Download PDF by Steve Ciarcia: Circuit Cellar June 2010

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You can use the same components to automate yours. The system is truly scalable from two nodes without a server, through the setup described here, all the way up to much bigger systems. Just adjust the number of individual CAN bus networks and nodes as needed. There are other uses beyond home automation for the nodes. For example, I use one of the DIN rail modules at work on a rotating propeller rig, acquiring data from strain gauges and transmitting it through a slip ring to a PC CAN interface.

It’s funny: when you see it on the scope, you start to hear your own pulse! Instead of attempting to filter out b) Photo 8a—Otoacoustic stimulation clicks in an artificial ear. Note how there is no response (or echos) after the stimulation clicks. This artificial ear canal is perfect for calibrating experiments. b—Otoacoustic stimulation clicks and resulting OAEs from my ears. The closer the responses are to the stimulation clicks, the healthier the ear (in general). com • CIRCUIT CELLAR® June 2010 – Issue 239 a) the pulse in either the analog or digital domain, it made more sense to use the slow, steady heartbeat to trigger the otoacoustic stimulation pulses—which would, in turn, trigger the PC oscilloscope and display some useful data.

You’ll want to populate the run and error LEDs and their resistors, as these provide visual information on the status of the node to the user. The remaining switches and LEDs are optional. In terms of functionality, each switch is doubled to provide mechanical support for the switch plate. If you use this board for only a single switch, you can get away with a minimum of three switches (like left top and bottom, center right). Four (two top, two bottom) will provide the functionality of a double switch, and all six a triple switch.

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Circuit Cellar June 2010 by Steve Ciarcia

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