dt3: solar-powered “connect-on-demand” satellite/radio link for tanzanian schools luis garcia...
Post on 19-Dec-2015
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DT3: Solar-Powered “Connect-on-Demand” Satellite/Radio link for Tanzanian Schools
Luis GarciaEric HatchJoe LarsenMichael MoultonRafael OcampoRodney Singleton
Background Joint project with Electrical
Engineering and Telecommunications
Supply internet access to rural schools in Tanzania
Past projects focused on time sharing computer systems
Currently implementations• Baraka Primary School• Manyara Secondary School
VSAT to the internet is at Baraka Baraka is reliant on solar power Team 4 will be installing a third
installation at Rift Valley Secondary School
Rift ValleyBaraka
Manyara
5 - 6 miles
2 Miles
Overview of Design
WiMAX
AM radio
AM transmitter AM
reciever
decoder
modem
router
microcontroller
Battery charge controller
Software Design software that will determine if a request for
the internet has been made by the user. Save packets during request before internet boot-
up, and send once a connection has been established.
Generate signal to be sent to transmitter for turning on network equipment.
AM Radio
Send Signal from Manyara or Rift Valley to Baraka
Transmitters at Manyara and Rift Valley Receiver at Baraka
• Low Power Consumption Operating on 462MHz
• Availability• Antenna design
Microcontroller Function
Will be used to turn off/on the sub-system using relays. Will take in 4 inputs:
Battery life• Less than 40%
Reset Timer• 15 minute timeout
Internet Request• Requests from either Manyara, Rift Valley or
Baraka Internal Clock
• 11pm curfew
Design Criteria
Order of Priorities:1. Low Power
Consumption2. Robustness/Durability3. Low Maintenance4. Safety5. Low Cost
Risk Management
Multiple external timers, risk of power consumption.
Remote diagnosing? Safety of equipment. Collaboration for multi-seat deployments.
Cost
Hardware: Programmable Timers: $5 – $10 Micro Controller: $0 Am transmitter and receiver: $12 – $80 3 Op Amp: $6 – $10 WiMax: $1,900 Wires: $15 – $30 Power Strip: $6 – $20 Project Enclosures: $10 – $80
Software: Python - $0 Libpcap - $0 All Software is open source