netNF Electric Longboard Part 4

The Rideable Prototype

After some experimentation I gave up on the radio control(RC) servo library for controlling my Longboard’s Electronic Speed Control(ESC).

My new longboard controller uses the following parts

  • Netduino 3 Wifi
  • Generic wireless wii nuchuk
  • generic Arduino protoshield

I reused the initial protoshield and only had to shift the PWM output to the ESC from pin 8 to pin 7.

FEZ Panda III Protoshield for longboard with RC Servo for testing
Protoshield for longboard RC Servo test
public class Program
{
   private const double PulseFrequency = 50.0;
   private const double PulseDurationMinimum = 0.05; // 1000uSec
   private const double PulseDurationMaximum = 0.1; // 2000uSec
   private const double WiiNunchukYMinimum = 0.0;
   private const double WiiNunchukYMaximum = 255.0;
   private const int ThrottleUpdatePeriod = 100;

   public static void Main()
   {
      Debug.WriteLine("devMobile.Longboard starting");
      Debug.WriteLine($"I2C:{I2cDevice.GetDeviceSelector()}");
      Debug.WriteLine($"PWM:{PwmController.GetDeviceSelector()}");

      try
      {
         Debug.WriteLine("LED Starting");
         GpioPin led = GpioController.GetDefault().OpenPin(PinNumber('A', 10));
         led.SetDriveMode(GpioPinDriveMode.Output);
         led.Write(GpioPinValue.Low);

         Debug.WriteLine("LED Starting");
         WiiNunchuk nunchuk = new WiiNunchuk("I2C1");

         Debug.WriteLine("ESC Starting");
         PwmController pwm = PwmController.FromId("TIM5");
         PwmPin pwmPin = pwm.OpenPin(PinNumber('A', 1));
         pwmPin.Controller.SetDesiredFrequency(PulseFrequency);
         pwmPin.Start();

         Debug.WriteLine("Thread.Sleep Starting");
         Thread.Sleep(2000);

         Debug.WriteLine("Mainloop Starting");
         while (true)
         {
            nunchuk.Read();

            double duration = Map(nunchuk.AnalogStickY, WiiNunchukYMinimum, WiiNunchukYMaximum, PulseDurationMinimum, PulseDurationMaximum);
            Debug.WriteLine($"Value:{nunchuk.AnalogStickY} Duration:{duration:F3}");

            pwmPin.SetActiveDutyCyclePercentage(duration);
            led.Toggle();
            Thread.Sleep(ThrottleUpdatePeriod);
         }
      }
      catch (Exception ex)
      {
         Debug.WriteLine(ex.Message);
      }
   }

   private static int PinNumber(char port, byte pin)
   {
      if (port < 'A' || port > 'J')
         throw new ArgumentException();

      return ((port - 'A') * 16) + pin;
   }

   private static double Map(double x, double inputMinimum, double inputMaximum, double outputMinimum, double outputMaximum)
   {
      return (x - inputMinimum) * (outputMaximum - outputMinimum) / (inputMaximum - inputMinimum) + outputMinimum;
   }
}

The nanoFramework code polls the wii nunchuk for the joystick position every 100mSec and then updates the PWM duty cycle.

By convention the ESSC PWM frequency is 50Hz (a pulse ever 20mSec) and the duration of the pulse is 1000uSec(minimum throttle) to 2000uSec(maximum throttle), note the change of units.

After converting to the same units there is a pulse every 20mSec and its duration is 1mSec too 2mSec. Then converting the durations to the active duty cycle percentage (for the PWM SetActiveDutyCyclePercentage) the duration of the pulse is 5% to 10%.

I need to re-calibrate the ESC for these durations and ensure that reverse is disabled. Then tinker with the brake (braking percent & percent drag brake) and acceleration(initial acceleration low, medium, high, very high) configurations of my ESC to make the longboard easier to ride.

Next I will look at configurable throttle maps (to make it easier for new and different weight users), then using one of the wii-nunchuk buttons for cruise control (keeping the throttle steady when riding is difficult) and how the software reacts when the connection with nunchuk fails

netNF Electric Longboard Part 3

Servo Control

The next step was to figure out how to operate a radio control(RC) servo as a proxy for an Electronic Speed Control(ESC).

My test rig uses (prices as at Aug 2020) the following parts

  • Netduino 3 Wifi
  • Grove-Base Shield V2.0 for Arduino USD4.45
  • Grove-Universal 4 Pin Bucked 20cm cable(5 PCs Pack) USD2.90
  • Grove-Servo USD5.90
  • Grove-Rotary Angle Sensor USD2.90

My servo test harness

public class Program
{
   public static void Main()
   {
      Debug.WriteLine("devMobile.Longboard.ServoTest starting");

      try
      {
         AdcController adc = AdcController.GetDefault();
         AdcChannel adcChannel = adc.OpenChannel(0);

         ServoMotor servo = new ServoMotor("TIM5", ServoMotor.ServoType.Positional, PinNumber('A', 0));
         servo.ConfigurePulseParameters(0.6, 2.3);

         while (true)
         {
            double value = adcChannel.ReadRatio();
            double position = Map(value, 0.0, 1.0, 0.0, 180);

            Debug.WriteLine($"Value: {value:F2} Position: {position:F1}");

            servo.Set(position);

            Thread.Sleep(100);
         }
      }
      catch (Exception ex)
      {
         Debug.WriteLine(ex.Message);
      }
   }

   private static int PinNumber(char port, byte pin)
   {
      if (port < 'A' || port > 'J')
         throw new ArgumentException();

      return ((port - 'A') * 16) + pin;
   }

   private static double Map(double x, double inputMinimum, double inputMaximum, double outputMinimum, double outputMaximum)
   {
      return (x - inputMinimum) * (outputMaximum - outputMinimum) / (inputMaximum - inputMinimum) + outputMinimum;
   }
}

The nanoFramework code polls for the rotary angle sensor for its position every 100mSec and then updates the servo.

