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Topic: Need a Auduino Board Configured and Programmed (Read 1 time) previous topic - next topic

CrossRoads

"He states he would like an offer from johnwasser and crossroads"

Maybe you're are going a little overboard:
http://www.dailymail.co.uk/sciencetech/article-1318814/Luke-Geissbuhler-son-send-weather-balloon-100-000ft-space-capture-amazing-video-footage.html
Only need -60C = -76F

John,
Do you want to collaborate on something?
I could do hardware design & building in the evenings (summer is a good time for me for that) if you need something built up, like a wirewrapped promini kind of board, with connectors for the sensors, programmed via FTDI Basic.
Or build up a modified serial arduino (I have 6 bare boards and all the parts, skip the header connectors and solder to the shield holes).
Or PCB version of same if they want to make multiple copies for other experiments or experimenters.
Robert

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

johnwasser

I'm a 'mostly software' guy with electronics merely as a hobby.  I'd need to see a much better specification before making any kind of proposal/offer/contract bid. 

For example:
      What is "small and light" in this context?
      Where can one get a temperature sensor rated for -100°C (and the support electronics to make it readable) that is "small and light"?
      Is there a  upper limit to the temperature range that is to be measured?
      Do they want any kind of realtime timestamp in the data log? 

If it weren't for the extreme low temperature temperature sensor it would be easy to slap an adafruit data logging shield on an Arduino UNO and add the pressure and temperature sensors.  That would be about 50 grams.  If I could run it off three AA batteries for the required 5 hours flight time that would add another 75 grams or so.  It's the super low temperature thermometer that doesn't seem to be available.  EVERYTHING that is of reasonably size and weight is limited to -55 or, rarely, -60.
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CrossRoads

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

itsupport


Great!

If the temp sensor becomes too much of a burden we can go with a pressure sensor only.

Light weight is the key here. We are strapping this data logger a small weather baloon (5 to 10 foot diameter).

Whatever process would be easier for you guys is ideal,

Seems like adding different peripherals to a preexisting arduino board might be faster and cheaper.

Is that correct?

Thank you guys for your time,

-Mark

johnwasser

I had been looking at Sensors and Transdcers: Temperature, not in Test Probes.

So a thermocouple should be able to measure the desired temperature range but I have not worked with them before so there will be a bit of a learning curve.  The various compensated thermocouple amplifier chips seem to have a low temperature limit in the -40°C range so I can't go the easy way.  I guess what I'd have to do is hook the thermocouple to an op-amp to bring the -4 mV reading (120°C below ambient) up to about 4V.  Since the measurements are relative to the "cold junction" ambient I probably don't need to worry about voltages above 0 so I can just use the op-amp as an inverting amplifier with a gain of 1000.  That will give a resolution of about 3.9 microvolts which is better than 1/10°C resolution at the 'hot' end (0°C) and better than 1/4°C resolution at the 'cold' end (-100°C).
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