I am trying to design a car shade (the thing you put up in your windshield to block the sun) that is automatic with the press of a button. I have an idea of how it will work and the design, but I am struggling with the circuit.
Here is some background:
The automatic shade will be rolled and unrolled from inside of a casing at the bottom of the windshield with the use of a DC motor.
Don't worry about the logistics of how it will stay up/material/etc, that is not a problem.
Here is the requirements of the circuit:
-When a button/switch is pressed, the motor needs to unroll the shade so that it covers the windshield.
-The circuit needs to stop at a certain point (when the shade is fully unrolled).
-When a separate button is pressed, the motor needs to roll up the shade (turn the opposite direction).
-The circuit needs to stop at a certain point (when the shade is fully rolled up).
-It'll probably just run on batteries.
Here are my ideas:
- Use a small regular DC motor for the turning (with a potentiometer to regulate speed if needed)
- Use a DPDT switch in order to turn on the circuit and be able to change the direction of the motor( the switch settings would be CW, off, CCW)
- Use a 555 timer in monostable mode to control the amount of time the motor will turn (rather than using a sensor to stop the circuit when the shade reaches a certain point)
Here are my issues:
- If the DPDT switch as the trigger of the 555 timer, will i need two separate timers for the two separate directions the switch?
- I don't have a lot of experience using any of these parts, so I'm not sure how I would put the circuit together or if it would even work, a circuit diagram would probably help.