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Author: 7semi-Tech

src/7semi_ADXL335.cpp

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+/*!
+ * @file 7semi_ADXL335.cpp
+ * @brief Arduino library for the ADXL335 3-axis analog accelerometer
+ * @details This library reads analog voltage from the X, Y, Z outputs of the ADXL335 sensor
+ *          and converts it into raw ADC values, voltage (V), or acceleration (g-force).
+ * @author 7semi
+ * @copyright (c) 2025
+ */
+
+#include "7semi_ADXL335.h"
+
+ADXL335_7semi::ADXL335_7semi(uint8_t xPin, uint8_t yPin, uint8_t zPin)
+    : x_pin(xPin), y_pin(yPin), z_pin(zPin) {
+}
+
+void ADXL335_7semi::begin() {
+  pinMode(x_pin, INPUT);
+  pinMode(y_pin, INPUT);
+  pinMode(z_pin, INPUT);
+}
+
+void ADXL335_7semi::readRaw(int &x, int &y, int &z) {
+  x = analogRead(x_pin);
+  y = analogRead(y_pin);
+  z = analogRead(z_pin);
+}
+
+void ADXL335_7semi::readVoltage(float &x, float &y, float &z) {
+  int rawX, rawY, rawZ;
+  readRaw(rawX, rawY, rawZ);
+
+  x = (rawX / 1023.0) * REF_VOLTAGE;
+  y = (rawY / 1023.0) * REF_VOLTAGE;
+  z = (rawZ / 1023.0) * REF_VOLTAGE;
+}
+
+void ADXL335_7semi::readG(float &x, float &y, float &z) {
+  float voltX, voltY, voltZ;
+  readVoltage(voltX, voltY, voltZ);
+
+  x = (voltX - ZERO_VOLTAGE) / SENSITIVITY;
+  y = (voltY - ZERO_VOLTAGE) / SENSITIVITY;
+  z = (voltZ - ZERO_VOLTAGE) / SENSITIVITY;
+}

src/7semi_ADXL335.h

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+/*!
+ * @file 7semi_ADXL335.h
+ * @brief Arduino library for the ADXL335 3-axis analog accelerometer
+ * @details Reads analog signals from the sensor and provides raw, voltage, and g-force outputs.
+ * @author 7semi
+ * @copyright (c) 2025
+ */
+
+#ifndef _7SEMI_ADXL335_H_
+#define _7SEMI_ADXL335_H_
+
+#include "Arduino.h"
+
+// Constants for ADC conversion
+#define REF_VOLTAGE    5       // Reference voltage in volts
+#define ZERO_VOLTAGE   1.75     // Voltage at 0g (typically 1.6V for ADXL335)
+#define SENSITIVITY    0.33    // Sensitivity in V/g (typically 330mV/g)
+
+/*!
+ * @class ADXL335_7semi
+ * @brief Class to interface with the ADXL335 sensor
+ */
+class ADXL335_7semi {
+public:
+  ADXL335_7semi(uint8_t x_pin = A0, uint8_t y_pin = A1, uint8_t z_pin = A2);
+  void begin();
+  void readRaw(int &x, int &y, int &z);
+  void readVoltage(float &x, float &y, float &z);
+  void readG(float &x, float &y, float &z);
+
+private:
+  uint8_t x_pin, y_pin, z_pin;
+};
+
+#endif  // _7SEMI_ADXL335_H_