Diff: Grove_temperature.cpp

Revision:

0:d4056a86ef8c

Child:

1:aee37a51ccbb

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Grove_temperature.cpp	Mon Aug 06 09:22:23 2018 +0000
@@ -0,0 +1,46 @@
+
+/**
+ ******************************************************************************
+ * @file    Grove_temperature.cpp
+ * @author  Toyomasa Watarai
+ * @version V1.0.0
+ * @date    6 Aug 2018
+ * @brief   Seeed grove temperature sensor class implementation
+ ******************************************************************************
+ * @attention
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+ #include "Grove_temperature.h"
+
+Grove_temperature::Grove_temperature(PinName ain)
+    : _ain(ain)
+{
+}
+
+Grove_temperature::~Grove_temperature()
+{
+}
+
+float Grove_temperature::getTemperature()
+{
+    const int B = 4275;               // B value of the thermistor
+    const int R0 = 100000;            // R0 = 100k
+
+    float R = 1.0f/_ain.read() - 1.0f;
+    R = R0*R;
+
+    float temperature = 1.0/(log(R/R0)/B+1/298.15)-273.15; // convert to temperature via datasheet
+    return temperature;
+}