There where three cats living at Steamhead Maker Space in Shenzhen. This made for a lively show every now and then as each one woudl try to be king of the mat or box. I thought it might be fun to make a small randomized buzzer that would buzz for a second then go back to sleep for 30 to 60 minutes.
I forgot all about it until this morning. It didn't take long to whip up a demo circuit and PCB:
The 20 pin STM32F042F6 MCU PCB includes both a magnetic and pizeo buzzer and will run from a small 750mA Hour LiPo battery. I will solder a TP4056 battery charger to the under side. This will help save space. If I do another version, I will migrate the 0805 resistors and capacitors down to 0603. I think I can shave at least 2mm x 5mm off the PCB dimensions. This will then allow me to add another three PCBs to the production panel
The 2020 Chinese New Year is just three days away, so I hope the order doesn't get lost in the exit stamped.
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