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Balloon Telemetry Kit by Public Laboratory

posted Sep 26, 2011, 8:19 AM by Cesar Harada
http://publiclaboratory.org/tool/balloon-telemetry-kit

A sister organization run by friends of Open_Sailing is doing this kit. Might be useful for us at some point :) ?

This kit was created as a means to improve the georeferencing of images captured using balloon mapping. This kit is based around the open-source Arduino mircocontroller. Utilizing a GPS receiver, barometric sensor, three-axis accelerometer and data logger, this module allows for the synchronization of data with images captured from a Canon camera running the CHDK. By utilizing the USB remote function of the CHDK software the camera can be triggered in sync with the logging of the sensor data.

Along with the georeferencing capabilities, this kit captures the position of the camera in relation to the ground plane. This is done by capturing the x/y rotation of the camera with the accelerometer.

Parts List:
ADXL335 Accelerometer
Barometric Pressure Sensor - SCP1000 
OpenLog data logger
Arduino Proto Shield
GPS Module
Arduino Board

Sample log data:
lat,long,Date(yyyy-mm-dd),Time(hh:mm:ss:cc),alt(m),course,speed(knots),speed(mph),speed(mps),speed(kmph),pressure(Pa),baroAlt(m),xAxis(deg),yAxis(deg)
40.76892,-73.94951,2011-1-21,21:43:15:0,39.50,227.29,0.00,0.00,0.00,0.00,100297.75,85.86,-57,-80

Arduino code available here

Here is a quick test of image rectification using the accelerometer data.

This picture shows some data (GPS elevation, barometric altimeter) being transmitted live from the module over the Passaic River to the laptop, November 13, 2010:
a high point

We are considering using this method to write this information into the EXIF for each image.

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