Virtual IoT With Proteus and Blynk : Servo Motor Speed Monitor

One of the worthy powers of the new version of Proteus is the ability to save portion of your circuit to be reused in other projects. This is know as project clips

1. Import Arduino 328 (UNO) from project clip.
2. I have already spared your effort and created a project clip of DC motor , frequency counter, XOR circuit and terminal connection with Arduino. You can find it under the name "Servo Motor.pdsclip". Use import project clip to bring it to your schematic.
3. Another time saving clip snippet is "Arduino COMPIM.pdsclip" for direct connection of COMPIM with Arduino.

Attachments

• Servo Motor.pdsclip
  Download
• Arduino COMPIM.pdsclip
  Download

Use any virtual com port emulators to commit this step. I used fabulatech virtual serial port kit

• COM1 : will be selected in COMPIM component.
• COM2 : will be used later when running blynk USB-Serial script.

You can set the number of pulses/rev generated from each encoder pin. I chose the default of 24 PPR. Since xor is used, the actual encoder output will be 48 pulses per revolution.

If you look at the Arduino code, you can easily distill it into portions:

1. Reading Motor Speed from Blynk App: This is done via using Virtual Pin. V1 is used to get the PWM value (0-100), and then map it to PWM Arduino range (0-255).
2. Fetching encoder pulses via two interrupt pins. storing value in counter.
3. Using timer to calculate the actual speed (count/time)
4. Calculate actual RPM and send it to V2 vierual pin which is assigned to Blynk gauge.

Note : Gauge is heavily commented and if you can't grasp any part of it, just leave a comment and I'll happily respond on weekends.

<p>/****************************************************************************************<br> *  Code is based on Blynk USB-Serial Example
 *  Make sure you go to C:\Users\Your Username\Documents\Arduino\libraries\Blynk\scripts
 *  Press CTRL + LMouse Button and select Open Command Windows Here
 *  Then type in command windws >> blynk-ser.bat -c COM2 and click enter
 *  Enjoy the Virtual IoT !!!
 ****************************************************************************************/
#include <BlynkSimpleStream.h></p><p><blynksimplestream.h>#include <simpletimer.h> <</simpletimer.h></blynksimplestream.h>SimpleTimer.h>        //Timer to update encoder count</p><p>// Pin Assignments
int  pinMotor=10;                                   // PWM Pin for Motor Speed.
int  pinEncoder=2;                                 //  Pin to receive XORed (double resolution) encoder pulses.
volatile unsigned int counter=0;                  //   Counter to hold counted pulses.
unsigned int motorSpeedRPM=0;                    //    Calculated motor speed from encoder value.
SimpleTimer timer;                              //     Timer object for polling counter value every 1 sec.
const long udpateInterval=1000L;               //      Timer update value (1000 ms)
const float pulsesPerRevolution=24*2.0;  //       Pulses per revolution (Servo Motor-Proteus)</p><p>//Your app authentication token (can be fetched from your blynk app
char auth[] = "2273348720d2405c92584041e6914e5b";</p><p>// This function sends Arduino's up time every 1 second to Virtual Pin (2).
// In the app, Widget's reading frequency should be set to PUSH. This means
// that you define how often to send data to Blynk App.
void updateSpeedEvent()
{
  motorSpeedRPM=((counter/(udpateInterval/1000.0))*60.0)/pulsesPerRevolution; //RPM speed
  Blynk.virtualWrite(V2, motorSpeedRPM); //send RPM value to gauge
  counter=0; //reset counter;
}</p><p>void setup()
{
  //Set the Motor pin as output
  pinMode(pinMotor,OUTPUT);
  //Set Encoder pin as input
  pinMode(pinEncoder,INPUT);
   
  // Blynk will work through Serial
  Serial.begin(9600);
  Blynk.begin(auth, Serial);</p><p>  // Setup a function to be called every 1 sec.
  timer.setInterval(udpateInterval, updateSpeedEvent);</p><p>  // Interrupt for accurate counting of encoder pulses
  attachInterrupt(digitalPinToInterrupt(pinEncoder), encoderCounter, RISING);
}</p><p>// This function corresponds to changes in slider 
// Which will change motor speed via PWM
BLYNK_WRITE(V1)
{
  int motorSpeed = param.asInt(); // assigning incoming value from pin V1 to a variable
  analogWrite(pinMotor,map(motorSpeed,0,100,0,255)); //Map motor slider (0-100)==>(0-255)
}</p><p>void loop()
{
  // All the magic is here
  Blynk.run();
  timer.run(); // Initiates SimpleTimer
}</p><p>// Interrupt Service Routine (ISR)
void encoderCounter()
{
    counter+=1; //a pulse received
}</p>

Attachments

• Blynk_MOTOR_SPEED.ino
  Download

Now you are ready to carry the normal Blynk connection like any peroject. I used local server on my PC but you can do the same using Blynk cloud server. Project files are included.

How about building a PID position controller for that servo motor? this is my upcoming video. So, stay tuned!

Attachments

• Motor Speed Monitor.rar
  Download