I first started with a PIC16F84A, the type of microcontroller I used most often at that moment. This was a very time-consuming job as the filling of a pot lasted a few minutes and the proces had to be repeated a couple of times. repaeat the procedure until you are satisfied.if the coffee-level is not OK: turn the potmeter a bit.The calibration procedure of the NE555 timer was as follows: The main reason to replace the NE555 timers were incovenient calibration and because of electrolytics in the circuit the long-time stability was not so good. Now, a couple of years later, I think the idea may be usefull for other hobbyists. ![]() ![]() But the timer never came into production. Original designed for a coffee-machine containing 3 NE555 timers for 3 different keys: cup, half pot, full pot. Not exactly a drop-in replacement for the good old NE555, but usefull for many timing jobs where a delay of seconds until hours is needed. Simple digital timer as NE555 killer in many application were accurate timing is required from seconds until hours.
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