Zero Effort Coffee Timer

Its glued together

Jon

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1

Solve simple problems with simple solutions

Decide that a coffee timer would be useful. Just an LED that turns on for a minute or two and then turns off. That sounds like something I could use that 555 that's been in my drawer for years for, so simple. One shot 555 timer. Easy.
2

Build 555 timer circuit

Spend an hour getting all the jumpers and breadboards and components out and make sure all 20+ connections are correct.
Perfect.
3

Throw it all away

It only works half the time and triggers when it shouldn't the other half. Swap component values to see if anything improves. Calmly disassemble everything and return components to their respective bins and certainly not dump everything into the 'to be sorted' bin.