DC POWER MONITOR

Group: CCM

Project 1.2

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? Other Devices are costly can be as great as $4000

These systems can be bulky

The anticipated sample rate is much lower

than most commercial products

Remote Accessible

ProposalThe system we consist of: Protective circuit Comparator A Step down prior to the ADC MAX 1257 ADC Aliasing Filter Raspberry Pi 2

The Protection Circuit

The Protection Circuit will consist of: A fuse Zener diode

Other possibilities A small Breaker

Raspberry PI 2 900MHz quad-core ARM Cortex-A7 CPU 1GB RAM Ethernet port for remote access Micro SD card slot for extra storage SPI interface for fast data transfer between ADC and the PI Low power consumption Easily Remote accessible

MAX1257 Analog to Digital Converter

16 channel 12-bit ADC 25MHz SPI interface 225,000sps( samples per second ) ≈ 1 sample per 4µs Low power consumption 2.5mA at 225ksps -.3V to 6V analog range.

Timeline

Data Processing

The Raspberry Pi will continuously take values from the ADC

When the comparator sends an interrupt, the PI will record the last 100 values into memory along with a timestamp

The comparator will be at logic level 0 when the voltage is <25V

The comparator will be at logic level 1 when the voltage is >25V

Remote Access Windows Remote Access: Using an SSH Client such as

Putty

Static IP Address

By simply typing the IP address

of the PI into the host name

Testing the Power Monitor

The system will be tested using a Pulse Transformer and a Signal Generator to create and control spikes in Voltage

Budget

Raspberry Pi 2 - $35 Maxim ADC 1257 – $25.43 Pulse Transformer - $ 4.79 Bread Board - $4.50 Misc. (resistors, fuses, wire) - $15 Total: $84.72

Question ?????

At this point we will entertain questions