Installing the BrewPi software
I am writing a new step-by-step install guide on the community forum:
Your BrewPi Spark shipped the firmware in test mode. We use this mode to confirm that the controller works correctly before it ships. Test mode auto-detects connected temperature sensors and lets you toggle the digital outputs on the controller. Use it to your advantage when you are building BrewPi into your fridge.
You can power the BrewPi Spark with a 12V adapter or with a micro USB power supply. After you have connected your SSRs and sensors, toggle the outputs to confirm that you have wired everything correctly. Also write down the OneWire addresses of the sensors with their location.
Please refer to your fridge hacking guide on how to wire the SSRs inside your fridge. Four green connectors for the outputs have been included. With these connectors you do not need to strip your wires. Just insert them and push in the orange part. The sticker on the back of the controller shows which pin is plus and which is minus.
For configuring your sensors and heater/cooler, please copy the device list example here: http://docs.brewpi.com/after-install/device-configuration.html
This configuration is done via the web interface that runs on your Raspberry Pi. Setting this up is described in the software install guide above.