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  • Author Author: phoenixcomm
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KY-019 Relay Board Documentation

I picked up a few of these relay modules at my local electronics shop with out any documentation which is par for the course. So here is my swing at it. 

Cris.

 

KY-019 Relay Module is used to control AC circuits, the relay acts as a switch that responds to a signal received from an embedded controller, it has an integrated LED that indicates if the signal is high or low. This device is commonly used in IoT projects to control a 120vac load.

 

Specifications

The KY-019 consist of a 1Mohm resistor, a LED, a 1N4007 rectifier diode and a 5VDC relay capable of handling loads up to 250VAC and 10A.

 

TTL Control Signal5VDC to 12VDC (some boards may work with 3.3).
Maximum AC10A 250VAC
Maximum DC10A 30VDC
Contact TypeNC and NO
Dimensions27mm x 34mm [1.063in x 1.338in]


KY-019 Connection Diagram (Arduino)

For the DC part of the circuit connect S (signal) to pin 10 on the Arduino, also connect the Power  and  to +5 and GND respectively.

AC terminology:

  • Neutral - Never switched your return. (like the ground side of your logic)
  • Hot - Just that this is what goes to your circuit breaker.

So you Neutral line (wire) goes from the source to the device.

and the hotline goes to the Common Screw on the Relay Board

and the device you are going to control connects to the NO Screw on the Relay Board. In this way when your relay is energized

your device will be on.  Just a note if you had used the NC Screw then the device would be 'ON' when your relay was not energized.

Please DO NOT use this to control something in your house. This device is NOT UL rated and can never be wired to a US 15amp outlet! Always be very careful when experimenting with AC, electrical shock can result in serious injuries or death.

 

KY-019ArduinoAC Device
SPin 10
++5volts
-GND
CommonFeed IN
N.O.Feed Out
N.C.n/a

  • in reply to phoenixcomm

    Hello Cristina,

     

    good information. It is really rare I need so much power in my circuits, maybe this is the reason. It is not a question of price but I find Finder relays, all normalized to 8 or 16 pin sockets powered by 5 o 3.3 V with an output control up to 250AC and 10 A. I like them as they are very small. I have used in the Seven Of Nine project (controlled by the PiFace Digital relays that are limited to 30 V and a really low power, as well as in my last project the musical box.

     

    Enrico

  • in reply to balearicdynamics

    hi Enrico

    These relays cost me about 2.50usd each. I also found them on Ali Express for 50 cents each but you need to buy a bunch and shipping is about 1 month I cant use them in the hab AC side as they are only 10amps  and I did not see a UL rating. US wiring codes are basically 14ga for a 15 amp outlet or 12ga for a 20amp outlet.

  • hi Cristina,

    I saw there also here and on Amazon too. What is the cost of this breakout? I always use Finder relays that are very responsive and reliable, made to be switched by logic signals and san fit on sockets, breadboard and more. Cost really few Euros and I found them very reliable. Interesting to compare these small boards.