The voltages and signal timings described below are dependent on the battery voltage and are probably also impacted by temperature. While the calculator runs on a 9 V battery, internally the logic ...

This project implements a 4x4 matrix keypad scanner on an STM32 microcontroller using direct register access (bare-metal, no HAL or LL libraries). The keypad is scanned by configuring the rows as GPIO ...

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Here’s something fun from [Chad Kapper] over on HackMakeMod: Escape Room Lockbox with the Cheap Yellow Display. You may have heard of the “cheap yellow display” (CYD), so-called due to the board’s ...