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I am considering a simple, low cost logging dongle for use in harsh environments: '''HW''' * uProc with UART * RS-232 transceiver (max232) * USB and Serial connectors * regulator * 1Mbyte SPI flash ** Marcell recommends MMC. In an epoxy-potted case it can be soldered without a socket. '''Software''' * Identify VEMS when attached and issue data dump requests - log resulting data stream * Accepts commands when connected to host (PC or PDA) to dump data * On board USB rechargable coin cell or host powered (5V on VEMS DB9 or USB on PC/PDA) '''Conclusion''' BoM, board, assembly and testing = cheap Firmware = easy Podded in epoxy for ruggedness Anyone interested, please chime in. Cost for members should be kept in the $20 range. '''Notes''' * The group effort has (long-pending) plans on the following: ** firmware support for v3.x MMC logging GenBoard/LoggerIntegration is a bit confusing. See GenBoard/LoggerIntegration/MMC ** arm-boost is the codename of the low-cost (no fancy connectors) potted board (under development; 90 ARM uC-s are ordered for it and come in 2006 March) that is mostly sensing / networking / logging (but very restricted when it comes to power outputs). Useful for surprisingly many applications, logging is one. I suggest you join the development - first the MMC firmware _code_ than this. ** It's possible to roll an even smaller board (than arm-boost, perhaps with a different uC to save another $1 with only $900 of development task) but probably only justified if >500 can be sold. *WikiAdvert: mailto:bill@lolachampcar.com
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