The Noer (As in "the thing that says No" or the "No! er") was an interesting aborted project. I wanted to build a simple TOF sensor setup that would play a small audio sample when triggered. The idea was to keep the dog out of things ("No Clementine!"). I breadboarded this quickly enough using SparkFun's Audio-Sound breakout and an ST Micro VL6180X proximity sensor. For the next revision I wanted to build an extremely low-power device allowing it to operate for weeks on a single LiPo battery. I also wanted a proximity sensor with a range of 1-meter or more. I found a great sensor in the ST Micro VL53L0X but I had a lot of trouble finding the right audio chip solution. I found some random Chinese part (which I call out because of the almost unintelligible English translation of the datasheet) on Digikey that claimed it could be programmed over SPI. I liked the idea of using a Teensy 3.6 to program the Noer once allowing the device to operate without an SD-card. Despite some successful interactions with the audio IC I ultimately had to give up. The datasheet was just too sparse to program it myself and the Windows XP program they provided to do mass programming was only available if you bought a few thousand of the chips. I may revisit this project again if I come across the right audio IC.