Close
0%
0%

Control Snap Circuits Relay With Kano Computer

How to control a relay with the Kano Computer (Raspberry Pi)

steve-schulerSteve Schuler
Following
Liked Like project

Just one more thing

To make the experience fit your profile, pick a username and tell us what interests you.

Pick an awesome username
hackaday.io/
Your profile's URL: hackaday.io/username. Max 25 alphanumeric characters.
Pick a few interests
Projects that share your interests
People that share your interests

We found and based on your interests.

Choose more interests.

OK, I'm done! Skip
Similar projects worth following
2.7k views
8 comments
717 followers
View Gallery
A simple circuit to control a Snap Circuits relay with the Kano Computer (Raspberry Pi). The Scratch program is for an intermittent fan. Intermittent fans are used for ventilation, for instance in your kitchen or bathroom, where the fan simply needs to be on a timer. You might switch the fan on and then forget to turn it off. So, you can preset, say, the bathroom fan to switch off after thirty minutes. The Scratch program switches the fan on for a few seconds, then switches it off for a few seconds, and this process repeats ten times.

Follow me on Twitter: @SteveSchuler20 and right here on Hackaday: KRA5H

This circuit is similar to my project, "Variable Speed Fan: Snap Circuits, Kano Computer" (control a variable speed fan with the Kano Computer), but instead of controlling a motor with the Kano Computer, I'm controlling the Snap Circuits relay (which in turn controls a motor). For some background on this circuit, see the following projects:

Variable Speed Fan: Snap Circuits, Kano Computer

The Diode

Snap Circuits Relay

Initially I used pin 11 (GPIO17) on the Raspberry Pi to try to switch the relay on and off, but unfortunately all I heard was a faint clicking from the relay. Pin 11 just didn't supply enough current to switch the relay on. Pin 2 is 5V and also supplies enough current to to switch the relay on. So, I used pin 11 to switch the transistor on and Pin 2 to power the relay.

I used the Snap Circuits to header pin connector that I created to connect the circuit to pin 9 (Ground) and pin 11 (GPIO17) and made a second Snap Circuits to header pin connector (my cat got a hold of one of my Snap Circuits Jumper wires and chewed through it so I was able to put it to good use after all).

To make the wire I used a header pin jumper wire, Wire Glue, the salvaged Snap Circuits jumper wire, and shrink tubing:

And connected it to pin 2 on the Raspberry Pi

Intermittent Fan Scratch Program

Project Build

The Raspberry Pi pin 9 (Ground) is connected to the NPN transistor (Q2) via the black/black jumper wire and pin 11 (GPIO17) is connected to the 1K resistor (black/red jumper wire). Pin 2 (5V) is connected to the Snap Circuits relay (S3) via the blue/red jumper wire (and the 2-snap conductors).

Where to get the Kano and Snap Circuits:

Kano Computer website: http://us.kano.me/products/kano-kit
Snaps Circuits (individual parts or whole sets): http://cs-sales.net/sncirepa.html

Teaching programming and Electronics with Snap Circuits and the Kano Computer PREVIOUS ARTICLE

  • 1 × Kano Computer/Raspberry pi
  • 3 × Custom made Snap Circuits to header pin jumper wires
  • 1 × Base Grid (11” x 7.7”) # 6SC BG
  • 1 × Diode 1N4001 # 6SC D3
  • 1 × Battery Holder (2-AA) # 6SC B1

View all 13 components

View project log

Enjoy this project?

Share

Discussions

Steve Schuler wrote 12/14/2016 at 13:35 • point

Thanks, Adam, for liking my project!

  Are you sure? yes | no

Steve Schuler wrote 12/12/2016 at 18:23 • point

Thanks, Dan, for linking my project.

  Are you sure? yes | no

Steve Schuler wrote 06/06/2016 at 20:44 • point

Thanks, udiggity, for liking my project!

  Are you sure? yes | no

Steve Schuler wrote 06/06/2016 at 12:16 • point

Thanks, Stephen, for liking my project!

  Are you sure? yes | no

Steve Schuler wrote 06/06/2016 at 12:14 • point

Thanks, Mehdi, for liking my project!

  Are you sure? yes | no

Steve Schuler wrote 05/11/2016 at 11:10 • point

Thanks, Paul, for liking my project!

  Are you sure? yes | no

Steve Schuler wrote 05/05/2016 at 15:55 • point

Thanks, Don, for liking my project!

  Are you sure? yes | no

Steve Schuler wrote 05/05/2016 at 12:01 • point

Thanks, Maulin, for liking my project!

  Are you sure? yes | no

Similar Projects

Our first General Electronic project involving an integrated circuit mounted onto a breadboard, making a digital binary counter circuit.
Project Owner Contributor

2-bit Binary Counter Project

electorialsElectorials

I replaced the WiFi SoC in my Wemo smart plug with a Moteino µC
Project Owner Contributor

Gutting a Belkin Wemo

gigawattsGigawatts

Did you run out of input pins, don't worry here is a solution without any ICs.
Project Owner Contributor

100+ Switches in a Single Pin of Arduino

najadNajad

In this tutorial, you will learn how to interface a single-channel relay with an Arduino Nano.
Project Owner Contributor

Interfacing 12V Single Channel Relay Module with A

akshay-jainAkshay Jain

Does this project spark your interest?

Become a member to follow this project and never miss any updates

By using our website and services, you expressly agree to the placement of our performance, functionality, and advertising cookies. Learn More

Yes, delete it Cancel

Report project as inappropriate

You are about to report the project "Control Snap Circuits Relay With Kano Computer", please tell us the reason.

Send message

Your application has been submitted.

Remove Member

Are you sure you want to remove yourself as a member for this project?

Project owner will be notified upon removal.