Soil-Water Characterization UnitBenjamin Mussi6.111 Final ProjectProject Background! Mandated sprinkler distribution sampling in Southern states! Current process uses cups to catch water distributed around lawn! Requires manual recording of levels in cups, positions of cups, and calculation of figures of interestProject Description! Portable unit that detects saturation levels of soil ! Depth of sensing: 3.5” Resolution: 0.5”! Unit records the date, time, and position of each measurement! Display gives measurement result and calibration interfaceModular Block DiagramSensor Module! Receives a measurement request! Sequences pad selections to control circuitry and sends read/write signals to ADC converter! Receives ADC measurements! Sends measurement sentence to requestorSensor Module ComponentsSensor Clock Sensor Control Sensor DecoderGPS Module! Receives a position request! Samples synchronized GPS NMEA data stream at 4800 baud! 8-bit ASCII with start/stop bits. ! Structures sentences by counting commas in data stream! Sends the current latitude, longitude, date, and time to the requestorGPS Module ComponentsRS-232 Clock RS-232 Decoder GPS CommunicatorMemory and Video ModulesBRAM Memory Module• Same as in Lab 3 • Sensor: 8x7 - 56 bits• Position: 8x20 - 160 bits• Per Measure - 216 bitsTOTAL: 216x30 - 6480 bitsVideo Module• Verilog code for string display to VGA on course website• Send GPS information and soil measurement information to 640x480 displayDetailed Block DiagramSensor Control<6:0>VideoRS232Out???Buttons<3:0>Sensor(DAC)<8:0>GPSClockTimeline and Extras! December 3 – Baseline unit capable of calibrating sensor, recording sensor measurements, capturing pertinent GPS information, and displaying to a VGA unit! Extra (if time permits): 1) RS-232 export of stored data2) Display to a color LCD3) Graphical user interface4) Visual representation of
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