Search found 66 matches

by Rris
Wed 08 Dec 08 2010 10:24 pm
Forum: Space Balloon Project
Topic: Scorpion Controller Board
Replies: 19
Views: 12125

Re: Scorpion Controller Board

this is just me laying out sections at a time, not the final design. I'm working on the schematic first and foremost and then putting the bits together onto the PCB. In the past we've done the whole schematic then it's a pain to find all the bits that go together - so i thought i'd work on a "block"...
by Rris
Wed 08 Dec 08 2010 8:49 pm
Forum: Space Balloon Project
Topic: Scorpion Controller Board
Replies: 19
Views: 12125

Re: Scorpion Controller Board

Powersupplies added. Schematics reated with National's WEBENCH specific to each voltage output based on a 6s lipo input. I changed the diodes to MBRS340T3G's that i have on stock (much less heat with them) and change the inductors to shielded, as well as changing the electrolytics on the 5v to 7343 ...
by Rris
Wed 08 Dec 08 2010 4:24 pm
Forum: Space Balloon Project
Topic: Scorpion Controller Board
Replies: 19
Views: 12125

Re: Scorpion Controller Board

Finish reading http://www.national.com/an/AN/AN-1229.pdf - very interesting read. According to WEBENCH designer, maximum efficiency i could hope for is about 81.76%. However with parts i have on hand i'll only get 79.82% @ almost empty on the battery, or 78.64% at full charge on a 6s battery. At -30...
by Rris
Wed 08 Dec 08 2010 12:17 pm
Forum: Space Balloon Project
Topic: Scorpion Controller Board
Replies: 19
Views: 12125

Re: Scorpion Controller Board

So i've worked out the power draw i'll require. 3.3V 1485mA 5V 1050mA Based on: Device Voltage mA Draw Milliwatts VideoTX 500mw 2.4ghz 5 450 2250 Aerocomm 1W (100% TX time) 3.3 1300 4290 Geiger Counter 5 30 150 NXP2388 ARM7 3.3 110 363 MicroSD 3.3 20 66 Other Sensors 3.3 10 33 GPS 3.3 35 115.5 GoPro...
by Rris
Wed 08 Dec 08 2010 8:51 am
Forum: Space Balloon Project
Topic: Video/camera systems
Replies: 2
Views: 3352

Re: Video/camera systems

GoPro got back to me about the suitability of the camera for high alt with this link: http://vimeo.com/12331583
by Rris
Wed 08 Dec 08 2010 12:11 am
Forum: Space Balloon Project
Topic: Scorpion Controller Board
Replies: 19
Views: 12125

Re: Scorpion Controller Board

Added footprint for the XT60 connector. It has a protection diode just in case and a 15uf filter cap on it. Battery voltage goes to ADC0. Switched the silly HC-49US SMT format crystal that was on the board (silly GHI) out to a 5x3mm SMT. I'd go smaller but there is heaps of room in the RF shield at ...
by Rris
Tue 07 Dec 07 2010 8:35 pm
Forum: Space Balloon Project
Topic: Scorpion Controller Board
Replies: 19
Views: 12125

Re: Scorpion Controller Board

Tarryn over tonight, so not much progress. Created Venux638 symbol, LBGA69 footprint, and 638 package in Venus library.

GPS is connected to TXD0/RXD0
LED1 is on PWM4 to GND
LED2 is on GPS LED/PIN7
LED3V3 is on 3v3

Added USB host connector.
by Rris
Tue 07 Dec 07 2010 12:32 am
Forum: Space Balloon Project
Topic: GPS Flight telemetry
Replies: 18
Views: 10861

Re: GPS Flight telemetry

by Rris
Tue 07 Dec 07 2010 12:28 am
Forum: Space Balloon Project
Topic: RF Links
Replies: 11
Views: 7870

Re: RF Links

variable, 5mw to 1000mw
by Rris
Tue 07 Dec 07 2010 12:27 am
Forum: Space Balloon Project
Topic: Scorpion Controller Board
Replies: 19
Views: 12125

Re: Scorpion Controller Board

Balloon PCB Day 1: Created objects for the RF shields - attached is excel spreadsheet that helps figure out the commands for positioning the elements of the footprint. Created basic schematic for the LPC2388, uSD and USB client port. Created basic Venus 634 schematic and shielding/gps area basic lay...