fabulous weather-sensing data-logger !
DESCRIPTION
Fabulous Weather-Sensing Data-logger !. Introducing the…. 100% designed and manufactured at the Vigyan Ashram FabLab!. Topics. What it is and how to use it (Demos) Why we made it How it works (sort of) How we made it How you can make more!. - PowerPoint PPT PresentationTRANSCRIPT
FabulousWeather-Weather-SensingSensing
Data-logger!
Introducing the…
100% designed and manufactured at the Vigyan Ashram FabLab!
Topics
• What it is and how to use it (Demos)• Why we made it• How it works (sort of)• How we made it• How you can make more!
What is a What is a Weather-SensingWeather-Sensing
Data-logger,and how is it and how is it
used? used?
Why do we need Why do we need a a Fabulous
Weather-SensingWeather-SensingData-logger? ?
How does it work?How does it work?(What’s going on down there?)(What’s going on down there?)
The CircuitThe Circuit
CPU = BrainCPU = Brain
=
Clock = Heartbeat
=
Buttons = Ear
=
LCD = Mouth
=
Memory = Memory
=
16 kB ????? kB
Sensor = ear/eye/skin/nose/etc
=
Information0V, 5V,1001001
0V
5V A, B, C, D
Aa k p ma
0110110101001110
01101101011110
1 1 0 0 1 0 1 0 1 0
fablab
Aamabaa
=
Code = InstructionsHow to wash your plate:• Rinse plate with water .• Empty water into bucket.• Wait in line for sink.• At sink, apply soap to plate. • Scrub plate.• Rinse with water.• Submit for inspection
Communication
=
It All Comes Down To:
Hardware(Stuff you can touch)
Software(Stuff you can’t touch)
Firmware(Something in between)
So there you have it! So there you have it!
The designThe designprocessprocess
(i.e. why did we have to (i.e. why did we have to spend ALL that time in the spend ALL that time in the
FabLab?)FabLab?)
What and Why?
Problem Definition:What are we trying
to do and why?Questions
Questions
Questions
Questions
Questions
Questions
Questions
Questions
Questions
Questions
QuestionsQuestions
How?
Hardware, Software and Firmware Specification:
How are we going to do it? Breaking
The problem Into Parts
That We Can
D e a l W i t h
Using What?
Setting Up theDesign Environment:
Finding and learning thetools we need.
With What?Parts Procurement:Getting the bits and
pieces we need
Design Build Test Evaluate
Implementing the solution
Answers
Answers
Answers
Answers
Answers
Answers
Answers
Answers
Answers
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Answers
An Indication of Complexity
• Software: 2000 lines of code!
• Firmware: 1500 lines of code!
• Hardware: Three prototypes
Many many hours of design, testing and debugging.
High level state diagram v5Initialization
Upload data
Sensor test
“Show sensor readings” request Receive setup
data
Take readingsand log data
Display status
Status request
UART: on any
character
Timer interrupt
every 0.01 sec
INTERRUPTS (ISRs)
Task done
Task done
Setup request
Upload request
Task done
Task done
Task done
•ISRs process button pushes, Uart , timers.(Specific states may have some interrupts disabled).•ISRs set flags that are examined within states at appropriate times.•No state transitions occur before tasks complete. •State transitions are determined only in one of the two idle states.
Idle
Task done
Status request
Test request
Log interval timeout
Eventually we may want to allow data logging to cause an exit from Display Status and Sensor Test Modes
Task done
Task done
Main loop
Do setup-on uartrx “S”
SensorTest – on “ST”
key press
Display status – on “DS”
key press
LogData – on
logging Interval
”
UploadData –
On uart rx ‘U”
STATEREQUESTS
Start/StopLogging
Clear memory – On uart rx
“C
Start/Stop logging – on button press
Vigyan Ashram Weather LoggerSoftware application state diagram
Help pages
Main Menu
Setup
EstablishConnection
To Datalogger
Quit
UploadClear Memory
[S]etup , [U]pload[C]lear Memory
[Q]uit
Failed to connect and user does not want to retry, or,Device is still logging and user does not want to stop logging.
Success
Success
Success
[H]elp
[B]ack
[B]ack
Completed task
Completed task or [B]ack
[S]etup , [U]pload[C]lear Memory
Ask user:Retry / Back?
[R]etry
Loggerresponse?
[B]ack
Invalid or no response
Ask user:Stop logging or
Go Back?
Ask chip to stop logging
Establish Connection:
Receive ‘L’(loggingenabled)
Receive ‘A’ck
Loggerresponse?
Timeout
Error msg
Main Menu
Send‘S’, ‘U’ or ‘C’
[S]top logging
Send ‘D’
Receive ‘D’
Success msg
End comm with logger
Send ‘Q’ tologger
Setup orUpload or
Clear memorymodes
Success msg
Flowchart for“Establish
Connection”state
User presses any key
User presses any key
Notes:-Every time we ask the user for input, we provide a message if the input is not valid.
[B]ack
How to make How to make your own your own Fabulous
Weather-SensingWeather-SensingData-logger? ?
Mill!Mill!
Drill! Drill!
Solder! Solder!
Enclose!
Results
Results
Future Additions
• Other sensors– Rain gauge– Solar radiation sensor– Wind speed/direction sensor
• USB
• Wireless
Please Keep In Touch
Michelle:
Scottie: