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Dio
1.
Digital Input /Output Driver Mina Yousry Copyright
© 2012 Embedded Systems Committee
2.
Agenda: • Topics: • ATMEGA 32 and
DIO pull up and down resistors types of switches switch bouncing Led ,seven segment and Led Matrix Practical work : switching led on and off through sw with delay switching led on and off through switch exp of bouncing and solve it through Sw(first time) and Hw(second time) make any digit on Led matrix make counter using seven segment Copyright © 2012 Embedded Systems Committee
3.
ATMEGA 32
and DIO: ATmega 32 has 32 programmable I/O lines divided into 4 PORTS(groups): 1-PORTA(PA7……..PAO) 2-PORTB(PB7….…..PBO) 3-PORTC(PC7….…..PCO) 4-PORTD(PD7……..PDO) Each PORT is controlled by 3 registers: 1-DDRx (Data Direction Register) 2-PORTx (Output Register) 3-PINx (Input Register Note: Most pins in Mc make more than one function(multiplexed functions) Copyright © 2012 Embedded Systems Committee
4.
ATMEGA 32
and DIO (cont.): ATmega 32 pin out Copyright © 2012 Embedded Systems Committee
5.
ATMEGA 32
and DIO (cont.): Register controlling I/O port: Copyright © 2012 Embedded Systems Committee
6.
How to
set value in register: Example: DDRA=5; //(decimal)mean I activate pin 0 and pin 2 as output and the rest as input pins DDRB=0x14; //(hexadecimal)mean I activate pin 2 and pin 4 as output and the rest as input pins DDRC=0b00000011; //(binary)mean I activate pin 0 and pin1 as output and the rest as input pins Copyright © 2012 Embedded Systems Committee
7.
How to
set a specific pin with conserving other pins: To set specified pin with 1: Make OR operation on the register with The pin no Example: We want to set pin no 5 with 1 PORTA=PORTA|(0b00100000); //(decimal)32 To set specified pin with 0: Make AND operation on the register with (NOT) The pin no Example: We want to set pin no 3 with 0 PORTB=PORTB&( ~(0b00001000) ); //(decimal)8 Copyright © 2012 Embedded Systems Committee
8.
How to
set a specific pin with conserving other pins: To toggle specified pin with 0: Make XOR operation on the register with The pin no Example: We want to set pin no 2 with 0 PORTB=PORTB^(0b00000100) ); //(decimal)4 Copyright © 2012 Embedded Systems Committee
9.
ATMEGA 32
and DIO (cont.): Driving pin: Copyright © 2012 Embedded Systems Committee
10.
Pull up
and pull down resistors: Consider this schematics: • The input state of most logic gates is called a high impedance. • the value of the input is considered to be floating. • Most gates will float towards a high state. This is a very weak condition, and any electrical noise could cause the input to go low. • This convert pin as antenna that can receive electrical noise Copyright © 2012 Embedded Systems Committee
11.
Pull up
and pull down resistors (cont.): Solution: Copyright © 2012 Embedded Systems Committee
12.
Switches: Types of
electronics switches Toggle switch: The toggle switch is usually a two position switch. The internal construction includes a spring such that it is held firmly in the position to which it has been switched. Push button switch: Push button switches are used in many electronic circuits. These electronic switches are often used when a push action is required to give a momentary connection. Rotary switch: As the name implies, rotary switches are operated by turning a knob. Selecting the correct position enables the relevant connections to be made. Copyright © 2012 Embedded Systems Committee
13.
Switches (cont.): ON-OFF Single
Pole, Single Throw = SPST (ON)-OFF Push-to-make = SPST Momentary ON-(OFF) Push-to-break = SPST Momentary Copyright © 2012 Embedded Systems Committee
14.
Switches (cont.): ON-ON Single
Pole, Double Throw = SPDT ON-OFF-ON SPDT Centre Off Dual ON-OFF Double Pole, Single Throw = DPST Copyright © 2012 Embedded Systems Committee
15.
Switches (cont.): Dual
ON-ON Double Pole, Double Throw = DPDT ON-OFF-ON DPDT Centre Off DIP Switch (DIP = Dual In-line Parallel) Multi-way Switch Copyright © 2012 Embedded Systems Committee
16.
Switches (cont.): Switch
parameters and specifications 1-volltage rating: This is the maximum voltage that the switch can withstand . 2-Current carrying rating: The rating of the maximum steady current that a switch can carry through a closed contact. 3-Contact resistance 4-Number of operations: Copyright © 2012 Embedded Systems Committee
17.
Dealing with
Switch Bouncing: The Problem: Switch closed:0v Switch opened:5v >Due to the mechanical nature of any switch that may contains spring return action of some kind. >there wont be a clean transition from a state to another. >there will be a series of high and low states spikes as shown. Copyright © 2012 Embedded Systems Committee
18.
Dealing with
Switch Bouncing (cont.): The Solution: 1-Hardware Based: >Add a capacitor that makes the voltage smooth and clean(without spikes). >the value of R and C determine to react and give adequate output , As T=RC and the capacitor is full charged at 5T: >you can choose R1 = 10 K and C1 = 100 nf >add a schmitt trigger so that it can output 5v (threshold value)when capacitor Is full charged. Copyright © 2012 Embedded Systems Committee
19.
Dealing with
Switch Bouncing (cont.): 2-Software Based: >T1 and T2 are fake logic 0 but T3 is the valid one > Difference between those is their length. >Make a counter count up as long as the signal is Low, and reset this counter when the signal is High. >If the counter reach a fixed value(bigger than T1 or T2) this means that the pulse is a valid pulse (T3). Copyright © 2012 Embedded Systems Committee
20.
LED: >we want
to calculate value of Resistance that put in serial with Led: >supply voltage Vcc=5v >According to datasheet Vd=2v, Id=15mA >so the value of resistance is 200 ohm Copyright © 2012 Embedded Systems Committee
21.
Seven Segment
Display (cont.): >The required current per small segment is 2mA in very small display >The current per segment is 60 mA and increase in the case of of larger Display. >For safe mode we can use a driver such as UDN2981A and UDN2585A IC’s. Copyright © 2012 Embedded Systems Committee
22.
Seven Segment
Display: >UDN2585A can source up to 120 mA while UDN2981A can source up to 500mA. >So that we can illuminate large displays without burning the Microcontroller. Copyright © 2012 Embedded Systems Committee
23.
LED Matrix: >We
have a Problem here that we have to connect column pins to micro and the micro pins must be Logic 0. > so that micro has to sink so much current so that we need a solution. Copyright © 2012 Embedded Systems Committee
24.
LED Matrix
(cont.) The solution Put ULN2003A IC that output 0 when the input is 1,so we can output Logic 1 from micro that make it protected. Copyright © 2012 Embedded Systems Committee
25.
LED Matrix
(cont.) How we can write alphabet A on Led Matrix??? Copyright © 2012 Embedded Systems Committee
26.
LED Matrix
(cont.) Steps Copyright © 2012 Embedded Systems Committee
27.
Copyright © 2012
Embedded Systems Committee
28.
Programming Embedded System
I(book) Esc Presentation Links: http://www.kpsec.freeuk.com/components/switch.htm http://www.electronics-radio.com/articles/electronic_components/switchesrelays/electronics-switches.php http://www.ikalogic.com/de-bouncing-circuits/ http://www.micahcarrick.com/avr-tutorial-switch-debounce.html http://embedded-lab.com/blog/?p=2478 Copyright © 2012 Embedded Systems Committee
29.
info@escommittee.net education@escommittee.com Copyright © 2012
Embedded Systems Committee
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