|Back in 2007 I had been working on an
altimeter that would record maximum altitude
in feet, then deploy the chute after apogee. It had a beeper to tell
I started with a design from Jerry Baumeister and modified it to beep the altitude in feet automaticly after it gets close to the ground. I also used some deployment plans from Bernard Willaert in Belgium. I had the electronics part finished and destroyed it when the parachute was not packed properly, and pushed the door open on liftoff.
A little explanation about how it
I had a request to change my code so that the
guy could track the altitude of a Falcon. You can read about
it on my Tiny
|Here is the circuit board with all the stuff on
it. You can almost
read the print on the capacitor. Yep that says,
OK, funny story....
To test it out the assembly, I charged the capacitor to ~300V. Then I turned on the switch and listened to it initialize and take it's zero reading. Now in order to simulate the travel to a higher altitude, I had to decrease the pressure on the barometric sensor. How did I do that you ask? Well while it was still in my proto/experimenters board, I had tube connected to the sensor and I sucked on it with my mouth. Easy enough right. Well, I had cut the part off that held the tube to save a little weight. Right, so what I did next was "brilliant". I put my lips up to the sensor itself and was going to inhale lightly. Instead, I exhaled loud profanity as three hundred volts past to my lips and thumb. POW!!!
I forgot to flip my circuit board transfer before ironing it on, so the PIC micro controller is on the wrong side. Oh well, it works this way too.
|Picture of circuits (click on the picture to
see a larger one.)
Start with Jerry Baumeister's part list
The part number for the piezo buzzer is
|You will also need to make a 300 volt charger from a one time use camera. Follow Bernard Willaert's directions for this.|
You will have to right click on the link and select save
I used Bruce Berggren's launcher design (dead link)
Tim Sumrall has some good ideas (dead link)
Jon Mehlferber has a way to thermoform bulkheads for FTC rockets
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