Hi all,

I've got to say, I'm having a lot of fun on this little dimmer project
of mine. Trying to cram as many options and possibilities into a tiny
space is intriguing!

My latest idea involves the control. I had originally planned on using
a pot to control the dimmer. But with a bit of searching I've found a
pot and an encoder with similar enough footprints that with a bit of
tweaking I'd be able to fit either on the board. For those curious,
the pot is the P0915N-FC15BR10K and the encoder is the EN11-HSM1BF20 ,
both from TT Electronics.

My original plan was to use a bunch of resistors as jumpers and load
the board depending on which controller was installed. Then I got to
thinking...(uh oh...).

Each device has three pins. On the pot, 1 and 3 are the sides of the
resistor, and 2 is the wiper. On the encoder, pins 1 and two are the
outputs, and 2 is the common. What I'm thinking about doing is
connecting all three to the PIC, with pin 2 being an analog input
capable pin. For pot use, I'd set pin 1 and 3 as outputs, and set 1
high, and pin 2 as an analog input. For encoder use, I'd set pin 2 as
an output and set it low. Then set pins 1 and 3 as inputs with weak
pull ups and read away.

Thoughts? Pitfalls? Trying for the lowest parts design to save space!

Josh




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