Hi Guys, This is my first time here and I am really not sure about the rules and things. So I am planning to control a light switch using the photon,so I am using a single channel relay and I have connected it to ground and connected the vin of the relay to 3V pin,And the terminal pin of the relay…

try moving the red power line from 3V3 to VIN (5Volts coming from USB)

I tried doing it Then always the red one is on,No matter i change D& low or high

on the relay, black is GND I can see that… what does the middle (orange) and the other side (red) say on the relay? is your relay ACTIVE HIGH (actuates when signal pin is brought to ground) or ACTIVE LOW (actuates when signal pin is brought high)?

VIN- Red In1-Orange GND-Black my relay switch gets on when i supply a low voltage to the orange wire

Can you post stripped down example code?

int led1 = D7; void setup() { pinMode(led1, OUTPUT); pinMode(led2, OUTPUT); } void loop() { digitalWrite(led1, HIGH); delay(5000); digitalWrite(led1, LOW); delay(5000); }

perhaps the pin D7 is not providing enough delta in voltage? Did you try another pin that has no LED and corresponding resistor attached? Can you manually connect the orange lead to GND and make it actuate when you are powering from VIN?

yes I have tried all pins individually to see wether there is a voltage problem,Yes when the orange is connected to the ground the relay works perfectly. I have attached no resistor,should i attach one

I found what I believe to be the relay board you are using, the HL-51. How can they possibly sell a relay board like that with free international shipping for US$0.89? Yes, 89 cents! Unfortunately, the eBay seller didn’t link to the schematics or specs, so that wasn’t that helpful in this case.

Do you say its a bad relay or what. I tried this with an Arduino Uno it works perfectly

Relay not working with Particle photon

General

will April 4, 2016, 2:55am 23

@nilesh please be very careful if you are a beginner working with AC or mains electricity. As @BulldogLowell mentioned, if you have a transistor you can use a digital pin like D6 or D7 to activate it and pass a 5V signal from V_USB to the relay.

Another relevant thread for you:

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Issue driving a 5V relay from Photon Troubleshooting photon	20	3863	October 3, 2019
Relay with Particle photon Hardware	4	3487	April 4, 2016
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Relay not working with Particle photon

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