2025 One Hertz Challenge: STM32 Blinks In Under 50 Bytes
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Summary
Rudra Lad has entered the 2025 One Hertz Challenge with a piece of code that creates a blinking LED on an STM32F4 Discovery microcontroller, writes Hackaday.
The code, which compiles to under 50 bytes, is designed to get the LED blinking as close to once per second as possible.
To achieve this, Lad optimised the code by removing all unnecessary elements, such as the standard startup code and RAM.
He also developed a new delay-counting method, which eventually resulted in a blink frequency of 1.00019 Hz.
This is significantly closer to 1 Hz than the 20-30 Hz rates achieved by other entries to the contest so far.
