The Hardware

• Netduino 2 USD33 NZD60
• Netduino 2 Plus 2 USD60 NZD108
• Grove System Starter Kit V3 USD50

Flash an LED

OutputPort led = new OutputPort(Pins.ONBOARD_LED, false);
while ( true)
{
   Led.Write(!Led.Read())
   Thread.Sleep(500)
}

Digital Input – Polled

InputPort button = new InputPort(Pins.ONBOARD_SW1, false, Port.ResistorMode.Disabled);
OutputPort led = new OutputPort(Pins.ONBOARD_LED, false);
while (true)
{
   led.Write(button.Read());
   Thread.Sleep(1000);
}

Digital Input – Interrupt

static OutputPort interuptled = new OutputPort(Pins.ONBOARD_LED, false);
InterruptPort button = new InterruptPort(Pins.ONBOARD_SW1, false, Port.ResistorMode.Disabled, Port.InterruptMode.InterruptEdgeHigh);
button.OnInterrupt += new NativeEventHandler(button_OnInterrupt);

Thread.Sleep(Timeout.Infinite);

static void button_OnInterrupt(uint data1, uint data2, DateTime time)
{
   interuptled.Write(!interuptled.Read());
}

Analog Input

AnalogInput Sensor = new AnalogInput(Cpu.AnalogChannel.ANALOG_0);
while ( true)
{
   Debug.Print( "Value " + Sensor.Read().ToString("F2"));
   Thread.Sleep(500);
}

Pulse Width Modulation Output

AnalogInput brightness = new AnalogInput(AnalogChannels.ANALOG_PIN_A0);
PWM led = new PWM(PWMChannels.PWM_PIN_D5, 1000, 0.0, false);

led.Start();
while (true)
{
   Debug.Print("Brightness " + led.DutyCycle.ToString("F2"));
   led.DutyCycle = brightness.Read();
   Thread.Sleep(500);
}
led.Stop();

Power Consumption Monitor

• Energy Monitor Shield USD 23.00
• Non-invasive current Sensor 30A USD10.80

Developing the software for the Energy Monitor Shield

• Read the buttons using an Analog input
• Calibrate the sensor for the offset voltage
• Calculate the RMS current based on the sensor outputs and AnalogInput range
• Display the power consumption on the Nokia 5110 display
• Compensate for Noise on the AnalogInput
• Upload the power consumption information to xively

Robot

• Motor Shield USD19.50 NZD25
• Sharp IR Proximity sensor NZD22
• Magician Chassis NZ30

Developing the software

• Determine the distance to objects
• Control the speed & direction of the motors using a Motor Shield Driver
• Basic obstacle avoidance
• Avoid obstacles using a state machine
• Fine tune the motor speeds using a rotary encoder
• Connect the GPS
• Upload the position information to Xively

Heart Rate Monitor

• Grove – Ear Clip Sensor USD13
• LCD Keypad Shield USD8 NZD14

Developing the software

• Read the buttons using an AnalogInput
• Count the number of button presses using an InterruptPort and a Timer
• Determine the pulse rate in BPM by counting
• Determine the average pulse rate in BPM
• Display and manage the pulse rate info on the DFRobot 16×2 Lcd Shield
• Upload the pulse rate information to xively