Airframe Test Computer for the LV2c Recovery System Test
Preliminary information on the "quick hack" LPC2148-based timer system used to test the LV2c recovery system in a, umm, ahh, a live aerial test of the system.
The system is based on:
- An Olimex LPC-2148H board (here are the schematics and the dimensions.
- A Sparkfun VTI SCP1000 breakout board (here is the schematics).
- Two 9V batteries.
- Two logic level MOSFET switches.
- A bright red LED.
- A "static line" which is a shorted coaxial connector to act as the trigger the device.
The initial specifications are:
Here's how we envision using it:
fire2_timeoutvalues and program them in to the LPC2148.
- Test the system (see "Deployment" below) but INSTEAD OF THE IGNITERS use two low wattage 12V incandescent bulbs.
- Put on the two "REMOVE BEFORE FLIGHT" shorting blocks.
- Attch each of the two 9V batteries leads to the terminal block.
- The green (?) power LED should come on.
- Attach the Separatation Ring System (SRS) igniter to the Igniter 1 terminal block.
- Attach the Line Cutter System (LCS) igniter to the Igniter 2 terminal block.
- Strap the Test Computer onto the airframe (good luck!).
- Go 2,000ft up.
- Attach the shorting coaxial connector securely to something that stays at 2,000ft.
- Carefully plug in the shorting coaxial connector into the pigtail.
- Verify that the red LED is solid on.
- Carefully remove BOTH of the "REMOVE BEFORE FLIGHT" shorting blocks and store them in a safe place.
- Get ready to drop the recovery system.
- Drop the recovery system such that the shorting coaxial connector gets pulled out as the system drops.
- Go 2,00ft down.
- DO NOT UNPLUG ANYTHING.
- Hook up a serial cable to the serial connector.
- Tell the LPC2148 to print all of the pressure sensor readings.
- Capture and verify you got the data.
- Unplug everything