4030 datasheet
by July 01, 2010 A story of the electronics and logistics of launching a high altitude balloon. Remember, they got their units back, my box is still sitting out there somewhere . Things get tricky because you don't know when to take the photo s , and at an altitude of 30km 100,000ft , things get really cold. And throw the electronics inside: This is David's payload - pretty clean. It's a 1 to 4 mux for all the serial connections: GPS, logging, radio, +1 more maybe add serial LCD someday . GPS: , 3.3V, Serial/4 wires. With a 5Hz update rate and a fast location lock, this GPS module is a work horse and works great. When GPS was created, the US Department of Defense did not want other countries or individuals using GPS to do bad things like guide missiles they kept that ability for themselves . Almost all non-military GPS units are crippled - the receivers won't work correctly at extreme heights or extreme speeds. Civilian GPS use is fairly slow, and low altitude, so we rarely notice these limitations. All GPS receivers capable of functioning above 18 km 60,000 ft altitude and 515 m/s 1,000 knots are classified as munitions weapons for which U.S. State Department export licenses are required. These limits are clearly chosen to prevent use of a receiver in a ; This has caused problems with some amateur radio balloon launches as they regularly reach 30 km 100,000 feet . Since I want to use GPS for location and recovery only, the LS20031 should be able to handle both high altitudes and longitude/latitude at those altitudes. Accelerometer: , 3.3V, I2C. The GPS should give us altitude so we can tell decent rates, but I want to know more. Magneto: , 3.3V, I2C. The magnetometer will give us an idea of where we are pointed for example, facing north when we took picture X .
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