3
PICAXE-08 ALARM PROJECT
revolution
© copyright 2002 - AXE102 Alarm Student Project Notes Version 1.1
Revolution Education Ltd. Email: info@rev-ed.co.uk Web: www.rev-ed.co.uk
3
Supported by:
piezo
output
microcontroller
INPUT PROCESS OUTPUT
digital
LED
analogue
BUILDING YOUR OWN ALARM
Design Brief
Design and make an alarm system. The alarm must be programmed to react to inputs
and sensors.
Design Specification Points
1) The design will use a PICAXE-08 microcontroller as it’s brain.
2) The design will include an LED indicator, a piezo sounder to generate noises and an
alarm output that could be a siren or motor..
3) The design will be also be able to react to analogue sensors such as light sensors.
.
Block Diagram
The block diagram for your alarm may look like this:
Designing Your Alarm
Your alarm may be for any purpose you choose. Some examples are given below.
1) A fire alarm. A light sensor is used to detect smoke. When smoke is detected a siren
sounds.
2) A burglar alarm. When a tripwire is activated a flashing stobe light is activated.
However the alarm is disabled during daylight by a light sensor.
3) A bank safety lock. When a ‘panic’ alarm switch is pushed an electronic solenoid
bolt locks a bank safe door.
4) A baby monitor for a bedroom. When movement or sounds are NOT detected, a
warning buzzer is activated.
To Next Page
Loading...