# How do you hook the quad relay up to an arduino?

**URL:** <https://community.sparkfun.com/t/how-do-you-hook-the-quad-relay-up-to-an-arduino/38009>\
**Category:** Qwiic System\
**Tags:** qwiic\
**Created:** [October 18, 2019, 1:18am UTC](https://community.sparkfun.com/t/how-do-you-hook-the-quad-relay-up-to-an-arduino/38009 "2019-10-18T01:18:54Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![3n1corp](https://avatars.discourse-cdn.com/v4/letter/3/59ef9b/32.png) [@3n1corp](https://community.sparkfun.com/u/3n1corp)\
**Post date:** [October 18, 2019, 1:18am UTC](https://community.sparkfun.com/t/how-do-you-hook-the-quad-relay-up-to-an-arduino/38009/1 "2019-10-18T01:18:54Z")

</div>

I have searched everywhere and no info is out there. How do I hook up the quad relay to an arduino uno. I can get power light to come on with a wall adap. only Ive hooked up 3v pin and ground to 3v power and nothing. Nowhere does it tell you where to hook anything up. I am not using the qwic jack

---

<div class="post-metadata">

**Author:** ![n1ist](https://avatars.discourse-cdn.com/v4/letter/n/5daacb/32.png) [@n1ist](https://community.sparkfun.com/u/n1ist)\
**Post date:** [October 18, 2019, 12:22pm UTC](https://community.sparkfun.com/t/how-do-you-hook-the-quad-relay-up-to-an-arduino/38009/2 "2019-10-18T12:22:54Z")

</div>

Using the 4 plated-thru holes (either by soldering in wires or header pins) or the qwiic cable [https://www.sparkfun.com/products/14425](https://www.sparkfun.com/products/14425), connect 3.3v, ground, SDA (to SDA or A4) , and SCK (to SCL or A5) on the UNO. Then feed power (7-15v) into the power jack. You can find example code under the “documents” tab on [https://www.sparkfun.com/products/15102](https://www.sparkfun.com/products/15102)

/mike

---

<div class="post-metadata">

**Author:** ![El\_Duderino](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/el_duderino/32/6367_2.png) [@El\_Duderino](https://community.sparkfun.com/u/El_Duderino)\
**Post date:** [October 24, 2019, 10:18pm UTC](https://community.sparkfun.com/t/how-do-you-hook-the-quad-relay-up-to-an-arduino/38009/3 "2019-10-24T22:18:58Z")

</div>

Hi everyone,

Thanks for helping out here Mike. Just for 3n1corp’s information, the [[Hookup Guide](https://learn.sparkfun.com/tutorials/qwiic-quad-relay-hookup-guide) for the Qwiic Quad relay will go over connecting the Quad relay to an Arduino along with plenty of other information including example code.]([https://learn.sparkfun.com/tutorials/qwiic-quad-relay-hookup-guide](https://learn.sparkfun.com/tutorials/qwiic-quad-relay-hookup-guide))