Curtain Opener Circuit

This Curtain opener will open and close the curtain of your home just by pressing a switch.

With the help of this circuit you did not need to move from your place to open and close the curtain. This curtain opener circuit is used for domestic purpose especially for small doors and windows.

Same circuit is used for closing and opening of curtain automatically. Due to its small size it can be easily fitted with curtain.You can also power the circuit with the help of adapter readily available in market.

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Fig. 1: Prototype Of Curtain Opener Circuit On Bredaboard

Curtain opener circuit comprises of two IC namely CD4013 and ULN2003 with few more components. CD4013 IC contain two independent D type flip flop which exists in one of two states and can store information. Each module is further equipped with a group of pin outs assigned as data, set, reset, clock input and a couple complementary output Q and . CD 4013 comes in 14 pin dual inline package. To understand the working of circuit first we have to understand its pin out of CD4013.

Pin Diagram OF CD4013 Ic

Fig. 2: Pin Diagram OF CD4013 IC

1. Pin no1, 2, 13 and 12 are called as complimentary outputs hence both are available as the output means both output stages (high and low) are available. This set of output changes stage while setting and resetting the IC producing opposite logic level at any instant when operated in bistable mode.

2. Pin 5 and 9 are called as Data pins they are generally connected to one of the output may be Q or for the purpose of lengthening the applied input clock for square wave and for other waves they may be terminated to any other logic level means they may be connected either connected to supply or to the ground of the circuit. In our circuit we have connected and Data pin 5 together.

3. Pin 3 and 11 are called as Clock input this are input pin used to receive clock signals generally in the form of square wave this signals may be provided by the transistor in the form of a stable multi-vibrator or with the help of NAND gate or by NOR gate. And this input will produce effect on any of the output pin the other being connected to Data pin as explained above. In our circuit we are providing clock signal through transistor circuit.

4. Pin 4, 6 and 10, 8 are called as set and reset pin whenever any of the pin goes high we will get the output. When set and reset are low output shows that data at input at the time of last low to high clock transition means output is held till the next transition. For safety these are also assigned to a logic level generally they are grounded with a high value resistor. Once this is done the input can be made to alternately respond to positive peak pulses to toggle the logic stage of the Q and output alternately.

5. Pin 14 and 7 are called supply and ground pin respectively. Pin 14 receives the positive supply input which should not exceed 15V otherwise it will destroy the IC and pin 7 is ground or connected to negative supply input of IC.

ULN2003 IC is high voltage, high current Darlington array, each ULN2003 IC contain seven open collector Darlington pairs with common emitter. ULN2003 is also commonly used in driving wide range of loads with the help of relay drivers or can be used to drive a stepper motor. ULN2003 is for 5V TTL, CMOS logic devices. Each channel or Darlington pair in ULN2003 is rated at 500mA and can withstand peak current of 600mA. Pin diagram of ULN2003 IC is shown below-

Pin Diagram Of ULN2003 IC

Fig. 3: Pin Diagram Of ULN2003 IC

Working of circuit is very simple if you want to open the curtain just press switches S1 momentarily. This will provide the voltage to pin 6 of IC1 and when this pin goes high it will provide you the high output at pin 1 of IC1 which will make the pin 2 of IC2 also high and the geared motor connected to start rotating in close wise direction to open the curtain. Now when curtain is open or you want to stop the motor then press the switch S2 connected at pin 4 of IC1 which is reset pin and used to off or stop the stepper motor .

Similar phenomenon occurs if you want to close the curtain. Just press switch S3 momentarily connected with pin 8 of IC1 which is also a set pin. Geared motor starts running in anti clock wise direction. Now when curtain is close press the switch S4 to off the stepper motor. Therefore you can now open and close your curtain just by pressing the switch.