How would you make this work? (see description)?
Wednesday, March 10th, 2010 at
4:07 pm
This is my Technology brief for this year’s project:
Design and make a door for a chicken coop which will automatically open during the day and close at night.
I know to use an LDR for the day/night part, and a motor with PTB switches to open and close the door, but I don’t know how to make the motor re-activate when the LDR resistance changes… any ideas?
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My
name is Fred Paterson, I am currently living in Oregon with my wife and 2
kids.
Are you limited to how many components this project will require? You might consider using a switching transistor(2N2222A) to activate a relay for your switches. Possibly a 555 timer to adjust the motor ON time duration to open or close the door. I say a switching transistor because you can adjust the bias to correlate with the threshold of the LDR between light and dark.