Install Headers to Bonnet
We'll need another set of male 2x20-pin header pins. These will need to be seated to the bottom of the Speaker Bonnet.
Connect Headers
Using the same 3D printed jig, I soldered all of the header pins to the Speaker Bonnet. You do have the option to use Hammer Headers if you'd like to skip all that soldering.
Install Speaker Bonnet to Pi
Seat the male headers from the Speaker Bonnet to the available GPIO pins on to the PICO hat. Press the boards together so their headers sit flush with each other.
Connect Speaker Bonnet to Pi
Now we can solder the male header pins from the Speaker Bonnet to the pins on the PICO hat. Again, using a Panavise Jr to keep everything sturdy while soldering.
