Jake Baldwin
Krista Hasling
Maryam Moghaddam-Zadeh
Jack Oakes
Scott Wisdom
Manna Energy Foundation
Manna Energy Foundation
 Founded by NASA Engineers, and the Engineers
Without Borders (Originated from CU)
 Surface water treatment
 Focus on drinking water needs
 Contracted for water purification
 500 secondary schools (High School)
Rwanda
Project Objective
 Provide electrical design and prototype construction
for Manna Energy’s water purification systems
 Features Include
 Control Servos, Relays, Sensors, and Data Logging
 On-site and Remote Access
 Expandable and Flexible
System Overview
System Block Diagram
Supply
PV
Batteries
Power
Pumps,
UVs
Analog
MC
Base
Station
Antenna
GSM
Memory
Division of Labor
Sensors/
Power Relays Primary MCU Memory Cellular
Jack Oakes
X
X
X
Scott Wisdom
X
X
X
Krista Hasling
X
X
X
Maryam
Moghaddamzadeh
X
Jake Baldwin
X
Board
Layout
X
X
X
X
X
Base
station
X
X
X
X
System Block Diagram
Supply
PV
Batteries
Power
Pumps,
UVs
Analog
MC
Base
Station
Antenna
GSM
Memory
• System currently has a commercial product which
performs peak power tracking on the PV array and
outputs 12V DC
• Commercial inverter provides 240V AC at 50Hz
• Need to provide 3.3V, 5V, 10V, and 12V DC via
switching power converters
• Provide 4 regulated DC supply voltages
• Components
• LM3100- buck converters
• LM25005- buck boost converters
• Requires a simple feedback loop to regulate
voltage level
• Special layout consideration will be needed to keep
the high frequency switching away from sensitive
analog components
System Block Diagram
Supply
PV
Batteries
Power
Pumps,
UVs
Analog
MC
Base
Station
Antenna
GSM
Memory
Sensors
5 Vdc
5 Vdc
240 Vac
240 Vac
12 Vdc
Pressure Meter
Flow Meter
UV light 1
UV light 2
Valve
Temperature Sensor
ADC
MC
Sensors and Relays
• Sensor Model Numbers
• Pressure Meter- Omega PX209
• Flow Meter- Signet 2551
• UV light- Sterilight SP100-HO and Sterilight SC1
•
Uses Platinum SPC-ICE-HO Controller (with Relay)
• Valve- DynaQuip EHH2
• Temperature Sensor
System Block Diagram
Supply
PV
Batteries
Power
Pumps,
UVs
Analog
MC
Base
Station
Antenna
GSM
Memory
• Atmel ATxmega64A1, 8-bit AVR
• 78 I/O pins, 16 12-bit ADCs
• 8-channel DMA and Event Handler features uniquely
suited to real-time monitor/control needs
• Facilitates communication between
sub-modules
• Real-time response to system
conditions
Image source:
http://www.atmel.com/products/avr/images/xmega.jpg
• FAT32-formatted SD Card for main data storage
• Removable in case of module failure
• SRAM on processor stores sampled data from ADCs
• Use DMA to off-load work from processor
Sensors
Primary
MCU
I/O
Pins
ADC
On-board
ADCs
Add’l Sensors
SPI
USART/USB
SD Card
Relays and
Control
3.3 Vdc
GSM Module
System Block Diagram
Supply
PV
Batteries
Power
Pumps,
UVs
Analog
MC
Base
Station
Antenna
GSM
Memory
GSM Cellular
 GSM network
 Manna’s preferred access
method
 SparkFun to the rescue
 GSM AVR/PIC
900/1800/1900Mhz
 Pre-Paid SIM card
 Text data exchange
FBD: GSM Module
Serial
Interface
FTDI
SERIAL-USB
USB PORT
SIM300D
AVR/PIC
2 PIN Power
USB Cable
COM-PORT
Emulation
Laptop
Serial
Interface
EXT I/O
I2C or SPI
12Volt DC
External Components
Main
Processor
System Block Diagram
Supply
PV
Batteries
Power
Pumps,
UVs
Analog
MC
Base
Station
Antenna
GSM
Memory
Base Station
• DAQ Factory monitors and manipulates data
graphically
• Status updates sent periodically
• Received data is logged and presented on
graphs
• Various buttons,
channels, etc.
• AT style commands to
communicate with the
ports
•
•
•
•
•
•
•
Data acquisition and logging
Custom screens
Graphing/trending
44 screen components
Sequences and automation
Email alerts
Serial/USB communication
Logistics and Administration
 Timeline/schedule……………......Krista
 SVN, CVS…………………………Scott & Jack
 Budget…………………………….Jack
 Requirements…………………….Jake
-Achieving goals
-Making milestones
 Documents……………………….Maryam & Scott
 Testing…………………………….Everyone
• Ruggedized
• Transportation to site
• Harsh African environment
• Protection against water
•
•
•
•
•
Monitor sensors
Autonomous control algorithm
Log, store, and retrieve data
Generate alerts and status updates
2-way link to a base station via USB or GSM
o Respond to commands from base-station on-site
o Reprogram control algorithm on-site
•
•
•
•
Expandable by non-EEs
Manufacturability
Design system to be modular, support more I/O
Respond to commands and reprogram control
algorithm off-site
• Download data off-site using GSM link
• Directly monitor water quality
• Antenna inside metal box
• Cell network in Rwanda
• Only use on-site interface
• New and unfamiliar architecture
• FAT32
• ATxmega
• Timeline for testing sensor interface
• Temperature tolerance
• Add temperature sensors and/or cooling
Questions?