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The former allows you to manually modify all profile parameters with the LCD and a couple of push buttons. The latter manages all of the successive steps of the thermal profile and reads the actual oven temperature in real time. Let’s look at the details. First, a welcome screen is displayed. Then, a static screen displays the current temperature in real time and allows Photo 3—When it’s running, the controller shows the current phase (“UpDry,” meaning “up to drying temperature”), and the preset and actual temperatures, as well as the remaining time to spend in this phase.

How can you integrate this simple frame grabber into a product? What about adding an SPI-based secure digital (SD) flash card on the SPI interface of the Atmel MCU and turning this into a simple digital camera? You could save a large numPhoto 2—The frame grabber circuit acquired this image. Also shown is a screen capture of the Windows-based PC control and viewing software. All ber of images in raw communications occur over a standard RS-232 serial port. format to the flash card (or with a file system).

Although the status flags weren’t used by the current version of the user interface controller, they were 46 Issue 168 July 2004 handy when debugging with the terminal program. I can use them to update ASCII Character status LEDs if I update the user interface controller code in the future. The Waveform capture unit response Internal action taken when received by waveform capture unit Action taken when received by user I/O controller Function code 0 1 2 3 4 5 6 7 8 9 : ; < Timebase value Timebase value Timebase value Timebase value Timebase value Timebase value Timebase value Timebase value Timebase value Timebase value Timebase value Timebase value Timebase value Set sampling to 1 µs Set sampling to 2 µs Set sampling to 5 µs Set sampling to 10 µs Set sampling to 20 µs Set sampling to 50 µs Set sampling to 100 µs Set sampling to 200 µs Set sampling to 500 µs Set sampling to 1,000 µs Set sampling to 2,000 µs Set sampling to 5,000 µs Set sampling to 10,000 µs Display “1–6” Display “2–6” Display “5–6” Display “10–6” Display “20–6” Display “50–6” Display “1–4” Display “2–4” Display “5–4” Display “1–3” Display “2–3” Display “5–3” Display “10–3” Button code A,a C,c D,d E,e F,f I,i Status flags Status flags Status flags, Timebase value Status flags Status flags Status flags, Timebase value Toggle triggered/free run Toggle capture enable on/off Decrement timebase Toggle auto erase Toggle trigger polarity Increment timebase None None None None None None Table 1—These ASCII codes can be received by either the waveform capture controller to set capture parameters or by the user interface controller to set the timebase display.

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