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en:netzer:impulse [2014/08/17 16:10] svesch Reordered headlines |
en:netzer:impulse [2014/08/17 16:36] svesch Added exmaples to all supported capture modes. |
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| + | ==== Measuring impulses in continuous mode (Unsynchronized) ==== | ||
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| + | {{ :en:netzer:impulse_capture_cont_unsync.gif?direct |}} | ||
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| + | ==== Measuring impulses in single mode (Unsynchronized) ==== | ||
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| + | {{ :en:netzer:impulse_capture_single_unsync.gif?direct |}} | ||
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| + | ==== Measuring impulses in "Triggered by IO0" mode (Unsynchronized) ==== | ||
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| + | This mode shall not be used. | ||
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| + | ==== Measuring impulses in continuous mode (IO0 synchronized) ==== | ||
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| + | This mode shall not be used. | ||
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| + | ==== Measuring impulses in single mode (IO0 synchronized) ==== | ||
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| + | {{ :en:netzer:impulse_capture_single_sync.gif?direct |}} | ||
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| + | The second example shows the special case of an ultrasonic sensor like HC-SR04. | ||
| + | This sensor needs a 10 µs impulse at the TRIG input which shall be connected to IO3. | ||
| + | The pulse length of sensor singnal ECHO decodes the distance to the detected object. | ||
| + | The signal must be connected to IO0 and SPI_INT. | ||
| + | IO0 must be configured for rising trigger edge, SPI_INT for falling capture edge. | ||
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| + | {{ :en:netzer:impulse_capture_io0_sync2.gif?direct |}} | ||
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| + | ==== Measuring impulses in „Triggered by IO0“ mode (IO0 synchronized) ==== | ||
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| + | In this mode the periode of periodic signals or pulse length can be measured. | ||
| + | Connect the signal to measure to IO0 and IO3 or SPI_INT or both. | ||
| + | For periode length the IO0 trigger edge and the capture edge must be equal. | ||
| + | For positive pulses the IO0 trigger edge must be rising, the capture edge falling edge. | ||
| + | For negative pulses the IO0 trigger edge must be falling, the capture edge rising edge. | ||
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| + | {{ :en:netzer:impulse_capture_io0_sync.gif?direct |}} | ||
