Humidity, Temperature vs Pressure

SOhio 2017-1 Stratospheric Sense HAT data (pt 1) Pressure, Humidity, and Temperature

Introduction On the morning of August 12, 2017 I and my co-conspirators flew a High Altitude Balloon mission out of the Wyandot County Airport, near Upper Sandusky, Ohio.  One of the goals of this mission was to show we could operate a Raspberry Pi throughout the flight.  I had hoped to fly an SHT31A Humidity … Continue reading SOhio 2017-1 Stratospheric Sense HAT data (pt 1) Pressure, Humidity, and Temperature

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Planned High Altitude Balloon Flight, August 5, 2017 – Postponed to Aug 12

  Update 8/12/2017:  Flight complete and retrieved. Report to follow. Flight path (enlarge the screen for full path) Update 8/9/2017: I'm planning to launch from Wyandot County Airport (56D), on Aug 12, at 9:45AM EDT. The APRS call sign has been corrected to KB8PVR-3. Present predictions are for a 60 mile flight toward the west, … Continue reading Planned High Altitude Balloon Flight, August 5, 2017 – Postponed to Aug 12

High Altitude Balloon Humidity Measurement Methods

Abstract This is a survey of humidity measurement methods and some of the solid state devices available to perform humidity measurements. I am looking for methods suitable for making stratospheric balloon sounding dew point measurements. I intend to try this using an SHT-31A breakout board from ClosedCube. This sensor should be able to see the … Continue reading High Altitude Balloon Humidity Measurement Methods

Starting Sensors on the Raspberry Pi

One concern about using a Raspberry Pi for high altitude balloon projects, is the ability to reboot the computer and restart data collection.  I've had power interrupted during flight missions, sometimes due to loose wires but often due to batteries dropping in voltage due to the cold.  Things can restart at higher altitudes as payloads … Continue reading Starting Sensors on the Raspberry Pi

Enviro pHAT and High Altitude Balloon Missions

The  Pimoroni  Enviro pHAT is an alternative sensor package to the Sense HAT for use on the Raspberry Pi.  It is smaller, lighter and less expensive than the Sense HAT.  It does not have the joystick inputs or LED display.  Its motion sensor is somewhat less capable.  It adds a color sensor that may not … Continue reading Enviro pHAT and High Altitude Balloon Missions

A Comparison of Sense HAT Specifications to High Altitude Balloon Mission Requirements

Abstract: Sense HAT environmental sensors are useful up to 34kft. Its motion sensors are useful above that. A high altitude balloon mission explores extreme environments. Temperatures can range from surface temperatures of 10C to 30C to stratospheric temperatures of -60C or below, a range of almost 100C or a third of the way to absolute … Continue reading A Comparison of Sense HAT Specifications to High Altitude Balloon Mission Requirements

Some Raspberry Pi High altitude Projects

Here are some posts about using the Raspberry Pi in High altitude balloon projects.  Please feel free to contact me if you have others to add. Note, these projects are primarily from Great Britain.  Congratulations Brits! but are there any US projects? Pi in the Sky: hardware for high-altitude balloonists from Dave Akerman High Altitude … Continue reading Some Raspberry Pi High altitude Projects