The servo code was based on sample code provided by GHI Electronics for their TinyCLR which I had to adapt to work with the nanoFramework.

The next test rig will be getting the Netduino 3 software working my Longboard ESC and Lithium Polymer(LiPo) batteries.

netNF Electric Longboard Part 2

Analog Inputs & Pulse Width Modulation

The next step was to figure out how to configure a Pulse Width Modulation (PWM) output and an Analog Input so I could adjust the duty cycle and control the brightness of a Light Emitting Diode(LED).

Netduino 3 ADC & PWN test rig

My test rig uses (prices as at Aug 2020) the following parts

  • Netduino 3 Wifi
  • Grove-Base Shield V2.0 for Arduino USD4.45
  • Grove-Universal 4 Pin Bucked 5cm cable(5 PCs Pack) USD1.90
  • Grove-Universal 4 Pin Bucked 20cm cable(5 PCs Pack) USD2.90
  • Grove-LED Pack USD2.90
  • Grove-Rotary Angle Sensor USD2.90

My analog input test harness

 public class Program
   {
      public static void Main()
      {
         Debug.WriteLine("devMobile.Longboard.AdcTest starting");
         Debug.WriteLine(AdcController.GetDeviceSelector());

         try
         {
            AdcController adc = AdcController.GetDefault();
            AdcChannel adcChannel = adc.OpenChannel(0);

            while (true)
            {
               double value = adcChannel.ReadRatio();

               Debug.WriteLine($"Value: {value:F2}");

               Thread.Sleep(100);
            }
         }
         catch (Exception ex)
         {
            Debug.WriteLine(ex.Message);
         }
      }
   }

The nanoFramework code polls for the rotary angle sensor for its position value every 100mSec.

The setup to use for the Analog to Digital Convertor(ADC) port was determined by looking at the board.h and target_windows_devices_adc_config.cpp file.

//
// Copyright (c) 2018 The nanoFramework project contributors
// See LICENSE file in the project root for full license information.
//

#include <win_dev_adc_native_target.h>

const NF_PAL_ADC_PORT_PIN_CHANNEL AdcPortPinConfig[] = {
    
    // ADC1
    {1, GPIOC, 0, ADC_CHANNEL_IN10},
    {1, GPIOC, 1, ADC_CHANNEL_IN11},

    // ADC2
    {2, GPIOC, 2, ADC_CHANNEL_IN14},
    {2, GPIOC, 3, ADC_CHANNEL_IN15},

    // ADC3
    {3, GPIOC, 4, ADC_CHANNEL_IN12},
    {3, GPIOC, 5, ADC_CHANNEL_IN13},

    // these are the internal sources, available only at ADC1
    {1, NULL, 0, ADC_CHANNEL_SENSOR},
    {1, NULL, 0, ADC_CHANNEL_VREFINT},
    {1, NULL, 0, ADC_CHANNEL_VBAT},
};

const int AdcChannelCount = ARRAYSIZE(AdcPortPinConfig);

The call to AdcController.GetDeviceSelector() only returned one controller

The thread '<No Name>' (0x2) has exited with code 0 (0x0).
devMobile.Longboard.AdcTest starting
ADC1

After some experimentation it appears that only A0 & A1 work on a Netduino. (Aug 2020).

My PWM test harness

public class Program
{
   public static void Main()
   {
      Debug.WriteLine("devMobile.Longboard.PwmTest starting");
      Debug.WriteLine(PwmController.GetDeviceSelector());

      try
      {
         PwmController pwm = PwmController.FromId("TIM5");
         AdcController adc = AdcController.GetDefault();
         AdcChannel adcChannel = adc.OpenChannel(0);

         PwmPin pwmPin = pwm.OpenPin(PinNumber('A', 0));
         pwmPin.Controller.SetDesiredFrequency(1000);
         pwmPin.Start();

         while (true)
         {
            double value = adcChannel.ReadRatio();

            Debug.WriteLine(value.ToString("F2"));

            pwmPin.SetActiveDutyCyclePercentage(value);

            Thread.Sleep(100);
         }
      }
      catch (Exception ex)
      {
         Debug.WriteLine(ex.Message);
      }
   }

   private static int PinNumber(char port, byte pin)
   {
      if (port < 'A' || port > 'J')
         throw new ArgumentException();
      return ((port - 'A') * 16) + pin;
   }
}

I had to refer to the Netduino schematic to figure out pin mapping

With my test rig (with easy access to D0 thru D8) I found that only D2,D3,D7 and D8 work as PWM outputs.

The next test rig will be getting Servo working.