1. Parallel Port Interfacing
Unit 3
Parallel Port Interfacing

2. Interfacing of 8051 with DAC 0808

3. Interfacing

4. Program To Generate Triangular Wave
ORG 0000H MOV A, #00H RISE: MOV P1, A INC A CJNE A, #0FFH, RISE FALL: MOV P1, A DEC A CJNE A, #00H, FALL SJMP RISE END

5. Sine Wave Generation Angle in Degrees (Ɵ) Sin(Ɵ) Count= 2.5+(2.5×sinƟ)
2.5
128 30
0.500
3.75
192 60
0.866
4.66
239 90
0.999
4.99
256
120
0.865
150
0.499
3.74
180
0.001
2.49
210
0.501
1.24 64
240
0.33 17
270
0.002
300
-0.864
0.337
330
0.497
1.255
360
0.0025
2.506

6. Program To Generate Sine wave
ORG 0000H
MOV R0, #30H ;Starting Address
; Store the Calculated Values on address from H
#128
INC R0
#192
#239
#256

7. MOV @R0, #239 INC R0 MOV @R0, #192 MOV @R0, #128 MOV @R0, #64

8. MOV R0, #30H HERE: MOV P1,@R0 INC RO CJNE R0, #3CH, HERE MOV R0,#30H SJMP HERE END

10. Interfacing of Stepper Motor with 8051

11. Stepper Motor Structure

12. Full-Step Stepper Motor
Coil1
Coil2
Coil3
Coil4 1 I
0CH 2
06H 3
03H 4
09H

13. Half-Step Stepper Motor

14. Half-Step Stepper Motor
Coil1
Coil2
Coil3
Coil4
Hex 1 I
08H 2
0CH 3
04H 4
06H 5
02H 6
03H 7
01H 8
09H

15. Interfacing

16. ULN 2003 Driver IC

18. Write a Program to rotate a motor 117o in clockwise direction
Write a Program to rotate a motor 117o in clockwise direction. The motor has step angle of 1.80
1 step = 1.80
Steps= 1170
X= 𝟏𝟏𝟕 𝟏.𝟖 =65
65 steps are to be given to stepper motor.

19. ORG 0000H MOV R0, #30H ;Starting Address ; Store the Calculated Values on address from 30H #0CH INC R0 #06H #03H #09H

20. MOV R0, #30H MOV R1,#65 HERE: MOV INC RO DJNZ R1, NXT SJMP LAST NXT: CJNE R0, #33H, HERE MOV R0,#30H SJMP HERE LAST: END

21. Interfacing of Motion Detectors with 8051
Motion Detector Sensors:
Passive Infrared (PIR)
MircoWave (MW)
Area Reflective Type(IR)
Ultrasonic
Vibration

22. Passive InfraRed Sensor(PIR)

23. Working Principle

26. InfraRed Sensor

28. Ultrasonic Sensor

29. Working Principle

30. Interfacing of PIR sensor with 8051

31. PIR EQU P2.4 LED EQU P2.3 ORG 0000H L1: JNB PIR, L1 SETB LED L2: JB PIR, L2 CLR LED SJMP L1 END

32. Interfacing of LM35 with 8051

33. Interfacing of LCD and LM35 with 8051 via ADC 0808

34. SEL_A EQU P3. 1 _ SEL_B EQU P3. 2 \ SEL_C EQU P3. 3 | ALE EQU P3
SEL_A EQU P3.1 _ SEL_B EQU P3.2 \ SEL_C EQU P3.3 | ALE EQU P3.4 > ADC START EQU P3.5 | EOC EQU P3.6 | OE EQU P3.7 / ADC_DATA EQU P1 _ RS EQU P2.0 | RW EQU P2.1 > LCD EN EQU P2.2 _|

35. ORG 0000H MOV A, #02H ACALL CMD MOV A, #38H MOV A,#0EH

36. MOV ADC_DATA, #0FFH ;DATA PORT TO INPUT SETB EOC ;EOC AS INPUT CLR ALE CLR OE CLR START ;REST OF OUTPUT SIGNALS MAIN: MOV A,#80H ACALL CMD SETB SEL_A CLR SEL_B CLR SEL_C ;SELECT ANALOG CHANNEL 1 SETB ALE ;LATCH CHANNEL SELECT SETB START ;START CONVERSION

37. CLR ALE CLR START HERE: JB EOC, HERE ;WAIT FOR END OF CONVERSION HERE1:JNB EOC, HERE1 SETB OE ;ASSERT READ SIGNAL MOV A, ADC_DATA ; READ DATA ;ADC DATA IS NOW IN ACCUMULATOR CLR OE ;START OVER FOR NEXT CONVERSION

38. MOV B,#256 DIV A,B MOV B,#50 MUL AB MOV B,#10

39. MOV R1,A ANL A,#11110000 SWAP A MOV B,#30H ADD A,B ACALL DISP MOV A,R1 ANL A,#00001111

40. MOV A,#83H ACALL CMD MOV A,#"C" ACALL DISP SJMP MAIN

41. CMD: ACALL INIT MOV P0,A CLR RS CLR RW SETB EN CALL DELAY CLR EN RET
DISP:
ACALL INIT
MOV P0,A
SETB RS
CLR RW
SETB EN
ACALL DELAY
CLR EN
RET

42. ;POLLING FUNCTION INIT: CLR EN CLR RS MOV P1, #0FFH SETB RW L1: SETB EN JB P1.7, L1
DELAY: MOV R3, #10
L1: MOV R4, #250
L2: DJNZ R4, L2
DJNZ R3, L1
RET
END

43. Frequency Counter using 8051

44. Frequency Counter using 8051

45. Data Acquisition System

46. Sensors Sensor Phenomenon Thermocouple, RTD, Thermistor Temperature
Photo Sensor
Light
Microphone
Sound
Strain Gage, Piezoelectric Transducer
Force and Pressure
Potentiometer, LVDT, Optical Encoder
Position and Displacement
Accelerometer
Acceleration
pH Electrode pH

47. Signal Conditioning Amplification Excitation Linearization
Cold-Junction Compensation
Filtering
Isolation
High Impedance
RMS Signal Conditioning

48. Example of DAS

49. Optocoupler