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The pattern lock of Android device fascinates me. From the inspiration of Android pattern lock I made a physical pattern lock using IR sensors and Arduino microcontroller. You can use the lock where some sort of security is required such as your home or office.

No more tension about losing the keys!!!

The lock has following features:

  • Contains 9 sensors and lots of patterns are possible
  • Pattern change button to change the pattern anytime.
  • LED Indication for wrong and right pattern
  • Blocking facility for multiple wrong try
  • Power saving mode

Demo Video

Step 1: Bill of Materials

Components

1. Photointerrupter (LTH-1550-01) (Seeedstudio.com)

2. ATmega328 with Arduino Optiboot (Sparkfun.com)

3. Mini Pushbutton Switch (Sparkfun.com)

4. Resistor 220 ohm (12 pcs)

5. Resistor 15k (10 pcs)

6. Resistor 1k (1 pcs)

7. Perfboard (3.5" x 2")

8. Acrylic Sheet (2" x 2")

9. Arduino (for programming the microcontroller)

10. General purpose transistor (2N2222 or equivalent- 1 pcs)

11. Lithium Ion Battery - 850mAh (Sparkfun.com)

12. LiPo Charger/Booster (Sparkfun.com)

13. Some jumper wires

Tools

1. Soldering Iron (Sparkfun.com)

2. Hot Glue Gun (Seeedstudio.com)

3. Diagonal Pliers (Seeedstudio.com)

<p>hello i in Indonesia, for goods Photointerrupter (LTH-1550 to 1501) there has been no selling, whether it can be replaced with this stuff TCRT5000L TCRT5000 INFRARED REFLECTIVE OPTICAL SENSOR photoelectric.?</p>
Yes, it is possible. Though outlook is different booth have approximately same electrical characteristics. You may change the value of the pull-up resistors for using the sensors you mentioned. It will be good to test one with 10-15k resistor before using. Thank you.
Yes, it is possible. Though outlook is different booth have approximately same electrical characteristics. You may change the value of the pull-up resistors for using the sensors you mentioned. It will be good to test one with 10-15k resistor before using. Thank you.
Very good work here, I have question , do you need extra atmega328 chip ? I already have uno.
<p>You don't need to use complete UNO board. After uploading the program just use the ATMEGA328 IC in your circuit board.</p>
Well designed project!My congratulations!
Thank you.
<p>Excellent work dude</p>
Thank you bro.
<p>amazed !!!</p>
<p>Thanks</p>
<p>Just cool!!! I am going to make one. Expecting your help.</p>
Thank you, ready to help you.
<p>cool,</p><p> would have used an electric lock.</p><p>good project.</p>
Thank you.
Amazing thought bro.<br>I'll definitely try this.
Thank you bro<br>
<p>Good project...I will try this with my drawer... you have my vote.</p>
Thank you very much.
good work? how to change the pattern?
<p>Thank you. To change the pattern first draw the right pattern. Then press the update button and enter the new patter. </p>
Thank you ?
<p>Nice project.</p>
<p>Thanks.</p>
Great Job!!! Voted for that!!! Definitely gonna try this!!!
<p>Thank you very much.</p>
very cool!!!
<p>Thank you.</p>

About This Instructable

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Bio: I like to learn, like to make, like to share.
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