gryo-microview.ino

// Demo of MicroView (Arduino-based) from SparkFun with Parallax Gyroscope Module 3-Axis L3G4200D
// Author: Drew Fustini (@pdp7)

// LICENSE:
// This code is licensed as CC0 ("No Rights Reserved") except for example code used from:
// http://learn.parallax.com/KickStart/27911 (Creative Commons 3.0 SA license)
// http://learn.microview.io/doco/html/index.html (GPL v3)

#include <Wire.h>
#include <MicroView.h>

#define CTRL_REG1 0x20
#define CTRL_REG2 0x21
#define CTRL_REG3 0x22
#define CTRL_REG4 0x23

int Addr = 105;                 // I2C address of gyro
int x, y, z;

MicroViewWidget *widgetx, *widgety, *widgetz;

void setup() {
  Wire.begin();
  writeI2C(CTRL_REG1, 0x1F);    // Turn on all axes, disable power down
  writeI2C(CTRL_REG3, 0x08);    // Enable control ready signal
  writeI2C(CTRL_REG4, 0x80);    // Set scale (500 deg/sec)
  delay(100);                   // Wait to synchronize

  uView.begin();		// start MicroView
  uView.clear(PAGE);

  uView.print("bringahack");

  uView.setCursor(0, 15);
  uView.print("x");
  uView.setCursor(0, 28);
  uView.print("y");
  uView.setCursor(0, 40);
  uView.print("z");

  widgetx = new MicroViewSlider(10, 15, 0, 100); // draw Slider widget at x=0,y=0,min=0, max=100
  widgety = new MicroViewSlider(10, 28, 0, 100); // draw Slider widget at x=0,y=0,min=0, max=100
  widgetz = new MicroViewSlider(10, 40, 0, 100); // draw Slider widget at x=0,y=0,min=0, max=100

  delay(100);
}

void loop() {
  getGyroValues();              // Get new values
  // In following Dividing by 114 reduces noise
  // uView.print("X: "); uView.print(x / 114);
  // uView.print("Y:"); uView.print(y / 114);
  // uView.print("Z:"); uView.println(z / 114);
  widgetx->setValue(x / 114); // give a value to widget
  widgety->setValue(y / 114); // give a value to widget
  widgetz->setValue(z / 114); // give a value to widget

  uView.display(); // display current page buffer
  delay(500);                   // Short delay between reads
}

void getGyroValues () {
  byte MSB, LSB;

  MSB = readI2C(0x29);
  LSB = readI2C(0x28);
  x = ((MSB << 8) | LSB);

  MSB = readI2C(0x2B);
  LSB = readI2C(0x2A);
  y = ((MSB << 8) | LSB);

  MSB = readI2C(0x2D);
  LSB = readI2C(0x2C);
  z = ((MSB << 8) | LSB);
}

int readI2C (byte regAddr) {
  Wire.beginTransmission(Addr);
  Wire.write(regAddr);                // Register address to read
  Wire.endTransmission();             // Terminate request
  Wire.requestFrom(Addr, 1);          // Read a byte
  while (!Wire.available()) { };      // Wait for receipt
  return (Wire.read());               // Get result
}

void writeI2C (byte regAddr, byte val) {
  Wire.beginTransmission(Addr);
  Wire.write(regAddr);
  Wire.write(val);
  Wire.endTransmission();
}