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--- en:netzer:impulse [2014/08/17 16:10] – Reordered headlines svesch
+++ en:netzer:impulse [2025/06/11 20:42] (current) – external edit 127.0.0.1
@@ Line 68: / Line 68: @@
+==== Measuring impulses in continuous mode (Unsynchronized) ====
+{{ :en:netzer:impulse_capture_cont_unsync.gif?direct |}}
+==== Measuring impulses in single mode (Unsynchronized) ====
+{{ :en:netzer:impulse_capture_single_unsync.gif?direct |}}
+==== Measuring impulses in "Triggered by IO0" mode (Unsynchronized) ====
+This mode shall not be used.
+==== Measuring impulses in continuous mode (IO0 synchronized) ====
+This mode shall not be used.
+==== Measuring impulses in single mode (IO0 synchronized) ====
+{{ :en:netzer:impulse_capture_single_sync.gif?direct |}}
+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.
+{{ :en:netzer:impulse_capture_io0_sync2.gif?direct |}}
+==== Measuring impulses in „Triggered by IO0“ mode (IO0 synchronized) ====
+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 period length the IO0 trigger edge and the capture edge must be equal (like IO3 in image below).
+For positive pulses the IO0 trigger edge must be rising, the capture edge falling edge (like SPI_INT in image below).
+For negative pulses the IO0 trigger edge must be falling, the capture edge rising edge.
+{{ :en:netzer:impulse_capture_io0_sync.gif?direct |}}