Tag Archives: Joystick

In this Video Lesson we show how to calibrate a joystick to report Angular Position. We do this using MicroPython on a Raspberry Pi Pico W. For your convenience, the code is included below.

# ====================================================================
# DISCLAIMER:
# This code is provided as-is for educational and experimental 
# purposes only. The author makes no representations or warranties of 
# any kind concerning the safety, suitability, or accuracy of this 
# code. Use at your own risk. The author assumes no liability for any 
# damages, system failures, security breaches, or network issues 
# resulting from the use or implementation of this script.
# ====================================================================

import machine
import time
import math
hPin=27
vPin=26
hJoy= machine.ADC(hPin)
vJoy= machine.ADC(vPin)
while True:
    hVal=hJoy.read_u16()
    vVal=vJoy.read_u16()
    
    hCal=int(-.00306*hVal+100.766)
    vCal=int(.00306*vVal-100.766)
    
    deg=math.atan2(vCal,hCal)*360/2/math.pi
    if hCal==0:
        hCal=1
    if deg<0:
        deg=deg+360
    
    mag=math.sqrt(hCal**2+vCal**2)
    if mag<=4:
        hCal=0
        vCal=0
    
    print(hCal,vCal,deg)
    time.sleep_ms(200)

# ====================================================================

# DISCLAIMER:

# This code is provided as-is for educational and experimental

# purposes only. The author makes no representations or warranties of

# any kind concerning the safety, suitability, or accuracy of this

# code. Use at your own risk. The author assumes no liability for any

# damages, system failures, security breaches, or network issues

# resulting from the use or implementation of this script.

# ====================================================================

import machine

import time

import math

hPin=27

vPin=26

hJoy= machine.ADC(hPin)

vJoy= machine.ADC(vPin)

while True:

hVal=hJoy.read_u16()

vVal=vJoy.read_u16()

hCal=int(-.00306*hVal+100.766)

vCal=int(.00306*vVal-100.766)

deg=math.atan2(vCal,hCal)*360/2/math.pi

if hCal==0:

hCal=1

if deg<0:

deg=deg+360

mag=math.sqrt(hCal**2+vCal**2)

if mag<=4:

hCal=0

vCal=0

print(hCal,vCal,deg)

time.sleep_ms(200)

Arduino, Tutorial

Arduino Tutorial 39: Using a Joystick to Control DC Motor Speed and Direction

December 3, 2019 admin

DC Motor JoyStick — This is a simple example of how to control speed and direction of a DC motor with a joystick.

Lesson 37 and 38 showed some preliminary concepts in controlling a DC motor using an arduino and the L293D motor controller. In the video above we show how to control the speed and direction of a simple DC motor using a joystick. In the neutral position, the motor is stationary. Then the speed smoothly increases as you move the joystick forward, until you reach maximum speed. Similarly, in pulling the joystick back from the neutral position, the motor gradually increases speed in the reverse direction. The diagram below shows the basic motor control schematic we are working from.

Connection Diagram for a DC Motor Controller using the L293 Control Chip

In the circuit diagram above, we also add a wire to connect the arduino ground to the power supply ground. It is always good to have all components connected to a common ground rail. Of course, you also need to add the joystick controller as shown in the video.

This is the code we used in this

int speedPin=5;
int dir1=4;
int dir2=3;
int mSpeed;
int jPin=A1;
int jVal;

void setup() {
  // put your setup code here, to run once:
pinMode(speedPin,OUTPUT);
pinMode(dir1,OUTPUT);
pinMode(dir2,OUTPUT);
pinMode(jPin,INPUT);
Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:
jVal=analogRead(jPin);

Serial.println(jVal);
if (jVal<512){
digitalWrite(dir1,LOW);
digitalWrite(dir2,HIGH);
mSpeed=-255./512.*jVal+255.;
analogWrite(speedPin,mSpeed);
}
if(jVal>=512){
digitalWrite(dir1,HIGH);
digitalWrite(dir2,LOW);
mSpeed=(255./512.)*jVal-255.;
analogWrite(speedPin,mSpeed);
}
}

int speedPin=5;

int dir1=4;

int dir2=3;

int mSpeed;

int jPin=A1;

int jVal;

void setup() {

// put your setup code here, to run once:

pinMode(speedPin,OUTPUT);

pinMode(dir1,OUTPUT);

pinMode(dir2,OUTPUT);

pinMode(jPin,INPUT);

Serial.begin(9600);

}

void loop() {

// put your main code here, to run repeatedly:

jVal=analogRead(jPin);

Serial.println(jVal);

if (jVal<512){

digitalWrite(dir1,LOW);

digitalWrite(dir2,HIGH);

mSpeed=-255./512.*jVal+255.;

analogWrite(speedPin,mSpeed);

}

if(jVal>=512){

digitalWrite(dir1,HIGH);

digitalWrite(dir2,LOW);

mSpeed=(255./512.)*jVal-255.;

analogWrite(speedPin,mSpeed);

}

An official Arduino Uno R3 is available HERE. In this new series of lessons, I will be using the sensor and other components found in this KIT.

Arduino, Tutorial

Arduino Tutorial 33: Understanding How to Control Servos with a Joystick

October 22, 2019 admin

In this lesson we show you how to precisely control the position of two servos using a joystick. We derive the math equations which will allow you to get smooth and precise control of the servo. We also add a buzzer to the project to create an audible alarm when the button the joystick is pressed.

If you want to follow along at home, an official Arduino Uno R3 is available HERE. In this new series of lessons, I will be using the sensor and other components found in this KIT.

