Posted Mon Dec 30, 2013, 12:28pm Subject: DIY grinder timer with 0.1 sec resolution
I made simple timer with 555 chip and dip switches. Resolution is 0.1 sec with maximum setting of 16.5 sec (8+4+2+1+0.8+0.4+0.2+0.1sec). Capacitor C4 is very important to ensure that SSR is not triggered at power on. Triggering is by pushing SW1 with portafilter.
Posted Tue Jan 14, 2014, 9:29pm Subject: Re: DIY grinder timer with 0.1 sec resolution
The circuit is connected after original power switch so it's not energised after I finish grinding. There is no override. After initial adjustment I didn't have to change the time. I get around 18 grams in 12.5 sec. Maybe because I'm using one type of blend from the same roaster. It will be better to have access to dip switches without tilting the grinder but I didn't have any nice box/enclosure for them.
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