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4’s tkinter module to create the GUI, and CALIBRATION & SIMULATION installed the tkSnack module for The stimulation clicks are proreal-time sound recording, generaduced by one of the two speakers in tion, and playback capabilities. Once the earpiece. ) In open manipulate the interface controls, I air, the microphone does not pick up wrote logic that was supposed to the stimulation clicks at all; the isoautomatically run a “transient clicklation between the transducers is evoked otoacoustic emission” expervery good.

The main surprise for me, though, was how stable the software on the embedded nodes runs once debugged—and even more so, how robust the CAN bus is against all sort of hard-and software abuse. None of the initial issues in getting the system to work were related to the bus itself, which now truly has been up and running for the entire time we have lived in the house without any shutdown. While we took what I would call in retrospect quite a gamble in betting on this untested system to perform, it all has worked out well.

RELAY DAUGHTER BOARD This is an add-on module to the basic Switch module that provides two relays and four open-collector outputs. com • CIRCUIT CELLAR® you intend to switch. In either case, these are bi-stable relays in order to minimize power consumption on the bus. They will maintain either on or off state without a coil current once they have been toggled which takes only about 500 ms. Figure 3 and Photos 3a–3c show the switch daughter board. The ULN2803 is an eight-channel open-collector driver, which also has integrated diodes to prevent voltage spikes induced by the relay’s coils.

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