All, Sorry I missed last Wednesday's meeting, but I wasn't quite ready with the BOB4 evaluation board. Since then, I've finished the board and also made a lot of e-mail progress on a DVR and the ARTS2 flight computer.
1. BOB4 text overlay demo board. I finally finished the breadboard that lets us set up the BOB4 from a PC or from a serial port on the lpc2148 Olimex board. I'll be playing with the PC-based configuration program, but Decade Engineering has example C code that we can adapt for the free-rtos LPC control. Wouldn't you know it? Decade Engineering just released XBOB-4 a standalone version of BOB-4 in a box. Oh, well, I understand the BOB-4 hookup issues so much better 'cause I mad it up on the fly. 2. ARTS 2 flight controller. This, as many of you know, is going to control the recovery system for the LV2-c airframe test flight(s). It can fire two electric matches independently, based on about 5 different conditions. All these are programmable ahead of time. The board includes an accelerometer and an altimeter. Typically, i.e., preprogrammed modes, the accelerometer is used to detect apogee, usually to deploy the drogue 'chute and the altimeter is used to deploy the main parachute. The programmable conditions for lighting either electric match are: Launch MECO - Main engine Cutoff Apogee Altitude going up Altitude going down Plus, you can configure a delay after the selected event, e.g., 10 seconds after apogee. The ARTS 2 records altitude and acceleration at a sample rate of your choosing. After the flight you can download the data for analysis. I e-mailed Erik Hall at Ozark to see if we could get the data in real time, to add to the video text overlay. The short answer is "yes." The long answer has to wait until he returns from a trip -- maybe next Wednesday. So far, so good. 3. DVR inside the rocket. Last week we discussed the possibility of adding a solid state (i.e. SD Flash card) digital video recorder inside the rocket, in case we suffer any video recording problems on the ground (how could that possibly happen???) The good news is that the private investigator market has spawned several high quality units. I'll bring information next Wednesday. There is indeed a very nice unit that appears to satisfy all our wants in size, quality/capacity, controllability, etc. At $549.00 it isn't cheap, though. It's something to think about. Hope ta see all y'all on Wednesday, frank _______________________________________________ psas-team mailing list psas-team@lists.psas.pdx.edu http://lists.psas.pdx.edu/mailman/listinfo/psas-team This list's membership is automatically generated from the memberships of the psas-airframe, psas-avionics, and psas-general mail lists. Visit http://lists.psas.pdx.edu to individually subscribe/unsubscribe yourself from these lists.