Phase 2 LEDC life test complete


The second LEDC battery life test concluded with an error (reset) after 81 hours.

The LEDC actually continued to operate and keep time, but the processor reset when the hourly chime occurred, the chime can draw up to 90mA and the processor browned-out.

With the chime disabled the clock continued to operate, but I concluded the test. LED brightness became a problem because the batttery voltage was approaching the LED forward voltage.

The final test is sleep 10 minutes, and chime on the hour. This is likely to take a long time so I’ll start another project in-between.

Phase 1 LEDC life test complete


The LEDC battery life test concluded with an error (reset) after 735 hours (30+ days), 217 hours greater than predicted. My prediction assumed a higher current load than actual. In addition battery chemistry and the ability for it to recover seems to have also been a factor.

The LEDC actually continued to operate and keep time, but the processor reset when the hourly chime occurred, the chime can draw up to 90mA and the processor browned-out.

With the chime disabled the clock continued to operate, but I concluded the test. Now to the next test, which is continuous operation without sleeping, and chime on the hour. This will not last as long, probably 72 hours or so.