At89c2051 Projects Link Jun 2026

A 12-hour clock where each hour is represented by the glowing length of an IN-13 tube. The AT89C2051 reads the time from a DS1307 RTC over I2C (bit-banged, of course – no hardware I2C here). The entire firmware fits in under 1.5KB.

while(1) P1 = ~led; // Active low on most dev boards? Adjust as needed. delay(100); at89c2051 projects

Here are some:

Have fun!

Here is a simple math example: $$x+5=10$$. A 12-hour clock where each hour is represented

#include <at89c2051.h>