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May 2, 2006
about 7 years ago
what part of the hardware or firmware allows the device to appear as a mass storage device via usb?
News - Nordic FCC Study
about 7 years ago
I do my research work in this space, and I’m a big proponent of Bluetooth at 2.4Ghz. Bluetooth has a number of advantages :
- prevelance in existing electronics
- multiple protocol stacks implemented
- lower current consumption per bit than most other protocols
- higher data throughput
- high power & high data rate options available
- built-in DUN (dialup networking) allows for simplified telemetry over the cellualar network
News - Power Supply Protection
about 8 years ago
I’ve used bridge rectifiers, but with either a diode solution or a bridge rectifier, you need to be aware of the current requirements. A rectifier needs to dissipate 1.2V * Current in Watts. At 2A, your generating 2.4W of heat, which might burn out the rectifier or cause other problems.
about 9 years ago
Or, get the most sensitive sensor they make - ST75 I think - which has leads metric spaced leads (1.27mm) already attached for $32ish a pop from newark. Just got 10 myself for a discount plus used some 10% off coupon code.
The thing works great, though the temp reading takes longer than the humidity - and I really dont know what I need 14 bits of precision for something that’s only +/- 1.8% accurate.
They also give you a non-linear curve fit equation and another one that does temperature compensation for humidity. Very sensitive - i can blow on it from 5 feet away and it notices.
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