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Product BOB-09981 | about 4 months ago

I can see the error with the IRQ in the schematic. On the chip the net connected to pin 11 is named /IRQ, however the net connected to pin 5 of the header is named IRQ. Eagle didn’t connect the two pins because the nets are mislabeled.

Product CEL-10138 | about 4 months ago

I too was able to get this board working. I made the mistake of buying a $3 GoPhone for the sim card. The GoPhone sim cards are not compatible with this module. However if you go to an ATT store, they will give you a sim card for free. I was able to call the 800 number and have them register the new sim on my GoPhone account and I was in business. If I hadn’t already setup the GoPhone, I would have been able to register the free sim directly on ATTs webpage.

The AIP server that worked for me was “wap.cingular”, no username or password.

Product PRT-09923 | about 2 years ago

Can you post some pictures of these that don’t have a white background?

Tutorial - HAB - Sensor System, Flight Computer, and Radio System | about 2 years ago

The range problem with the radios was likely due to your choice of antennas. The magnetic base whip antennas are designed to be operated over a ground plain (i.e the roof of your car). The styrofoam box was not providing a proper ground plane for your payload antenna. In this case, the rubber duck antenna would have been the better choice (its a dipole and doesn’t require a ground plane). The big jump in range between your walking ground test and the flight day was probably because your base station antenna was on the roof of your car and not stuck to the top of your backpack. The other issue is polarization mismatch. If you mounted the payload antenna parallel to the ground and the base station antenna vertically on the roof of your car, the 90 degree polarization mismatch cost you big time. As previously suggested use a circularly polarized antenna that does not require a ground plane.
Great project! Thanks for sharing.

News - Dear ON Semiconductor | about 2 years ago

This makes more sense than the original copper slug theory. Very interesting, thanks for sharing the story as it has unfolded!

Product SEN-09623 | about 2 years ago

What did you change to make this AHRS compatible?