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?
