for a home project, I am looking for ZigBee modules that already  
inter-operate and have node modules that have digital I/O and analog  
I/O.
I looked at ArchRock.com. they seem set up for large OEM buyers.
Digi.com looked like a possibility. Their digital I/O modules seemed  
expensive.  The $21 module looked like the right price.  I could not  
figure out whether the module had I/O capability the could be  
controlled through the network mesh.  There was some mention of  
adding your own code??

My first unit to be controlled is a analog clock from Walmart for  
$3.99.  I removed the crystal controlled stepper motor and added a  
cell phone vibrator motor so I could run the clock hands forward or  
reverse at any speed I wanted.  The scheme works but all the control  
i have added so far is human hand operated ( reverse the motor  
wires ) direction control and human hand operated ( touch the battery  
with the wire ) PWM control.

I want a clock that I can control wirelessly.

cc
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