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| Joined: | Jan 15th, 2008 |
| Location: | New Zealand |
| Posts: | 77 |
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I experimented with environmental sensors to drive the selection process in the PIC, but it was very unreliable. I then decided to have the selection process in the PIC firmware so I could have complete control over all the parameters. Over a period of time, this has been refined through trial and error, and is now working very well. I'll include a photo of one of my earlier units. In the unit as shown, the smaller PIC controls the timing of the main PIC. The switches are used for menu selection and parameter adjustment. The Speakjet chip and audio amp are on the breadboard at the rear.
regards,
JEFF
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