Friday, December 21, 2012
Wednesday, December 12, 2012
NearSys LLC now sells a GPS Simulator. It allows you to test a near space APRS tracker or flight computer for its behavior during a mission. It's a way to simulate a mission on your bench top, saving you money and difficulty should something go awry.
The GPS Simulator models all the events of a GPS that's making a trip to near space. These events include GPS lock and loss of lock, launch and ascent of the balloon, balloon float, balloon burst, descent, and landing. The GPS lock can be lost at any time during the mission and can be regained at will. The ascent rate, landing speed, float altitude, and burst altitude of the mission are easy to set and vary by adjusting four well-described variables at the top of the GPS Simulator program.
This level of functionality is useful if you programmed your flight computer to respond to conditions like too slow of an ascent rate, unexpected loss of GPS lock, unplanned for neutral bouyancy, passing specific altitudes, balloon burst, approaching landing, or touchdown.
The NearSys GPS Simulator lets you test and debug these programmable features of your near space mission.
You can view the kit and its instructions at the GPS Simulator page at NearSys.com
Monday, December 10, 2012
What can you accelerate using a vacuum? How about a ping pong ball to several hundred miles per hour? The vacuum cannon evaculates the air from a PVC tube. Both ends of the tube are sealed using sheets of aluminized mylar and inside is a ping pong ball. After the air is evacvuated, you puncture the mylar film closest to the ping pong ball. As the air rushes back in, it creates a force on the ping pong ball. Since the air pressure is 101.3 kP and the ping pong ball has a low mass of three grams, the ball's acceleration can exceed 1,000 g's. By the time the ping pong ball reaches the end of the tube, it bursts through the other mylar film cap with a loud bang.
The kinetic energy of the ping pong ball is equal to the energy required to evacuate the PVC, minus losses due to friction and drag. Still, a ping pong ball capable of flying through an aluminum can is mightly impressive.
You can see a video of my vacuum cannon on my YouTube channel
Friday, December 7, 2012
NearSys has updated its BalloonSat Mini flight computer to version 4.0. This version is more convenient to program and to interface sensors. Rather than programming the flight computer through a serial adapter cable, the flight computer now incorporates a DB-9 connector. Interfacing sensors is easier because sensor arrays are available with simple to solder connectors that plug right into the flight computer’s I/O port.
Like the older versions, the BalloonSat Mini v4.0 also operates a camera. The flight computer can operate any electronic camera with a by-passed shutter switch. Cameras modified to work with the BalloonSat Mini v4.0 are available from NearSys.
The BalloonSat Mini v4.0 has memory to record 256 sensor readings. Since it can collect data from two sensors, the BalloonSat Mini v4.0 can record one reading per sensor per minute for the entire ascent of a typical high altitude balloon. However, it will not begin recording data until after the BalloonSat crew removes the Commit Tag.
The BalloonSat Mini v4.0 kit is available from NearSys for $23.50. The kit contains all the necessary parts except for solder. Directions for the kit and sample code are available from the NearSys website at, http://nearsys/catalog/balloonsat/mini.htm.
Wednesday, April 25, 2012
This image was taken in NIR with the camera set to monochrome
This is the ultraviolet image in color.
And the same image, but with the camera set to monochrome
I am rather surprised by the blandness of the ultraviolet image.
Tuesday, April 3, 2012
I am developing a new flight computer, the NearSpace Simple 18. The flight computer is an upgraded BalloonSat flight computer with tracking capability. It has the following capabilities.
- Collect three analog sensor values
- Collect or operate three digital experiments
- Operate two cameras
- Collect GPS data
- Indicate status with a bi-colored LED
- Indicates when the GPS has a lock and when transmitting a position
- Store data in a 32kb EEPROM memory
- Hold collecting data until the Commit pin is pulled
- Transmit APRS position reports
The flight computer is built around the PICAXE-18M2. Therefore, the flight computer is fully programmable (very flexible). If you can write it in BASIC, then the NearSpace Simple 18 can do it.
the tracking portion of the NearSpace Simple 18 is Byonics TinyTrak 3. The Tiny Trak is a well developed APRS trackers and fully programable with settings like callsign and transmit rate.
This is an entry level flight computer that only needs you to connect the GPS and antenna.
Monday, January 23, 2012
Tuesday, January 17, 2012
Here's a list of the commands the rover can act on.
1. Move forwards or backwards
2. Move sideways left or right
3. Move diagonally, forwards or backwards and left or right
4. Pivot in place
5. Turn clockwise or counterclockwise while moving forward or backward
6. Collect photometer data now or over time
7. Pivot a camera left or right within a 90 deg arc
8. Turn on its two laser (indicates the width of robot in video images)
9. Give range data to objects (five angles within 45 deg left and right)
10. Report body tilt
Eventually Plan 8 from Outer Space will be outfitted with an arm to measure the level of radioactivity within a sample.
The robot has an articulated body that twists as it drives over obstacles. The four wheels are driven and are independently steered. Several new NearSys kits are incorporated into the robot, so look for these soon.
1. Smart Sonar (scanning sonar)
2. Accelerometer (used to measure tilt of the robot body)
3. CheapBot-20 robot controller (based on the PICAXE-20) which steers four independent wheels, drives two banks of motors, and has eight I/O ports
4. Bi-directional radio terminal
A side view of my new rover
A front view of my new rover