If you aware that my previous tutorials, you may already know that I have made an Automatic Car Window Roll Up unit for vehicles. In that project I found some lapses that the
- Window always operates when the car lock key is pressed even the door is already locked.
- Window operates based on a timer.
- Even the door is locked inside. The unit start to work.
- No One touch window open/close function.
Therefore, I designed a new unit with premier functions to automatic window system. This unit can identify the window is closed or interrupted to the operation, and one touch window open and close function, only security key can activate the unit etc.If you want you can do more upgrades with this unit but, I have designed this only for 2 windows.Following is given the chart of the project.
The circuit diagram as follows.
The circuit for relays as follows
When you give the power to motor, it must be gone through a current sensor. I have use 30A sensor
The current sensor can detect the current level. Therefore you must do the following.Use a multimeter and check the current need for the operation of the motor.
Then once the window is closed/opened fully, again check the current level of the motor. As an example, when the motor is operating it may be consumed less than 6A and when the window is opened/closed the current level may be about 10A.
Connect pin 5 to the + pin of Car security unit's LED bulbYou can use the following PCBs for this project
Operation of the Unit.If you want to Auto Roll up the window by Security key,
- Engine must be off position
- All the doors should be closed.
Then press the lock key.
You will hear a car horn one time, then the windows will be roll-up.
One-touch open/close window
Auto switch in diagram auto Switch in practice
- When the car is in ON mode, Switch on the "Auto" Switch. Then press up the window key and drop, the window will be closed.
- If you press down the window key the window will be opened automatically.
If you interrupted the operation by pressing again, the window will be stopped.Tuning the Unit.
If you watch carefully, when the car is locked by key, the security led blink at a speed than unlocked. Then count the intervals and you have to change the interval level in the code.
Get the Amperage of the motor when the window is fully opened/closed and put it into the code.
I have assumed that,
- Car horn is from Ground on/off
- Car Door signal is from ground
- Car security LED power 12V
- Window operates when car is ON mode.
- Direct power 12v come though the window switch to Motor