Applied Control Systems

Technology

© t4 Galway Education Centre 2

Applied Control Systems

Inputs

Push switches

L.D.R.

Microphone

Tilt switch

Infrared detector

Furby the intelligent toy? – exhibits complex interactive behaviour

Outputs

D.C. Motor

Speaker

Infrared LED

Process - Microcontroller

© t4 Galway Education Centre 3

Applied Control Systems

Microcontroller – PIC (Peripheral Interface Controller)

A PIC is an IC which can be programmed to respond

to one or more inputs and control one or more

outputs, i.e. ‘a computer on a chip’

A PIC contains on board: -

ROM (Read Only Memory)RAM (Random Access Memory)I / O (Input / Output)CPU (Central Processing Unit)

© t4 Galway Education Centre 4

How are PICs used?

• Purchased blank

• Inserted into a circuit board

• A control program is developed and tested on the computer and downloaded to the PIC.

Applied Control SystemsPICAXE-08PICAXE-18XPIC 16F628

INPUT PROCESS OUTPUT

PIC LOGICATOR

© t4 Galway Education Centre 5

Applied Control Systems

PIC Applications: -

• Household appliances - Washing machines / microwaves

• Alarm systems

• Medical equipment

• Vehicle subsystems - engine management / remote locking

• Traffic lights

• Car barriers

• Entertainment industry

• Vending machines

• Display units

© t4 Galway Education Centre 6

• Advantages of PICs :-

• PICs can be repeatedly programmed and reprogrammed

• Increased reliability due to less circuitry requirements

• Rapid product changes can be made by changing the program and not

the electronic hardware

• Greater product flexibility and adaptability

• Provides a platform to support the development of simple to complex solutions i.e. What If ?

Applied Control Systems

© t4 Galway Education Centre 7

Applied Control Systems

Hardware: -

Computer – USB port (Windows NT,ME,2000,XP)

Circuit board – PICAXE 18X Training board

Power supply unit - 9V, 550mA

Download cable - USB AXE027

Software: -

PIC - Logicator Version 2

© t4 Galway Education Centre 8

Applied Control Systems

PICAXE 18X Training Board (5 inputs, 8 outputs)

Inputs

3 Analogue: -

LDR

Var. Resistor

Temp. Sensor

2 Digital: -

2 PTM Switches

Outputs

8 LED outputs

1 Piezo

1 Seven segment

2 External motors

4 External outputs

1 Stepper motor

1 Server motor