private void btnRead_Click(object sender, EventArgs e)
{
byte[] r = new byte[int.Parse(txtReadCount.Text)];
i2c.SlaveAddress = getAddr();
i2c.read(r);
txtRead.Text = DeviceI2C.ByteArrayToString(r);
}
private void btnRangefinder_Click(object sender, EventArgs e)
{
openPort();
byte[] w = { HCSR04_I2C_REGISTRY_STATUS };
byte[] r = new byte[3];
i2c.write(w);
Thread.Sleep(10);
i2c.read(r);
txtRangerfinderRegs.Text = DeviceI2C.ByteArrayToString(r);
int range = (((int)r[1]) << 8) + (int)r[2];
txtRangefinderDistance.Text = range.ToString();
}