View Full Version : Free Fall Accelerometer

Paul Verhage
05-23-2006, 11:31 PM
I'm going to experiment with using the H48C on a near space project. It has a free fall detector that the documentation says is an output, active high. There's no wiring schematic, so I'm assuming I can connect the pin directly to a Stamp (without a current limiting resistor). Is that right?

When a balloon bursts, the near spacecraft begins falling. I figure I can connect the freee fall pin to the psuedo interrupt of a BS2p. That way my flight computer will know the balloon has burst in less than a second after the fact.

Did you know gravity is 1% less at 100,000 feet? I don't know if I'll be able to detect this with the swinging of the balloon. But if I don't try, I know I never well.


Charlie Johnson
05-24-2006, 01:26 AM

You may want to put a 10K pull down resister on pin 4 (Zero-G), so it does not float. Parallax may have already done this on the breakout board, but don't have one to check.


Chris Savage
05-24-2006, 02:35 AM
This thread is being moved from the Projects Forum to the BASIC Stamp Forum.

Chris Savage
Parallax Tech Support
csavage@parallax.com (mailto:csavage@parallax.com)