Arduino joystick controller


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    For this project, we are going to use an Arduino Joystick module. It is a basic use of the module just for learning purposes but there are endless applications for it, especially in the space of robotics. This Arduino joystick module is very similar to what you would find on many game controllers but if we look under the hood, all the magic happens thanks to 2 potentiometers, one for the X-Axis and another one for the Y-Axis.

    The potentiometers are actually used to control 2D movement by generating analog signals. Some modules also have a push button that can be used for special events. The Joystick module is a gadget that translates your hand movement into electrical signals, in other words, the joystick translates entirely physical movements into a digital form that can be interpreted by our controller, the Arduino in this case.

    The old fashion joystick above is nothing but two potentiometers that allow us to measure the movement of the red stick in a double dimension. The potentiometers are basically variable resistors which are used in the joystick module and act as sensors that provide a variable voltage depending on the movement of the joystick around its shafts.

    The Arduino Joystick module is just like any joystick with the advantage that it has pins made available to easily pass the signals to the microcontroller, Arduino in this case.

    We can control the X axis, Y axis and Z dimensions the button for special events using this joystick module. As explained earlier, the potentiometers are used to handle the X and Y axis while the button is just a switch. The data pins for the X-Axis and Y-Axis dimensions are analog input signals while the Z dimension pin uses a digital input button.

    That is why, X and Y ports connect to analog pins of Arduino, while the Z port connects to digital pin of the microcontroller. When you rotate the joystick arm, you are changing the resistance in the potentiometer.

    If the joystick stick is on the opposite direction of the path from the input connection terminal, then, the signal will experience maximum resistance. Changing the resistance of the potentiometer changes the current in the connected circuit. In this way, the potentiometer converts the physical position of the rod into an electrical signal and passes it to the joystick port on the controller. What is a servo motor? The other component that we will be using today is a servo motor. Servos are small and efficient motors that can be positioned very precisely with the use of a microcontroller.

    These features make them very useful for applications like toy cars, robots, and airplanes. They can also be used in industrial applications, robotics, in-line manufacturing, pharmacy, and pretty much anything you can imagine.

    The servo circuit is built into the motor unit and has a positional shaft, usually equipped with gear. The motor is controlled by an electrical signal that determines the amount of motion of the shaft.

    How To Interface Joystick Module with Arduino

    To change the direction of the motor, however, the supply it receives must be reversed. As the pulse width increases, the average voltage applied to the motor will also increase — and vice versa. This means that the DC motor speed varies with the pulse width. PMW has become a commonly used method to do just this. How it works: when the joystick is at the center position, the DC motor stops.

    When the joystick is moved up or down, the motor rotates in the same direction — either forward or in reverse. Additionally, the further away from the center the joystick is pushed in either direction , the faster the motor speed will be in that same direction.

    So, users can control the DC motor speed in this way. The joystick control method for DC motors is currently used in several different applications, including as: 1. Remote-controlled RC toys, such as planes, helicopters, boats, cars, etc. Video camera cranes 4. Robotic arms or for robotic vehicles 5. Surveillance camera controllers There are many other applications as well, where the DC motor that drives the load is controlled by a joystick. In some, only the direction of the motor is altered such as for RC toys whereas in other applications, both the direction and speed are varied such as for video camera cranes, jog controls, etc.

    The project given below demonstrates using a joystick to control the speed and direction of a DC motor. The button pin is not used here. They drive the motor through the motor driver.

    Circuit working and operation: Circuit working and operation: Initially, when the joystick is in the center or rest position, the motor is stopped. As the joystick is gradually moved up, the motor starts running at a slow speed in a clockwise direction forward. As the joystick is moved further up from the center, the motor speed increases. When the joystick is up as far as it can go, the motor attains its full speed forward.

    As the joystick moves back to the center rest position, the motor speed starts decreasing and will stop. Similarly, when the joystick is moved downward, the motor starts running in an anti-clockwise direction reverse.

    As the joystick is moved further from the center, the motor speed increases until it. When the joystick is down as far as it can go, the motor attains its full speed in reverse. When the joystick is moved fully left or right, the motor runs in either forward or reverse at full speed. It will completely stop when in the center position.

    When the joystick is moved up or down, its internal resistance the potentiometer increases or decreases. Essentially, this increases or decreases the analog output voltage for pin X. Arduino will read the analog voltage and convert it into a digital value, which ranges from 0 to , based on whether the joystick moves fully up or down.

    When the joystick is in the center position, Arduino receives a value of about Similarly, when the joystick is moved downward, the value decreases from to 0 max. When the joystick moves downward, the PWM value increases on pin D6 and the motor speed accelerates in a reverse direction. Similarly, moving the joystick to the left or right will increase or decrease the analog output on pin Y. Arduino will read the analog voltage and convert it into a digital value. When the joystick is moved to the right, the value will be more than When the joystick is moved to the left, the value will be less than The motor speed increases and decreases as the joystick is moved.

    It will also change directions depending on whether the joystick is moved up or down. Software program:.

