Getting Started - old version from 2016

This version of the Getting Started guide is from 2016, and focusses on the Cirrus Logic Audio Card, which discontinued production in 2017. A more up-to-date version is available here

Purchase components

These are the components needed to build a Solo using the CLAC (from 2016):

You’ll also need a USB-ethernet adapter to set the clock (only needed rarely, so borrow one if you can) and access to a PC/laptop with a card reader.


See the accompanying video.

  1. gather all the components
  2. place the tiny battery into the clock module (positive side up)
  3. mount the clock module on the Raspberry Pi (product video)
  4. mount the Cirrus Logic Audio Card on the Raspberry Pi and attach the fixing screws
  5. attach the microphone to the pink socket on the Cirrus Logic Audio Card
  6. attach the power cord to the Raspberry Pi (do NOT attach a power supply yet)
  7. protect in the little box
  8. lay the little box into the DriBox waterproof enclosure

Prepare (flash) a memory card

Insert the memory card into the card reader of your PC, and follow the instructions to flash the SOSI (Solo Operating System Image) onto the card. Once flashed, insert the memory card into the Solo’s Raspberry Pi micro SD card socket.

Set the clock

Follow the instructions to set the clock. It should be connected to a network and left to run for 5 minutes. This step can be skipped, but your audio files will be wrongly time-stamped until the clock is properly set.

Do a test recording

To turn it on: attach the power cable to the (charged) USB battery bank, and watch the Solo boot. Notice the green light stabilise (after about 50 seconds) to a “heartbeat” double-flash pattern.

Then allow it to record audio. Sing, shout, hammer. Leave it for at least ten minutes to fill up one complete audio recording file.

Then turn it off: pull the power cord from the battery (at the battery end - don’t disturb the more delicate connector on the Raspberry Pi).

Recover data from memory card

With the power disconnected, remove the memory card, and insert into the memory card reader of your PC/laptop. Follow the instructions for copying data onto your PC/laptop.

Listen and analyse

Play the audio files by double clicking on them. Analyse them with a sound editor - try Audacity.


If it didn’t work - look at troubleshooting.