This lecture covers analog and digital I/O with PIC microcontrollers. It discusses analog to digital conversion (ADC) which is used to convert analog voltage inputs to digital values. The PIC16F877A has an 10-bit ADC with 8 channels. Functions for initializing and reading the ADC are presented. The first project involves using a temperature sensor and the ADC to measure and display temperature on an LCD. Pulse width modulation (PWM) for analog outputs is also discussed. The PIC16F877A has 2 PWM channels that can be initialized and have their duty cycle set using functions. The second project controls a fan speed using PWM and a variable resistor. The lecture ends with time for questions.

1. Lecture 5 :
Analog I/O

2. Agenda
• Analog Vs Digital
• ADC Module
• Analog inputs in PIC
• Project 1 “Temperature sensor”
• Break
• PWM Module
• Analog output in PIC
• Project 2 “ Fan speed control”
• Q & A

3. Analog Vs Digital
Analog Signals :- Nature signals which use a continuous range of values to
represent information, Like Sound signals.
Digital Signals :- Signals which uses discrete (discontinuous) values to represent
information , Like computers.

4. ADC Module
Analog to Digital Converter (ADC) :- is a
device that converts a continuous quantity
(Voltage) to a digital number that represent
the quantity’s amplitude.

5. Analog inputs in PIC
PIC16F877A has 10-bit resolution ADC , with 8 channels.
MikroC functions and commands :-
* Void ADC_Init();
* Int ADC_Read(Channel number);

6. Project 1 “Temperature Sensor”
Write a program That measure the temperature is the room and the display that
temperature on LCD.

7. Break

8. PWM Module
Pulse Width Modulation (PWM) :- is a fancy term for describing a type of digital
signal , which is used in many application like controlling Servos and driving RGB
LEDs.

9. Analog output in PIC
PIC16F877A has 2 PWM
MikroC Function and Commands :-
* Void PWMx_Init(Freq);
* Void PWMx_Set_Duty(Duty Cycle)
* Void PWMx_Start();
* Void PWMx_Stop();

10. Project 2 “Fan Speed Control”
Write a program that control the speed of fan , using variable resistor.

11. Q & A

12. For more Informatin
AZEX team
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Mohamed Ali Bedair
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Mail : M.Bedair@Azhar.Edu.Eg