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

Proposal The 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