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5 pages across tutorials, modules, pinouts and guides.
INA219 and INA3221 Current Monitors: shunt, range and wiring
Two I²C current and voltage monitors: the TK119 with one INA219 on a 100 mΩ shunt, and the INA3221 with three channels on 50 mΩ. What the chip measures and what it works out, why the two resistors differ, the range and step each one gives, and the wiring for both.
USB-C PD Trigger, 100 W Decoy 5–20 V
A USB-C charger holds 9, 12, 15 and 20 V and hands you 5 V until something asks. This board asks. Three levers set the voltage, a CH224K does the negotiating, and a screw terminal brings it out.
USB-C Breakout Board with 5.1 kΩ CC Resistors
A USB-C socket that a modern charger will actually talk to, with both CC pull-downs already fitted. What the resistors do, which of the six pads is which, how much current you may take, and the one thing the board can never be.
ESP32 LiPo Dev Kit: 3 Boards with a LiPo Charger, and 3 Shields
Three classic ESP32 boards that charge a lithium cell from USB-C and run from it when the cable comes out, and three shields to wire them on. Which cell, which socket, which way round, and how long a cell lasts.
AMS1117 LDO Regulator Modules: 3.3 V and Adjustable
Eighteen fixed 3.3 V boards and six adjustable ones that turn a higher supply into a steady lower voltage. What to feed them, which pin is which, how much current before heat stops them, and how to set the adjustable board.