Without having mobility/size/wattage constraints.... http://www.measurementcomputing.com/ http://www.measurementcomputing.com/dasylab.html Measurement computing does USB modules reasonably cheaply, and they have a labview style development system for logging and display - of course this requires a PC though. >>> shb7@cornell.edu 19 Sep 07 14:59:13 >>> Hi all, I often run into situations where a device behaves fine "on the bench" but not when installed (in this case, in a mobile robot). If I had a device which could monitor and record several analog and digital signals, store this data, and was battery powered, I could install it in the robot and gather debugging data under actual circumstances. I've looked at various dataloggers (the only name I know for something like this) and none had the specs I need. Most had sampling rates which were too low. Others had too little memory. Also, ideally, I'd want something with trigger capabilities (for example, start recording when a line goes high, start recording on a rising edge of an analog signal, etc.) and maybe the ability to record a synchronous or async serial signal. I haven't found such a device. Here's a description of something which would fit the bill: 2 or more channels of analog input with an adjustable sample rate (with a max of at least 1 megasample per second) and a memory depth of at least 1 million samples. 8 bit resolution OK. 5 or more channels of adjustable threshold digital inputs (switchable between 3.3V and 5V logic at least). Similar sample rate and memory depth to analog channels. Several triggering options, including at least triggering on level and edge of digital inputs, and edge of analog input. Should have some ability to start and stop recording and tag those times with a real timestamp. Has anyone found something like this? Even if it runs into significant $, I wouldn't mind because of the time it would save. Thanks, Sean -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist