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May 2, 2006
about 9 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 9 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 10 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 11 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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