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--- uphp:functions:ow_first [2017/05/11 23:30]
jeff
+++ uphp:functions:ow_first [2021/09/13 05:57]
@@ Line 1: / Line 1: @@
-======ow_first======
-<badge>WMPRO >= 1.0</badge> <badge>WMMEGA FW >= 2.0</badge>
-Initiate a OneWire bus scan and return the address of the first device found
-====Description====
-<well size="sm"><html>
-<span style="font-size:125%;color:green">mixed
-<span style="color:black">ow_first ( )
-</html></well>
-This function starts a new OneWire bus scan and provides the address of the first device found.  Currently only DS18B20 temperature sensors are detectable.
-====Parameters====
-None
-====Return Values====
-An <html><b><span style="color:green">array<span style="color:black"></b> of 8 elements containing the unique OneWire address.  Returns <b><span style="color:green">int<span style="color:black"></b> 0 if no devices were detected.</html>
-====Example====
-<code php>
-<?
-  $arr=ow_first();
-  if ($arr) {
-    $devname=sprintf("%02X%02X%02X%02X%02X%02X%02X%02X",$arr[0],$arr[1],$arr[2],$arr[3],$arr[4],$arr[5],$arr[6],$arr[7]);
-    print("Detected the first OneWire device ".$devname);
-  } else {
-    print("No devices detected.");
-  }
-?>
-</code>
-====See Also====
-[[ow_next()]] - Return the address of the next OneWire device found (after an ow_first)
-[[ow_read()]] - Read a byte from the OneWire bus
-[[ow_read_temp()]] - Read a temperature from a device on the OneWire bus
-[[ow_reset()]] - Reset the OneWire bus
-[[ow_write()]] - Write a byte to the OneWire bus

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