DN Staff

October 26, 2016

1 Min Read
Gadget Freak Case #157: Microcontroller Lock Hardware Protects Bill's Sock Drawer

William Grill doesn't like people messing up his sock drawer, so he added an electronic lock that requires a user-defined sequence of key codes from three pushbuttons. The correct sequence opens the lock and turns on a status light. Enter the wrong sequence and an alarm circuit socks it to you with a noisy buzzer, flashing LED, or both. The designs use a Microchip Technology PIC12F509 microcontroller. Who knows what's in store for William's tie rack?

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Gadget Freak Case 157 Microcontroller Lock Hardware Protects Bill's Sock Drawer

Gadget Freak Case 157 Microcontroller Lock Hardware Protects Bill's Sock Drawer A


  

 

Amt

Part Description

Allied Part #

1

IC1-Microchip PIC12F509 MCU (8-pin DIP)

1

Solenoid

1

10I.25F Capacitor (50V DC)

1

2.2I.25F Capacitor (50V DC)

1

L3-LED, Green

2

L1, L2-LED Red

1

ASLM1-Mallory Sonalert

2

Q1, Q2-IRLD024 Power MOSFET, N Channel

1

820I(C) Resistor (1/8W)

2

10KI(C) Resistor (1/8W)

1

100I(C) Resistor (1/8W)

1

330I(C) Resistor (1/8W)

1

L78L05ACZ Voltage Regulator

2

D1, D2-1N4148 Diode

2*

D3, D4-11DQ05 Schottky Diode

3

K1,K2,K3-Pushbutton Switch

1

AZ943-1AH-5DE Relay, %V DC Coil

1

8-Pin DIP Socket

2

3-Contact Terminal Block

1

Battery Holder (3 AAA)

3

Battery, AAA. Alkaline

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