diff --git a/common/constants.hpp b/common/constants.hpp
new file mode 100644
index 0000000..8774f8f
--- /dev/null
+++ b/common/constants.hpp
@@ -0,0 +1,54 @@
+// Copyright 2022 Haute école d'ingénierie et d'architecture de Fribourg
+//
+// 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.
+
+/****************************************************************************
+ * @file constants.hpp
+ * @author Serge Ayer <serge.ayer@hefr.ch>
+ *
+ * @brief Constants definition used for implementing the bike system
+ *
+ * @date 2023-08-20
+ * @version 1.0.0
+ ***************************************************************************/
+
+#pragma once
+
+#include <stdint.h>
+
+#include "mbed.h"
+
+namespace bike_computer {
+
+// gear related constants
+static constexpr uint8_t kMinGear = 1;
+static constexpr uint8_t kMaxGear = 9;
+// smallest gear (= 1) corresponds to a gear size of 20
+// when the gear increases, the gear size descreases
+static constexpr uint8_t kMaxGearSize = 20;
+static constexpr uint8_t kMinGearSize = kMaxGearSize - kMaxGear;
+
+// pedal related constants
+// When compiling and linking with gcc, we get a link error when using static
+// constexpr. The error is related to template instantiation.
+
+// definition of pedal rotation initial time (corresponds to 80 turn / min)
+static constexpr std::chrono::milliseconds kInitialPedalRotationTime = 750ms;
+// definition of pedal minimal rotation time (corresponds to 160 turn / min)
+static constexpr std::chrono::milliseconds kMinPedalRotationTime = 375ms;
+// definition of pedal maximal rotation time (corresponds to 10 turn / min)
+static constexpr std::chrono::milliseconds kMaxPedalRotationTime = 1500ms;
+// definition of pedal rotation time change upon acceleration/deceleration
+static constexpr std::chrono::milliseconds kDeltaPedalRotationTime = 25ms;
+
+}  // namespace bike_computer
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diff --git a/common/sensor_device.cpp b/common/sensor_device.cpp
new file mode 100644
index 0000000..4aa7ef2
--- /dev/null
+++ b/common/sensor_device.cpp
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+#include "sensor_device.hpp"
+
+namespace bike_computer {
+
+SensorDevice::SensorDevice() : _hdc1000(I2C_SDA, I2C_SCL, STMOD_11) 
+{}
+
+bool SensorDevice::init() {
+    return this->_hdc1000.probe();
+}
+
+float SensorDevice::readTemperature(void) {
+    return this->_hdc1000.getTemperature();
+}
+
+float SensorDevice::readHumidity(void) {
+    return this->_hdc1000.getHumidity();
+}
+
+} // bike_computer
+
diff --git a/common/sensor_device.hpp b/common/sensor_device.hpp
new file mode 100644
index 0000000..d6ead2c
--- /dev/null
+++ b/common/sensor_device.hpp
@@ -0,0 +1,49 @@
+// Copyright 2022 Haute école d'ingénierie et d'architecture de Fribourg
+//
+// 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.
+
+/****************************************************************************
+ * @file sensor_device.hpp
+ * @author Serge Ayer <serge.ayer@hefr.ch>
+ *
+ * @brief SensorDevice header file (static scheduling)
+ *
+ * @date 2023-08-20
+ * @version 1.0.0
+ ***************************************************************************/
+
+#pragma once
+
+#include "hdc1000.hpp"
+#include "mbed.h"
+
+namespace bike_computer {
+
+class SensorDevice {
+   public:
+    // constructor
+    SensorDevice();
+
+    // method for initializing the device
+    bool init();
+
+    // methods used for
+    float readTemperature(void);
+    float readHumidity(void);
+
+   private:
+    // data members
+    advembsof::HDC1000 _hdc1000;
+};
+
+}  // namespace bike_computer
\ No newline at end of file