Mixed Signal PSoC based System

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Mixed Signal VlSI Technology To Design Programmable System On Chip To Measure Environmental Parameters Of Polyhouse. By A. S. Powar

Mixed Signal VlSI Technology To Design Programmable System On Chip To Measure Environmental Parameters Of Polyhouse. By A. S. Powar

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  • 1. A . S. Powar, S. K.Tilekar and B.P. Ladgaonkar. VLSI Design and Research Center Post Graduate Department of Electronics Shankarrao Mohite Mahavidyalaya, Akluj Tal - Malshiras , Dist. - Solapur – 413 101
  • 2. • Introduction – Origin of the Problem – PSoC • Designing of the System – Hardware & Software Co-design • Result and Discussion • Conclusion
  • 3. WHY HIGHTECH POLYHOUSE TECHNOLOGY ?
  • 4. Temperature Controlling Unit Humidity Sensor SY-HS-220 Temperature Sensor AD 590 Microcontroller AVR Atmega8L Power Supply +5V +9V -9V Offset Voltage Compensator (741) Liquid Crystal Display (16x2 lines) In System Programming Instrumentation Amplifier AD 620 Instrumentation Amplifier AD 620 Humidity Controlling Unit Phototransistor BPW34 Instrumentation Amplifier AD 620
  • 5. ADC FPGABuffer Amplifier Weak analog signal
  • 6. P rogrammable S ystem o n C hip PSoC Weak analog signals
  • 7. CO2 sensor (MG- 811) & Humidity sensor (SY-HS-220) PSoC 1 Device CY8C29466 - 24PXI LCD
  • 8. o Highly precise and reliable. o Exhibit linearity over 30%Rh to 95 % Rh. o The humidity sensor is of Capacitive type. o Provides DC output voltage. o Good sensitivity and selectivity to CO2 . o Low humidity and temperature dependency. o Long stability and reproducibility.
  • 9. Overall chemical reaction:Li2CO3 + 2Na + = Na2O + 2Li + + CO2 EMF = Ec - (R x T) / (2F) ln (P(CO2)) Where, P(CO2) - CO2 partial Pressure, Ec - Constant Volume, R - Gas Constant volume, T - Absolute Temperature (K), F- Faraday constant
  • 10. CO2 sensor (MG- 811) & Humidity sensor (SY-HS-220) PSoC 1 Device CY8C29466 - 24PXI LCD
  • 11. Inputs :  Each pin can sink 25mA  Programmable filters  Flexible sensor interface I/O  3 types of ADCs, up to 4 Processing : Outputs :  Each pin can source 10mA  Up to 16 PWMs, Timers, Counters  Up to 9-bit DACs, 14-bit ADCs Support Functions :  EEPROM  Sleep Options  Watch Dog Timer  Low voltage detect  Fast M8 Microcontroller Core  Multiply Accumulate
  • 12. ADCINCVR LCD PGA
  • 13. Block Diagram of ADCINCVR
  • 14. Vo =(VIN –VGND).(Ra/Ra+Rb)+VGND
  • 15. I = V/R Q = CV I average = Q/T = Qfs = CVfs R equivalent = V/I average = 1/Cfs
  • 16. Execute boot program: --initialise general purpose resources; --configure application specific modules; --initialise run time environment; --disable interrupt; call main application routine; Void main() { Start system timers; Initialise application specific modules; Initialise global variables; Initialise application specific channels; Enable interrupts; While(1) { Wait for events(Enabled interrupts); Read values from input channels; Execute control procedure & compute actuation data; output actuation data to output channels; } } B) Application programme routine A) Boot programme algorithm
  • 17. Start Initialization of all modules Get ADC reading Get reading for CO2 Display reading Convert in ASCII Calibrate data for Humidity If count<0x65( 200mv) R Display as DetectedDisplay as Undetected NoYes Software Design Flow Of Our System
  • 18. y = 0.0288x + 11.315 0 20 40 60 80 100 120 0 1000 2000 3000 4000 Series1 Linear (Series1) Humidity(%Rh) Output(mV) 30 794 35 860 40 958 45 1092 50 1258 55 1458 60 1709 65 1894 70 2064 75 2224 80 2383 85 2547 90 2729 95 2935
  • 19. Comparision Sr. No. Parameter AVR ATmega 8L System CY8c29466 PSoC system 1 Power 300mW 130mW 2 Cost(₹) X X-400 3 Time 3-4 days 2-3 hours
  • 20. System is designed for measurement of humidity and CO2 gas. The humidity observations shown by the system are highly reliable and precise. Moreover, the presence of CO2 gas is also exhibited by the present system. System works successfully and gives the data of humidity and CO2 very precisely.
  • 21. o Particularly for measurement of carbon dioxide (CO2) gas concentration, the calibration in the respective units is required. However, presently due to unavailability of CO2 gas chamber the calibration of carbon dioxide gas concentration is left as future work. o Implementation of the system for mote.
  • 22. References: 1.Introduction to Mixed-Signal, Embedded Design- Alex N. Doboli and Edward H. Currie. 2. CYPRESS MICROSYSTEMS “PSoC TM The Configurable Mixed Signal array With on-chip controller. 3. An Architecture for a Configurable Mixed-Signal Device Monte Mar, Member, IEEE, Bert Sullam, Member, IEEE, and Eric Blom IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 38, NO. 3, MARCH 2003. 4. P.E. Allen and D.R. Holberg, CMOS Analog Circuit Design – 2nd Ed., Oxford University Press, 2002. 5. R.J. Baker, H.W. Li and D.E. Boyce, CMOS Circuit Design, Layout, and Simulation, IEEE Press, 1998