CHAPTER 3 METHODOLOGY 3.1 Overview The Water Monitoring ...

More documents

Recommendations

Info

Figure 3.7 show that a transistor driven relay circuit is used to connect betweenmicrocontroller and motor pump. Generally this relay will energize when supply voltage,V in is 5 volt (HIGH) and will OFF when V in is 0 volt (LOW).U25VU24240V AC (L)U27NU1U18D1D1N4001NCCOMNOA1 2MOTOR PUMPBP2.1R1Q1Relay_SPDT_b1kQ2N3904Figure 3.7: Pump Circuit with Transistor Driven RelayA relay will operate when a suitable ‘pull-in’ and ‘holding’ dc current is passthrough its energizing coil. An NPN transistor is using to control the coil current. A lowpowercircuitry is providing enough base current to turn the transistor on and off. An NPNtransistor will control the relay with a 5V coil, operating from a +5V supply. Series baseresistor R1 is used to set the base current for Q1, so that the transistor is driven intosaturation (fully turned on) when the relay is to be energized. A very little power willdissipate when the transistor has a minimal voltage drop. A power diode D1 (1N4001) isconnected across the relay coil, to protect the transistor from damage due to the back-EMFpulsed generated in the relay coil’s inductance when Q1 turns off.20
3.2.4 Water Monitoring System CircuitFigure 3.9 shows a water monitoring System Circuits. The GP2D120 sensor isconnected with a conversion circuit to give signal input to ADC, and then from theconversation circuit it will send the data output signal from ADC to microcontroller. Themicrocontroller will send that signal to control motor pump through the transistor drivenrelay circuit. The full circuit connection was design referring to the basic block diagram forthis project at Figure 3.8.Figure 3.8: Block Diagram for Water Monitoring System21
Page 1 and 2: CHAPTER 3METHODOLOGY3.1 OverviewThe
Page 3 and 4: 3.2.2 Analog To Digital Conversion
Page 5: Figure 3.5: Source Code for Convers
Page 9 and 10: 3.3 Programming.Programming is the
Page 11 and 12: ISP flash programmer in Figure 3.11
Page 13 and 14: The Visual Basic program will start
Page 15 and 16: Distance(cm)ReadingVoltage Trial1 (
Page 17 and 18: 4.2 Signal ConversionA sensor has s
Page 19 and 20: 4.3 User InterfaceBased on Table 4.
Page 21 and 22: Hardware DesignBasically, the const
Page 23 and 24: CHAPTER 5CONCLUSION5.1 SummaryWater
Page 25 and 26: This project can be expanded by usi
Page 27 and 28: APPENDICES41
Page 29 and 30: cjne a,volt,xsamejmp startxsame:mov
Page 31 and 32: xsame19:jnc more19mov dptr,#XVALIDc
Page 33 and 34: etrx:jnb ri,$clr rimov a,sbufretdel
Page 35 and 36: ElseShape8.FillColor = vbWhiteEnd I
Page 37 and 38: Private Sub Timer3_Timer()Label3.Ca
Page 39 and 40: APPENDIX EData Sheet AT89S5253
Page 41 and 42: Features• Compatible with MCS-51
Page 43 and 44: AT89S52Block DiagramP0.0 - P0.7P2.0
Page 45 and 46: AT89S52weakly pulled high. Setting
Page 47 and 48: AT89S52Table 3a. AUXR: Auxiliary Re
Page 49 and 50: AT89S52Watchdog Timer(One-time Enab
Page 51 and 52: AT89S52Figure 6. Timer 2 Auto Reloa
Page 53 and 54: AT89S52Baud Rate GeneratorTimer 2 i
Page 55 and 56: AT89S52Oscillator CharacteristicsXT
Page 57 and 58:
AT89S52frequency should be less tha
Page 59 and 60:
Figure 15. Flash Programming and Ve
Page 61 and 62:
AT89S52Table 9. Serial Programming
Page 63 and 64:
AT89S52Absolute Maximum Ratings*Ope
Page 65 and 66:
AT89S52External Program Memory Read
Page 67 and 68:
AT89S52Serial Port Timing: Shift Re
Page 69 and 70:
Packaging Information44A, 44-lead,
Page 71 and 72:
August 1997SemiconductorADC0802, AD
Page 73 and 74:
ADC0802, ADC0803, ADC0804Absolute M
Page 75 and 76:
ADC0802, ADC0803, ADC0804Electrical
Page 77 and 78:
ADC0802, ADC0803, ADC0804Typical Pe
Page 79 and 80:
ADC0802, ADC0803, ADC0804The device
Page 81 and 82:
ADC0802, ADC0803, ADC0804V IN ±5VR
Page 83 and 84:
ADC0802, ADC0803, ADC0804Figures 19
Page 85 and 86:
ADC0802, ADC0803, ADC0804IRQ (4)†
show all

CHAPTER 3 METHODOLOGY 3.1 Overview The Water Monitoring ...

Create successful ePaper yourself

Delete template?

Save as template?