Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- distanz_sensor_sharp_2y0a_familie [2020/05/11 13:32] – 192.168.1.57
+++ distanz_sensor_sharp_2y0a_familie [2022/01/09 14:41] (aktuell) – Externe Bearbeitung 127.0.0.1
@@ Zeile 1: / Zeile 1: @@
 ====== Distanz Sensore Sharp 2Y0A Familie ======
+see cpp code in Githup[[https://github.com/zoubworldArduino/ZSharpIR]]
 ===== Sharp 2Y0A710K0F 100-500cm =====
-Formel
+Python code at [[https://tutorials-raspberrypi.de/infrarot-abstandsmessung-mit-dem-raspberry-pi-sharp-gp2y0a02yk0f/]]
 Model: "100500" [100cm to 500cm]
@@ Zeile 7: / 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 =====
@@ Zeile 15: / Zeile 38: @@
 Model: "1080" [10cm to 80cm]
-Volt	Distance
+^Volt ^Distance^
-,6	10
+|2,6|10 |
-,1	12
+|2,1|12|
-,85	14
+|1,85|14|
-,65	15
+|1,65|15|
-,5	18
+|1,5|18 |
-,39	20
+|1,39|20|
-,15	25
+|1,15|25|
-,98	30
+|0,98|30|
-,85	35
+|0,85|35|
-,75	40
+|0,75|40|
-,67	45
+|0,67|45|
-,61	50
+|0,61|50|
-,59	55
+|0,59|55|
-,55	60
+|0,55|60|
-,5	65
+|0,5|65 |
-,48	70
+|0,48|70|
-,45	75
+|0,45|75|
-,42	80
+|0,42|80|
 Using MS Excel, we can calculate function (For distance > 10cm) :
-Distance = 29.988 X POW(Volt , -1.173)
+<code>Distance = 29.988 X POW(Volt , -1.173)</code>