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This small circuit empowers you to use both, serial and parallel, outputs of your batteries in your projects.
Battery Connection Toggler(Series ↔ Parallel) - Boggler
This post documents the ubiquitous "6 Pin Push Switch" aka "Mini Self Locking Push Switch" and explains how it works.
6 Pin Push Switch Working
There are a lot of sites telling how to use Mongoose OS with pre-made development boards but none focus on the bare ESP32. This post does!
Mongoose OS on ESPer/Bare ESP32
Using an ESP32 development board is easy, but what about a bare ESP32. That's what ESPer is for! It's a DIY development board.
DIY ESP32 Development Board - ESPer
Convert your audio accessories into Bluetooth ones using BluFi. It has mic, button controls, 5V power output and much more!
BluFi - A Portable Bluetooth Audio Adapter