Kinderampel

Kid friendly alarm clock resembling a traffic light.

To Run:

1. Clone the repo and cd kinderampel
2. Set target e.g. export MIX_TARGET=rpi0
3. Install dependecies mix deps.get
4. Create firmware bundle mix firmware
5. To create a bootable SD Card mix burn

Over the air update

The steps below are optional, however it will streamline development process significantly.

1. Set environment variables SSID and PSK to configure WiFi connection
2. Connect the raspberry pi zero via the gadget connection to the host
3. Run ssh nerves.local
4. Inspect VintageNet.info to confirm that wlan0 is included in the available interfaces list. Under the Interface wlan0 section you will also find the ipaddress being used under Addresses.
5. You can also find the ipaddress by inspectingRingLogger.next. This is also a great debugging tool. You should see something like this being logged:

00:00:20.020 [debug] udhcpc(wlan0): udhcpc: lease of xxx.xxx.x.xxx obtained, lease time 7200

6. Once you've identified the correct ipaddress you should be able to run ssh xxx.xxx.x.xxx
7. After compiling your firmware, you can run upload.sh xxx.xxx.x.xxx to deploy updates over the air

Note: If you are configuring correct SSID and password to a WiFi network, but your device is failing to connect to it it may due to the type of WiFi network. It may be that the WiFi network may be 5GHz and your device is only compatible with 2.4GHz.

Hardware Used

With the listed items below no soldering was required:

• Raspberry Pi Zero WH
• Pi Traffic Light
• Micro SD Card, and adapter to read it on host
• Micro USB cable that supports data transfer

Debugging

Inspect RingLogger.next to see what is being logged.

Todo:

1. Add a HTTP API layer to allow controlling the lights from a web UI
2. Can we avoid constantly checking time every few x seconds? Is there a way to increase performance by adding idle time?