2 - What inputs will be provided
3 - 2x ADC channels, USB Hub (2 webcams?)
4 - What outputs are required
5 - 2x digital out for controlling multiplexers on ADCs
6 - Switch time for multiplexer? Affects sample rate
7 - 1x PWM to control DAC -> Analogue pressure regulator (?)
8 - 3x digital out for controlling solenoids
9 - Need to meet this week to work out sampling rate / antialiasing stuff
10 - Friday 12:00pm -> 2:00pm
11 - Wednesday 10:00am -> 11:00am
12 - Antialiasing: Need to sample at 2x rate we are interested in
13 - Accuracy of timestamps in software uncertain; should do some physical tests
14 - Estimates of BBB sampling rates vary, but from Jeremy's searches, the worst case:
19 - What is being controlled -> Electronics
20 - Analogue controlled pressure regulator 0-5V
21 - 3 solenoids (on/off)
22 - Master valve (safety)
23 - 1 valve for each can (mutually exclusive, never allow both to be on at the same time) - need 12V for on, 20ms switch time, max freq 10Hz
24 - Electronics will probably use a multiplexer
25 - Will dump air when no power
26 - Diode protection needed
27 - When can fails, major drop in pressure will happen
28 - Should stop air supply when this is detected
30 - 3 x pressure sensors; 1 on main supply, 1 before each can
31 - Pressure limit of 100KPa on non-exploding can
32 - Safety threshold if sensor after this records > 100KPa
33 - No limit on exploding can
34 - Forgot to ask about *minimum* pressure values; use atmosphere (because if things fall below atmosphere they are probably broken)?
37 - Sensors -> Electronics -> Us
38 - Currently having argument with Adrian about use of interferometer or dilatometer
39 - Adrian will probably win the argument
40 - Image processing will be low priority for software until there is more certainty
41 - From a software point of view, interferometer and dilatometer are about the same difficulty
42 - Interferometer: Look for nodes (maximum change in intensity at laser wavelength)
43 - Dilatometer: Look for edge of can (maximum change in intensity of can colour)
44 - Laser light might be easier to process (larger intensity and larger intensity changes against dark background)
45 - But laser interferometer kit will definitely be harder to set up and align and position
46 - Sampling rate of images (stream only) - 20FPS (using Logicrap(TM) camera)
50 - The software will fit
51 - There will be a hole for an ethernet cable