Data acquisition systems, abbreviated by the initialisms DAS or DAQ, typically convert analog waveforms into digital values for processing. The components of data acquisition systems include Sensors, to convert physical parameters to electrical signals. It demonstrates the data acquisition system for Water and Air Quality Measurement in Real-Time Project

1. The Architecture of VENUS Data
Acquisition System for WAQM
Project
By - Surya Raj

2. Functional Block Diagram
Sensors
Signal
Conditioning
` Data
Processing
Power
Supply
DAQ Device
Electrical
Signal to
Voltage
Filter
NetworkingData
Monitoring
Input
MUX
PGA
Digital
Filter
SPIADC
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3. Schematic
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4. Sensor Output to Voltage
Input Specs
1. 4 to 20 mA dc (6 Ch)
2. 0 to 10 V dc (6 Ch)
I2V: 4-20 mA (in) -> 0.4-2V (out) V2V: 0-10 V (in) -> 0-2.09 V (out)
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5. Schematic
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6. Input Filters
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Differential-mode signal –3 dB cutoff frequency ,
fDIF = 1 / [2π · (RF1 + RF2) · (CDIF1 + CCM1|| CCM2)] ≈ 3.4K Hz
Common-mode signal –3 dB cutoff frequency ,
fCM = 1 / (2π · RF1 · CCM1) = 1 / (2π · RF2 · CCM2) ≈ 34M Hz

7. Schematic
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8. Power Supply
Input
(FPGA)
Output (ADC)
Specifications:
Available Input: 3.3 V, up to1A (FPGA)
Required Output: 5 V & 3.3 V (ADC)
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9. System Component Placement
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->PCB ->Analog Plane ->Digital Plane ->Power Supply ->AGND=DGND

10. Thank You!!
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