HomeRaspberry PiRelay Module KY-19 (Songle SRD-05VDC-SL-C)

Relay Module KY-19 (Songle SRD-05VDC-SL-C)

Tech details:

  • Control signal: 5V-12V
  • Current requirements: ~85 mA
  • Max current: 10A/250V AC or 10A/28V DC
  • Response time: 10msec
  • Operating Temp: -25/+70 C

Connectivity:

3 pin connector, pins as follows:

  • GND: 0V Ground
  • VCC: 5V-12V
  • Signal: 5V (see below)

Relay Module KY-19  requires 5V signal to control it. This means that additional circuit is needed to control it through the Raspberry pi GPIO. It is possible to use a transistor to do this. It is possible to control the relay from 3.3V pin, however, depending on the relay module the switch signal may not register. This is mostly an issue due to the current draw. GPIO pins might not be able to provide enough current to the relay. This is especially the case when multiple relays are used.

What does it do?

Relay Module KY-19 is a digital relay module which allows high voltage/current to be switched on or off using circuit-level power. If you wish to control an electric circuit a relay can be used to imitate the mechanism of a manual switch. When a voltage is applied to the module, it allows the flow of the current. This way you can turn on and off various high power devices like lights, motors, appliances.

How to use it?

untitled-sketch_bb
Please note that Raspberry Pi signal wire may require 5V at 80mA

The Relay Module KY-19 has 3 terminals. This is where your high voltage circuit is plugged to. The relay should be connected to the power source (+)  and the device it will operate. Terminals mentioned are labelled as follows NO (normally open) COMM (common) and NC (normally closed).

When a relay is not powered, NC and COMM are connected and current can flow through.  When the relay is powered the connection is made between NO and COMM. You can use the signal pin to reverse the switch at any time by supplying the HIGH/LOW  signal to the board.

Depending on your project, you should consider the Relay Module KY-19 terminals and wiring. This way you can decide if your device will stay powered if the power is cut off from the controlling unit.

Sample code:

You can test the relay using a python2 code from here.

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(2, GPIO.OUT)
GPIO.output(2, GPIO.HIGH)

# main loop
try:
  GPIO.output(2, GPIO.LOW)
  time.sleep(2);
  GPIO.output(2, GPIO.HIGH)
  time.sleep(2);
  print "Works"
  GPIO.cleanup()
  print "Good bye!"

Shop with to support:

client-image
client-image
client-image
client-image
client-image
client-image

Other reviews

NAS at the prosumer level: Synology Diskstation DS418

0
It has been years since I looked at consumer NAS solutions. Turns out the space changed a lot and reasonably priced boxes like Synology DiskStation DS418 have a lot to offer

A much bigger power sandwich: MiniWare MDP-P906

0
MiniWare has released an updated MDP-P906 module for their MDP-XP series that brings 300W in an incredibly small form factor!

I changed my mind about GravaStar Venus

0
I looked the the product pictures not sure what to make out. When I finally got Gravastar Venus speaker in my hands I changed my mind.

Shellbot SL60 knows where you left your socks!

0
Shellbot SL60 knows exactly what you left on the floor. It won't just avoid it, but will also let you know that you are messy!

CZUR Aura Pro: 15 years too late to the party

0
Making a great device doesn't guarantee success. Is CZUR Aura Pro able to fulfil its niche and cater to customers?

Imou Cruiser 4MP: CCTV outdoors

0
Designed for the outdoors, Imou Cruiser 4MP brings excellent connectivity options alongside increased resolution and enhanced night imaging.

Sonoff, what were you thinking? Sonoff Cam Slim

0
Sonoff Cam Slim looks great and feels great in your hand, but what Sonoff was thinking? These limitations will make everyone angry!