Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- distanz_sensor_sharp_2y0a_familie [2020/05/11 13:59] – 192.168.1.57
+++ distanz_sensor_sharp_2y0a_familie [2022/01/09 14:41] (aktuell) – Externe Bearbeitung 127.0.0.1
@@ Zeile 9: / Zeile 9: @@
 Based on the SHARP datasheet we can calculate the linear function:
 <code> y = 137500x + 1125 which gives us: 1 / ((Volt - 1125) / 137500) = distance_in_cm (For distance > 100cm) </code>
+==== Python code ====
+<code>
+#!/usr/bin/python
+import spidev
+spi = spidev.SpiDev()
+spi.open(0,0)
+def readChannel(channel):
+  val = spi.xfer2([1,(8+channel)<<4,0])
+  data = ((val[1]&3) << 8) + val[2]
+  return data
+if __name__ == "__main__":
+  v=(readChannel(0)/1023.0)*3.3
+  dist = 16.2537 * v**4 - 129.893 * v**3 + 382.268 * v**2 - 512.611 * v + 301.439
+  print "Distanz: %.2f cm" % dist
+</code>
 ===== Sharp 2Y0A21YK 10-80cm =====