Transcript PIC Theory
Technology Applied Control Systems 1 Applied Control Systems Pin configuration 2 Applied Control Systems Connection of variable resistor / potentiometer Analogue pin connections Input 0 – Pin 17 Input 1 – Pin 18 Input 2 – Pin 1 3 4 Applied Control Systems Analogue to Digital conversion PICAXE 18X: Internal 8 bit analogue to digital converter (28 = 256) Possible Voltage input range:- 0v – 5v Possible conversion :- 0 – 255 Examples: - 0v = 0, 5v = 255, 3v = 153 Conversion formula: Input voltage *255 Conversion = Supply voltage 5 Applied Control Systems Connection of Light Dependant Resistor 6 Applied Control Systems 7 Applied Control Systems 8 Applied Control Systems Voltage Regulator 9 Applied Control Systems Voltage Regulator with Diode 10 Applied Control Systems 0V to pin 5 5V to pin 14 11 Applied Control Systems 12 Applied Control Systems 13 Measure the input voltage. 14 Measure the output voltage from the 7805 15 Applied Control Systems Adding Capacitors 16 Applied Control Systems Reset Switch 17 Applied Control Systems Reset Switch 18 Applied Control Systems Reset Switch – pin 4 19 What happens when the reset is pressed and released? 20 Applied Control Systems Resonator 21 Applied Control Systems Generic components 1. Power supply 2. Download cable 3. Reset connection 4. Available Inputs 5. Available Outputs 22 Applied Control Systems Generic components 1. Power supply 2. Download cable 3. Reset connection 4. Available Inputs 5. Available Outputs 23 Applied Control Systems Using Outputs 24 Applied Control Systems Transistor driver output 25 26 What happens when input 7 is pressed and released? 27 Set output 7 high for 2sec- low for 2sec – loop continually 28 Applied Control Systems PICAXE 18X Project Board (5 inputs, 8 outputs) Inputs Outputs 4 Terminal blocks 6 LED outputs 1 Digital thermometer Two transistor driven terminal blocks 29 Applied Control Systems Use circuit No. 8 to help complete the diagram Outputs Inputs (a) (b) 30 Applied Control Systems Green Yellow w Red Green Yellow Red 31 32 Applied Control Systems 33 Applied Control Systems 34 Applied Control Systems Inputs Outputs 35 Applied Control Systems Inputs Outputs Identify your input and output needs 36