Some crazy stuff happened. My first microphone has a serial i2s (inter sound) interface, but the Nordic datasheet didn't have that peripheral, so in this spin, I use a PDM interface microphone. Well, I downloaded the Nordic datasheet from Nordic Site, and it is v1.4. The I had before was v1.1 and no i2s, and there is an i2s peripheral in v1.4. Awww, crap. It's all good though because I save a pin on the mainboard/daughterboard connector. i2s is 3 lines and PDM can be 2. Oh, well, life goes on.

Here is a photo of the 3D printed motor mounts, a 3D printed stencil frame (or PCB holder) and the e-clips I wanted to use to hold the wheel on, and a motor. The e-clips are 0.8 ID and I couldn't push them on the 1mm shaft, but my next motor can have 0.2mm groves for the e-clips. The bag of e-clips looks spookily like ants.

Also, I order pollywogs through the mail for my son. It is soo weird ordering live things in the mail, but I guess it's ok now. The pollywogs are kind of big. I hope they don't turn into giant frogs that cost a fortune to feed, or worse eat my aquarium fish.