Typically, the servos in electronics kits are not the best ones, but are suitable to learn with. If you want a more stable and better quality servo, this is the one I user in more of my projects: HiTEC

Below is the code we developed in this project.

#include <Servo.h>
Servo Xservo;
Servo Yservo;

int Xpin=A0;
int Ypin=A1;
int Spin=2;
int XSpin=9;
int YSpin=10;
int buzzPin=7;
int WVx;
int WVy;
int Xval;
int Yval;
int Sval;
int dt=200;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(Xpin,INPUT);
pinMode(Ypin,INPUT);
pinMode(Spin,INPUT);
pinMode(XSpin,OUTPUT);
pinMode(YSpin,OUTPUT);
pinMode(buzzPin,OUTPUT);

Xservo.attach(XSpin);
Yservo.attach(YSpin);

digitalWrite(Spin,HIGH);
}

void loop() {
 Xval=analogRead(Xpin);
 WVx=(180./1023.)*Xval;
 Yval=analogRead(Ypin);
 WVy=(180./1023.)*Yval;
 Sval=digitalRead(Spin);


 Xservo.write(WVx);
 Yservo.write(WVy);

 if (Sval==0){
  digitalWrite(buzzPin, HIGH);
 }
 else {
  digitalWrite(buzzPin, LOW);
 }


 
 delay(dt);
 Serial.print("X Value = ");
 Serial.print(Xval);
 Serial.print(" Y Value = ");
 Serial.print(Yval);
 Serial.print(" Switch State is ");
 Serial.println(Sval);
}

#include <Servo.h>

Servo Xservo;

Servo Yservo;

int Xpin=A0;

int Ypin=A1;

int Spin=2;

int XSpin=9;

int YSpin=10;

int buzzPin=7;

int WVx;

int WVy;

int Xval;

int Yval;

int Sval;

int dt=200;

void setup() {

// put your setup code here, to run once:

Serial.begin(9600);

pinMode(Xpin,INPUT);

pinMode(Ypin,INPUT);

pinMode(Spin,INPUT);

pinMode(XSpin,OUTPUT);

pinMode(YSpin,OUTPUT);

pinMode(buzzPin,OUTPUT);

Xservo.attach(XSpin);

Yservo.attach(YSpin);

digitalWrite(Spin,HIGH);

}

void loop() {

Xval=analogRead(Xpin);

WVx=(180./1023.)*Xval;

Yval=analogRead(Ypin);

WVy=(180./1023.)*Yval;

Sval=digitalRead(Spin);

Xservo.write(WVx);

Yservo.write(WVy);

if (Sval==0){

digitalWrite(buzzPin, HIGH);

}

else {

digitalWrite(buzzPin, LOW);

}

delay(dt);

Serial.print("X Value = ");

Serial.print(Xval);

Serial.print(" Y Value = ");

Serial.print(Yval);

Serial.print(" Switch State is ");

Serial.println(Sval);

}

Arduino, Tutorial

Arduino Tutorial 32: Understanding and Using Joysticks in a Project

October 15, 2019 admin

In this lesson we will explain how to hook up a Joystick. The easiest way to think of a joystick is to think of it as two independent potentiometer. Moving the joystick left and right changes one potentiometer, and moving the joystick up and down changes the other potentiometer. Also, pressing the knob on the joystick will activate a simple on/off switch. In this video we show you how to hook the joystick up, and then show you code that will allow you to read from the potentiometers and the switch.

If you want to follow along at home, an official Arduino Uno R3 is available HERE. In this new series of lessons, I will be using the sensor and other components found in this KIT.

Typically, the servos in electronics kits are not the best ones, but are suitable to learn with. Heads up that in Lesson 33 we will be using a joystick to control two servos. If you want to get ready for that lesson, go ahead and order your HiTEC Servos.

This is the code that we developed in the video above.

int Xpin=A0;
int Ypin=A1;
int Spin=2;
int Xval;
int Yval;
int Sval;
int dt=200;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(Xpin,INPUT);
pinMode(Ypin,INPUT);
pinMode(Spin,INPUT);
digitalWrite(Spin,HIGH);
}

void loop() {
 Xval=analogRead(Xpin);
 Yval=analogRead(Ypin);
 Sval=digitalRead(Spin);
 delay(dt);
 Serial.print("X Value = ");
 Serial.print(Xval);
 Serial.print(" Y Value = ");
 Serial.print(Yval);
 Serial.print(" Switch State is ");
 Serial.println(Sval);
}

int Xpin=A0;

int Ypin=A1;

int Spin=2;

int Xval;

int Yval;

int Sval;

int dt=200;

void setup() {

// put your setup code here, to run once:

Serial.begin(9600);

pinMode(Xpin,INPUT);

pinMode(Ypin,INPUT);

pinMode(Spin,INPUT);

digitalWrite(Spin,HIGH);

}

void loop() {

Xval=analogRead(Xpin);

Yval=analogRead(Ypin);

Sval=digitalRead(Spin);

delay(dt);

Serial.print("X Value = ");

Serial.print(Xval);

Serial.print(" Y Value = ");

Serial.print(Yval);

Serial.print(" Switch State is ");

Serial.println(Sval);

}

Technology Tutorials

Tag Archives: Joystick

Calibrating Joystick to Show Positional Angle in MicroPython on the Raspberry Pi Pico W

Arduino Tutorial 39: Using a Joystick to Control DC Motor Speed and Direction

Arduino Tutorial 33: Understanding How to Control Servos with a Joystick

Arduino Tutorial 32: Understanding and Using Joysticks in a Project

Making The World a Better Place One High Tech Project at a Time. Enjoy!