My take on a pump controller. IMHO a kiss design would keep it cheap and reliable.
- No keypad, and only a single LED display for status
- rtc clock done in software with supercap backup
- 32768 crystal, low cost, power etc...
- Roman Black switching power suppy more efficent than a linear regulator and simple in design.
- iButton **broken link removed** programmable
The DS1994 has a binary real time clock, 10yr battery, 4K bit of NVRAM and lots of code on the net for PICs.
You would sync your iButton to your PCs clock with the simple and cheap reader/writer from
www.ibutton.com you could also enter pump on / off settings into the 4K of RAM
You would then program your pump controllers by simply touching them to the ibutton touch (pictured above) and your done. They're weather proof, cheap and easy to use. A weatherproof keypad would cost you more.
Food for thought.