POPEYE is a HAB Payload designed to downlink Live Pictures using SSDV.
A prototype of this payload was demoed in the Introduction to High Altitude Ballooning talk I gave at the BATC Convention 2013. It was also intended to be launched at the Convention but the Launch was cancelled due to adverse weather.
GitHub Code Repository: https://github.com/philcrump/pi-tv
SUSF Flight from Cambridge - 5th April 2014
This payload flew on one of the two Southampton University Spaceflight Society Outreach Flights on the 5th April. It reached 38.5km in altitude. Despite a difficult launch in high wind, the payload performed well apart from a minor bug in the temperature overlay that didn't correctly parse negative temperatures.
- 434.200 MHz 600 Baud RTTY Downlink
- 400x256 JPEG Images with FEC
- Sensor Data Overlay
- Locally stores 1920x1080 PNG images
- Estimated 4 hours battery life on single 9V PPA.
- Diode-OR power available to power from external source during prep before launch.
- Raspberry Pi Model A
- Pi Camera (non-IR)
- 2x DS18B20 Temperature Sensors - Datasheet
- Radiometrix NTX2B 434MHz Transmitter - Datasheet
- 3.3V 600mA Buck Regulator - Info
- Energizer Ultimate Lithium 9V Battery, 750mAh - Datasheet
- 2x Schottky Diode-OR to allow use of external power source
An 8GB SD Card will be used for the flight.
- 80-120KB / pic
- 8-12KB / rxed pic
- Snapped every 6 seconds
- 3.1MB / pic
- 1860MB / hour
- 7.4GB / 4-hour prep+flight
Measured at 8V (nominal battery voltage) into the Step-Down Regulator.
Using a Raspberry Pi model A
- 60mA with NTX2B running
- 160mA with Camera + NTX2B running (50% Duty Cycle)
Average draw: 110mA which means ~7 hours off 1x 9V PPA cell!
Using a Raspberry Pi model B with ethernet active (ssh control session)
- 190mA with NTX2B running.
- 290mA with Camera + NTX2B running (50% Duty Cycle)
Using a Raspberry Pi model B with ethernet unplugged
- 150mA with NTX2B running.
- 250mA with Camera + NTX2B running (50% Duty Cycle)