From 8559c8bbb1c58992be75ca8643233421c1d6326b Mon Sep 17 00:00:00 2001
From: Markus Sattler <help.markus+git@gmail.com>
Date: Sun, 21 Jun 2015 22:19:23 +0200
Subject: [PATCH] add pull up option to OneWire see #447

---
 libraries/OneWire/OneWire.cpp | 8 ++++++--
 libraries/OneWire/OneWire.h   | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/libraries/OneWire/OneWire.cpp b/libraries/OneWire/OneWire.cpp
index 593053794..7fbedd408 100644
--- a/libraries/OneWire/OneWire.cpp
+++ b/libraries/OneWire/OneWire.cpp
@@ -117,9 +117,13 @@ sample code bearing this copyright.
 #include "OneWire.h"
 
 
-OneWire::OneWire(uint8_t pin)
+OneWire::OneWire(uint8_t pin, bool pullup)
 {
-	pinMode(pin, INPUT_PULLUP);
+    if(pullup) {
+        pinMode(pin, INPUT_PULLUP);
+    } else {
+        pinMode(pin, INPUT);
+    }
 	bitmask = PIN_TO_BITMASK(pin);
 	baseReg = PIN_TO_BASEREG(pin);
 #if ONEWIRE_SEARCH
diff --git a/libraries/OneWire/OneWire.h b/libraries/OneWire/OneWire.h
index 6ff16745a..68cc25f58 100644
--- a/libraries/OneWire/OneWire.h
+++ b/libraries/OneWire/OneWire.h
@@ -135,7 +135,7 @@ class OneWire
 #endif
 
   public:
-    OneWire( uint8_t pin);
+    OneWire(uint8_t pin, bool pullup = true);
 
     // Perform a 1-Wire reset cycle. Returns 1 if a device responds
     // with a presence pulse.  Returns 0 if there is no device or the