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projects:thegadget [20110429-1326]
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projects:thegadget [20140312-0311] (current)
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 | Switched mode power supply module ​ |    | Recom 9-36V in, 5V out    ||| $20 || | Switched mode power supply module ​ |    | Recom 9-36V in, 5V out    ||| $20 ||
 | current limits / under-voltage trips |          | custom (bullet-proof) BJT latch + fuse |||      || | current limits / under-voltage trips |          | custom (bullet-proof) BJT latch + fuse |||      ||
 +
 +===== Progress =====
 +
 +The Gumstix overo-fire and chestnut43 boots from an RC car battery with 5V SMPS and an over-current under-voltage lockout circuit (set to <1A, >9V on the 11.1V input rail, schematics coming soon!)
 +
 +The Gumstix system consumes about 0.45A at 12V. Far too much for a portable device, but most of that is the LCD back-light.
 +
 +Oddly, the Gumstix module refuses to connect to a USB device without a USB hub (powered or unpowered) so the gadget will have multiple USB sockets, some populated by internal devices.
 +
 +An Arduino pro-mini will be used (for now) to control the sensors and output devices. The final version will probably use a low-power micro-controller for data logging, power management and anything an OS isn't required for (whatever I can be bothered hard-coding on a micro)
 +The pro-mini currently collects data from a barometer, humidity sensor and a magnetometer and displays it on a character LCD.
  
  
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