Transcript DC power monitor

Group: CCM
Project 2.5
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 ​
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Goal
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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.
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Remote Access
Why our Solution?
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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
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The system we consist of:
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The Arduino Uno
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Built in ADC
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Voltage Divider Circuit
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Tested with National Instruments ELVIS Board
Arduino Uno
Arduino Uno is ideal for the design due to:
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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 it’s 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.
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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 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77
Samples
Budget
Arduino Uno: $30
 Arduino Logging Shield: $20
 Arduino Uno Enclosure: $12
 SD Card: $15
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Total = $77
Questions ?
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At this point we will entertain questions