1Department of Electrical and Computer EngineeringDepartment of Electrical and Computer Engineering

Senior Design Project Team 21March 7, 2017

Electromagnetic Soil Moisture Sensor (ESMS)

Comprehensive Design Review (CDR)

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Meet the Team

Academic Advisor: Professor Stephen Frasier

Mohamed A. Mohamed EE

Nicholas KeithEE

Erik SpragueEE

Kyle RichardEE

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Overview of the System (Block diagram)

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CDR Deliverables ▪ Power Board Design ▪ Reference sources functioning▪ Data Processing ▪ GPS Location

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Power Board Design ▪ 11.1V source▪ Provides 15V

(LT1171) and 5V (LM2679) supplies for the receiver elements and Arduino.▪ 2 Layer PCB

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Reference Sources ▪ Ambient source: Matched Load

• TMP36 temperature sensor Provides ambient temperature

▪ “Hot” Source: NoiseComm NC302• Measured ENR to be 18.55 dB• Appears 71.6x hotter than ambient

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Data Processing ▪ SD card stores all receiver data for future processing

▪ MATLAB: Linear interpolation to find antenna temperature

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GPS Data▪ GPS data sampled at 10

Hz and data was processed and plotted on MATLAB ▪ Coordinates printed out

every 2 seconds.

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Receiver Circuit▪ Low Noise Amplifier ▪ JCA12-3155

• Gain = 36 dB• Noise Figure = 2.249 dB

▪ Power Amplifier▪ ZFL-2500-1

• Gain = 28.1 dB• Noise Figure = 8.12 dB

𝐹 = 𝐹#   +  𝐹& − 1𝐺#

+𝐹* − 1𝐺# ∗ 𝐺&

LNA, PA, LPF Cascade have a total noise figure of 2.253 dB

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Power Combiner▪ ZC4PD-18-S+ 4 way power

combiner▪ Adds power from each antenna

patch in phase▪ ~0.4 dB insertion loss

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Arduino and Onboard Control▪ GPS added▪ Arduino controls the

switch and all Data being received for later use.

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FPR Deliverables▪ Antenna pattern ▪ User interface ▪ Test cases▪ Demonstrable product▪ Soil moisture map

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Demo

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Questions, Comments, Suggestions?