I’m trying to wire my photon to the relay here: http://www.amazon.com/SunFounder-Channel-Shield-Arduino-Raspberry/dp/B00E0NTPP4/ref=sr_1_1?ie=UTF8&qid=1445489474&sr=8-1&keywords=sunfounder+relay -I wired the VIN to jv-vcc (took the jumper out first) -Wired 3V3 to VCC -Wired GND to GND -Wired D0 …

Try leaving the Jumper on JD-VCC + VCC and connect: VIN --> VCC GND --> GND D0 --> IN1

This is a 5V relay shield so you should wire Vin (on the Photon) to Vcc rather 3V3 to Vcc. But given the possible draw of 2x 20mA I’d even power both - the Photon and the relay - from an external 5V supply, instead of powering the relay off the Photon.

ScruffR is correct. I used the same relay module and had the same problem as the OP. Wiring both to external 5VDC solved it.

I tried that method and it doesn’t seem to work at all.

So to clarify, I need to leave the jumper off. Power the Jv-vcc with an external power source, wire the VIN -> VCC. GND -> GND and let D0 hook up to IN1 right?

So you left the jumper off then? Can you walk me through how you wired yours?

Check out this discussion :wink: Hooking up the spark to arduino relay shield

See that’s the discussion I originally read and he doesn’t use an external power source. He just wires VIN to Jd-vcc, 3v3 to vcc and so on just like how I had it. I get the LED light on but no opening/closing. Think I might have a defective relay or something.

To check if your relay is actually working you can just wire Vin <-> Vcc and GND <-> GND and Jumper Vcc-JD_Vcc (this jumper just bridges the Vcc through to the relay coil - with it open you can seperate electronics and coil supply) - no other pins on the Photon. And then just use a jumper wire to b…

I wired a 5VDC power supply to both the VIN on my core and to the VCC input on the relay module. GND to GND. D2 of the core to one IN on the relay. I left the jumper installed to connect the two sources on the relay. Setting the D2 output low turns the relay on (active low). I hope this helps.

Can't get relay module to work properly

Hardware

ScruffR October 22, 2015, 3:13pm 8

Check out this discussion

Hooking up the spark to arduino relay shield

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Can't get relay module to work properly

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