DC power monitor - Texas State University

DC power monitor - Texas State University

Group: CCM Project 2.5 DC POWER MONITOR EMERSON Emerson is a diversified global manufacturing company. Provides innovative solutions to customers in the following areas: Process Management Industrial Automation Network Power Climate Technologies Commercial & Residential Solutions

Goal Emerson 24Vdc Monitor. This device will monitor for 24Vdc. Upon a decrease or increase of 5% of 24Vdc the device will record. Measurements include: Amplitude of the voltage Duration of the change in voltage Time at which the change occurred, and provide a waveform of the collected data. Remote Access Why our Solution? Current Market

Low End Does not cover parameters Lowest Cost of $200 Can only Monitor and either, shutoff, or sound alarm Sample rate is much lower High End Prohibit Expensive for purpose Highest Cost of up $4000 Comes with other tools and options not needed Comes as an package with other tools Bulky Required Equipment The system we consist of: The Arduino Uno

Built in ADC Voltage Divider Circuit Tested with National Instruments ELVIS Board Arduino Uno Arduino Uno is ideal for the design due to: Operating Voltage:5V Input Voltage: 7-12V Digital I/O Pins: 14

PWM Digital I/O Pins: 6 Analog Input Pins: 6 Clock Speed: 16MHz Data Processing The Arduino Uno will continuously take voltage values using its built in ADC A timer is used to schedule interrupts The timer is determined by the desired sample rate When recordings are above or below +-5% of the threshold voltage (24V) the Arduino will store them on the SD card Testing the Voltage Monitor

Using the National Instruments Elvis Board the max sampling rate of the system was found to be 40kHz This system accurately captured a signal of 10kHz at 40kHz sampling rate. Graphs 10kHz signal at 40kHz 0.6 0.5 Volts 0.4 0.3

0.2 0.1 0 1 3 5 7 9 11 13 15

17 19 21 23 25 27 29 31 33 35 37

39 41 Samples 43 45 47 49 51 53 55 57

59 61 63 65 67 69 71 73 75 77 Budget

Arduino Uno: $30 Arduino Logging Shield: $20 Arduino Uno Enclosure: $12 SD Card: $15 Total = $77 Questions ? At this point we will entertain questions

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