Search found 66 matches

by Rris
Tue 07 Dec 07 2010 12:20 am
Forum: Space Balloon Project
Topic: Scorpion Controller Board
Replies: 19
Views: 11985

Scorpion Controller Board

My controller board with have a NXP LPC2388 ARM 7 at it's core. It will be shielded by: 903-1054-1-ND BOARD SHIELD 1.0X1.5" FRAME with 903-1017-ND BOARD SHIELD 1.0X1.5" COVER over it. The processor will run the TinyCLR .Net Micro Framework Port. It will have a uSD connector for logging and possibly ...
by Rris
Mon 06 Dec 06 2010 6:06 pm
Forum: Space Balloon Project
Topic: GPS Flight telemetry
Replies: 18
Views: 10737

Re: GPS Flight telemetry

Sorry for replying late, had a very busy trip outside Taiwan last week. SUP500F has poor performance at 10Hz due to self-interference coming from the chipset CPU. 5Hz performance is somewhat degraded, 10Hz is much degraded. Venus638FLPx will still have the same problem if making into something like...
by Rris
Mon 06 Dec 06 2010 6:05 pm
Forum: Space Balloon Project
Topic: RF Links
Replies: 11
Views: 7737

Re: RF Links

I bought the Aerocomm dev kit from digikey as well as a few sensors to test (temp/humidity) and RF shields for the PCB.
by Rris
Mon 06 Dec 06 2010 5:10 pm
Forum: Space Balloon Project
Topic: GPS Flight telemetry
Replies: 18
Views: 10737

Re: GPS Flight telemetry

Venux 634 and 638 have the same land pattern, except 638 adds a ball grid array to the bottom. This adds extra ground points and what appears to be a SPI interface (from only looking at the pin labels).

So, if we design for the 638 we can still use the 634 on it no problems.
by Rris
Mon 06 Dec 06 2010 3:35 pm
Forum: Space Balloon Project
Topic: RF Links
Replies: 11
Views: 7737

Re: RF Links

I'm going to get a AC9790 dev kit. It has breakouts for the modules which makes life easy.. peer to peer with aerocomm: MASTERLESS ARCHITECTURE The Masterless architecture is a true peer-to-peer architecture, where any module that has data to transmit will initiate a communication Session with a tra...
by Rris
Mon 06 Dec 06 2010 1:48 pm
Forum: Space Balloon Project
Topic: RF Links
Replies: 11
Views: 7737

Re: RF Links

i couldnt work out the difference between AC4790 and AC4790LR. The LR is, as i suspected Long Range. Digikey's website specs are wrong, saying that both are -110dbm. Range, Line of Site (based on 3dBi gain antenna) AC4790-1x1: Up to 1 mile AC4790-200: Up to 4 miles AC4790LR-200: Up to 8 miles AC4790...
by Rris
Mon 06 Dec 06 2010 1:15 pm
Forum: Space Balloon Project
Topic: RF Links
Replies: 11
Views: 7737

Re: RF Links

Looks like Xbee Pro XSC wont do what we want - it's only rated to about 10km which is nowhere near enough. XTend 900 mhz units from Maxstream will do, however they are $180 each! Aerocomm don't quite have the 40km range that the xtends do (32km) however are less than half the price. http://search.di...
by Rris
Sat 04 Dec 04 2010 1:25 pm
Forum: Space Balloon Project
Topic: Adhesives
Replies: 1
Views: 3232

Re: Adhesives

thats a really good point, something we certainly need to test!
by Rris
Fri 03 Dec 03 2010 3:34 pm
Forum: Space Balloon Project
Topic: Balloon suppliers
Replies: 0
Views: 6663

Balloon suppliers

http://www.kaymont.com/pages/cold-weather-balloons.cfm - have sent an enquiry to them. Their balloons turn up on ebay for about $30. http://www.yunhuanelectronics.com/Meteorological_balloons_manufactured.htm http://www.alibaba.com/showroom/meteorological-balloon.html http://www.hwoyee.com/ http://ww...