zakleerite
New Member
hello all,
I intend to have a hobby motor control a small, lightweight door or flap.
This door would be about 8cm/3" square, and would be mechanically "normally closed". When temp reaches a certain setpoint, the door/flap/louvre would open.
I currently use a standard house thermostat to directly control a 12v PC fan.
Now, I want the flap to open when the fan kicks on, and close when the fan is turned off by the thermostat.
I envision a small hobby motor with perhaps a simple limit switch/polarity reverse, or perhaps a simple electronic control circuit.
I have been out of the hobby for so long, I'm afraid I've forgotten much of what I used to know. I'm fairly certain I used to know something, as I still have all these old resistors, capacitors, etc laying around.
Ideally the same voltage that powers the fan would serve as an input signal for the motor control - 12v = motor on in 'forward direction' to open flap. 0v = motor in 'reverse' direction to close flap. I have found some small micro controllers and digital temp sensors, and would consider moving to this, especially if it eases the motor/flap control issue.
Thanks much for any input. Nice forum you all have here!
cheers
I intend to have a hobby motor control a small, lightweight door or flap.
This door would be about 8cm/3" square, and would be mechanically "normally closed". When temp reaches a certain setpoint, the door/flap/louvre would open.
I currently use a standard house thermostat to directly control a 12v PC fan.
Now, I want the flap to open when the fan kicks on, and close when the fan is turned off by the thermostat.
I envision a small hobby motor with perhaps a simple limit switch/polarity reverse, or perhaps a simple electronic control circuit.
I have been out of the hobby for so long, I'm afraid I've forgotten much of what I used to know. I'm fairly certain I used to know something, as I still have all these old resistors, capacitors, etc laying around.
Ideally the same voltage that powers the fan would serve as an input signal for the motor control - 12v = motor on in 'forward direction' to open flap. 0v = motor in 'reverse' direction to close flap. I have found some small micro controllers and digital temp sensors, and would consider moving to this, especially if it eases the motor/flap control issue.
Thanks much for any input. Nice forum you all have here!
cheers