Transcript PIC - t4
Technology Applied Control Systems Applied Control Systems Furby the intelligent toy? – exhibits complex interactive behaviour Inputs Outputs Push switches D.C. Motor L.D.R. Speaker Microphone Infrared LED Tilt switch Infrared detector Process - Microcontroller © t4 Galway Education Centre 2 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 3 Applied Control Systems PICAXE-08 PICAXE-18X PIC 16F628 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. PIC LOGICATOR INPUT PROCESS OUTPUT © t4 Galway Education Centre 4 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 5 Applied Control Systems • 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 ? © t4 Galway Education Centre 6 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 7 Applied Control Systems PICAXE 18X Training Board (5 inputs, 8 outputs) Outputs Inputs 3 Analogue: - 8 LED outputs LDR 1 Piezo Var. Resistor 1 Seven segment Temp. Sensor 2 External motors 4 External outputs 2 Digital: - 1 Stepper motor 2 PTM Switches 1 Server motor © t4 Galway Education Centre 8