    Single Joystick Remote Control Transmitter using NRF24L01 – Arduino Compatible

    This connector is common between both styles of nRF24L01 modules. Although the nRF24L01 is powered by a 1. This is a standard bus that is used by many microcontrollers and microcomputers including the Arduino and the Raspberry Pi.

    Each slave device needs to be selected by the master in order for it to communicate. Only one slave can communicate at any given time. This is the Ground Pin. It is usually marked by encasing the pin in a square so it can be used as a reference for identifying the other pins.

    The positive voltage. This can be anywhere from 1. It os NOT 5-volt tolerant! Chip Enable, an active-high pin. When selected the nRF24L01 will either transmit or receive, depending upon which mode it is currently in.

    Chip Select Not. Master Out Slave In. The input to the nRF24L Master In Slave Out. The output from the nRF24L The Interrupt output pin. It is also common to power the module with a 3. When selecting a power supply it should be noted that the nRF24L01 can consume a fair amount of current when transmitting at its highest power. Your power supply should be capable of providing at least mA of current.

    Noise on the power supply can also cause problems with the nRF24L It is advised to place a filter capacitor microfarads is ideal across the power supply lines as physically close to the nRF24L01 module as possible to eliminate power supply noise.

    Another way to resolve the power supply issues, and the one I suggest you employ, is to use an Adapter Module for your nRF24L I recommend you use one and I show it in all the schematics included in this article.

    How 2-Axis Joystick Works & Interface with Arduino + Processing

    It also has a 6-pin male connector for the SPI and Interrupt connections and a 2-pin connector for power input. The adapter module has its own 3. Assuming your power supply has the required current capability the adapter module will resolve all of the power supply considerations mentioned above.

    They can make the difference between success and failure with your nRF24L01 design. You could of course use another model of Arduino, if you do however you may need to change the pinouts as different Arduino models use different pins for the SPI bus. Our Robot Car project was based around an Arduino Uno, this is the project that we will be modifying to use the wireless joystick with. Arduino Libraries and Connections As with other radio modules there are a number of libraries available for the nRf24l 1.

    Using a library will really simplify creating projects with these modules. It is great for creating secure wireless communications devices. Mirf Library — Based on the Tinkerer library. RadioHead — This is a modern library with many advanced features, capable of supporting many RF modules. In the experiments we will be performing and for our wireless joystick project we will be using the RadioHead library.

    Please note that not all of the libraries listed above use the came connections to the Arduino, and that the connections differ depending upon which type of Arduino you are using. This is an advanced library which allows many methods of packet radio communications between RF modules like the nRF24L Look for the link to the ZIP file near the top of the description on the page.

    Select Add. Use the dialog box to select the ZIP file you have downloaded. The RadioHead library will be installed. Hooking up the Arduinos The RadioHead library comes with a number of sample sketches that illustrate its use.

    Here are the connections you will need to make for an Arduino Uno: Note that you will need to make two of these circuits! We will refer to one of the circuits as the Server and one as the Client. The wiring for both is identical.

    But again your best bet is to simply use the nRF24L01 Adapter Module and save yourself a lot of grief and frustration! This is still Ground of course so it goes to one of the Mega ground pins.

    Again this is still a power supply connection. See the notes above regarding which voltage to use. This is the same as the Arduino Uno, it goes to pin 8 on the Mega Connect this to output pin 53 on the Mega Connect this to output pin 52 on the Mega This goes to pin 51 on the Mega Finally this goes to pin 50 on the Mega Once you have everything hooked up you are ready to run the first sketches. Open the File menu from the top menu bar. Select Examples. A sub-menu will be displayed. Scroll down the Examples sub-menu to the section at the bottom titled Examples from Custom Libraries.

    As the joystick is gradually moved up, the motor starts running at a slow speed in a clockwise direction forward. As the joystick is moved further up from the center, the motor speed increases. When the joystick is up as far as it can go, the motor attains its full speed forward. As the joystick moves back to the center rest position, the motor speed starts decreasing and will stop.

    Using the joystick with Arduino

    Similarly, when the joystick is moved downward, the motor starts running in an anti-clockwise direction reverse. As the joystick is moved further from the center, the motor speed increases until it.

    When the joystick is down as far as it can go, the motor attains its full speed in reverse. When the joystick is moved fully left or right, the motor runs in either forward or reverse at full speed. It will completely stop when in the center position.

    How to make a DIY joystick control car with Arduino | Step by step instructions

    When the joystick is moved up or down, its internal resistance the potentiometer increases or decreases. Essentially, this increases or decreases the analog output voltage for pin X. Arduino will read the analog voltage and convert it into a digital value, which ranges from 0 tobased on whether the joystick moves fully up or down. When the joystick is in the center position, Arduino receives a value of about Similarly, when the joystick is moved downward, the value decreases from to 0 max.

    When the joystick moves downward, the PWM value increases on pin D6 and the motor speed accelerates in a reverse direction. Similarly, moving the joystick to the left or right will increase or decrease the analog output on pin Y. Arduino will read the analog voltage and convert it into a digital value. When the joystick is moved to the right, the value will be more than When the joystick is moved to the left, the value will be less than The motor speed increases and decreases as the joystick is moved.


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