README.md

pi-clock

A Raspberry Pi-powered light-based alarm clock for toddlers

Red means stay asleep!

Green means it's time to wake up!

Installation

$ git clone https://github.com/avonmoll/pi-clock/
$ cd pi-clock
$ sudo npm install

(sudo may be necessary if installing directly on RPi)

Usage

Choose one of the following and then navigate to <hostname>.local:3000:

pm2 (Recommended)

Install pm2:

$ sudo npm install -g pm2

Configure startup by running the following and then executing the last line of the output:

$ pm2 startup

Start app and save so pm2 will start the app on reboot:

$ sudo pm2 start server.js -o out.log --name pi-clock
$ pm2 save

cron

The following command adds an entry to the root crontab to run the app on reboot.

$ sudo echo "@reboot root cd /home/<path-to>/pi-clock && sudo node server.js >> log 2>&1 &" >> /etc/crontab
$ sudo reboot

Materials

• Adafruit 7-segment 4-digit LED display with I2C backpack
  • Recommend the white display to avoid clashing with indicator LEDs
• 10mm red LED (note: an additional 100 ohm resistor may be needed in series with one of the existing resistors since I used an LED rated for higher voltage)
• 10mm green LED
• resistors to protect LEDs
• male-female jumper wires
• male-male jumper wires
• breadboard or other perfboard

Tools

• Soldering iron (for the I2C backpack)

Roadmap

References

• Adafruit Learning Series (1-7)
• ApplePi-Baker: create SD cards for RPI from MacOS
• Raspbery Pi Pinout Guide
• 7-segment 4-digit Data Sheet
• i2c Backpack Wiring Instructions

Build & development

Run grunt for building and grunt serve for preview.

Testing

Running grunt test will run the unit tests with karma.

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The web server was scaffolded with yo angular generator version 0.15.1.