewing, rushed to watch for more of the similar explanations and... daamn

This is a high-quality educational video. It is unique in the sense that it describes the physics inside the relays. In addition, it shows three different ways of connecting the relay module at 3:31, 5:10 and 5:52. Thank you very much for the video.

Very good explanation

I have the red relay. I'm trying to figure out how to get it to replace the trigger on my plasma torch for CNC use. I have the MKS DLC 32 control board. The instructions suggest I use the spindle output as the trigger source. The debt connection is 24 volts since it outputs whatever the power supply is. I just want to use that 24 volt spindle connection to trigger the relay which will finalize the wire connection to the plasma machine. Can you tell me how to do it in terms that a caveman could understand? Thanks. There's two wires that travel from the plasma machine to the trigger on the torch handle. Squeezing the trigger simply closest the connection. That's all I'm trying to do.

thank you, great explanation of various module type and it circuit schematic

Thank you for the excellent and clear explanation. Regarding relay module two, would it be possible to isolate relay and signal power by discarding the jumper and applying DC+ to the DC+ terminal for the relay coil (or the LOW pin of the 3 pin jumper) and signal power to the middle pin of the three pin jumper (either DC- or DC+ depending on whether we want to trigger high or low). Edit: I tried it and it works!

nice

nice.. do you have circuit diagram of this?

I have a dso with a frequency of 100 MHz, and I use Thonny IDE and Micro Python with a Rp2040 system clock of 125 MHz. I also know the pwm frequency, which is 62.5 MHz. I have to make a pwm in an RP2040 at 50 MHz, thus here's my code: from machine import Pin, PWM import time pwm_pin = 0 pwm = PWM(pwm_pin) pwm.freq(1000000) # Set PWM frequency in Hz # Set fixed duty cycle pwm.duty_u16(32768) # 50% duty cycle (32768 out of 65535) I want a square wave, however the PWM produced noises and ripples with this code. Thus, how can I lessen the noise and ripples? help me sir

Really helped out a lot with the internal pullup, forgot to wire it in and boom! saved by the code

Thanks for your video. Excellent explanation.

Nicely done... Thanks.... What is the highest freq Pico can go... ? And how do u provide a delay in bw two PWM signals

Cách ly mà dùng chung mass ?

im still confuse..idk which is the problem..if it is, the code, the connection, the relay...its like the permutation on my situation, figuring different combination of trials..im giving up

either NPN or PNP will work for me switching RF signal inputs and outputs

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This is the best explanation of relays that I have ever encountered for so long. Thank you so much sir for this.

This was a really clear video, well-explained. In particular, I was interested in understanding what JD-Vcc was doing and why the jumper is there/not there. Thank you.

Thank you for the video Brad! I'm wondering if I can use a single power supply to power both the relay coils (JD-VCC jumper removed) but also the arduino. I guess technically the arduino wouldn't be completely isolated from the coils BUT at least the coils would be getting their power straight from the power supply instead of possibly overloading the VCC pin on the arduino right? I'd also like to know if I could possibly go a step further and use that same power supply to also provide the power on the relays themselves (only intending on turning on 5mm LED's) so basically I'm trying to use a single power supply to power the arduino, the relay coils, and the LED's connected to the relays. Starting to think maybe I could've just gone with a different module like something using mosfets? Still kind of a beginner so any suggestions are welcome! Thanks for your time!

Hi, please, can you get a 5VDC output? i want to use this as a safety relay so i want 5VDC in, 5VDC out

I've been trying to find a good explanation of how to wire these relays, the 3 pins on the load side confused me, but you cleared it up really nicely. Thanks!

After I destroy 2 esp32 boards, luckily I found this to let me not third boards. It may draw to much current by coil to wreck them before I test any project.

Thank you for this video! Every other video I've found has only explained how to plug in a couple wires. You actually explained how things work and why they're set up in a certain way, which is exactly what I needed. Thank you!

All my comments based on Relay Module One. Tks.

good

Thanks for knowgable video sharing.

Superb. Thank you!

Thanks for the video, very informative. I would have liked to see the optocoupler based relay driver schematic with component names and values so that I could have tried making my own in a custom PCB.

Dude, I was totally confused about these relay modules. I wish I had seen this before I bought some. Anyway, thank you. [Click -> Subscribed 😀]

Nice video, thanks :)