RadioLink-Joystick-To-Servos

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RadioLink-Joystick-To-Servos


UNDER CONSTRUCTION - July 2014: (Some updates October 2015) TO BE TESTED BETTER
If you try this version, please send problems, feedback, suggestions to terry@yourduino.com

- WHAT IT DOES:

  • Reads Joystick Analog Values on A0, A1 and transmits them over an nRF24L01 Radio Link, using the Radiohead library.</span>
  • Receives Joystick position values from an nRF24L01 Radio Link, positions X and Y Servos (Usually on a Pan-Tilt platform). May point a small laser.</span>
- LIBRARIES NEEDED: Software Servo: get the ZIP file here:
[/file/view/SoftwareServo.zip/562659119/SoftwareServo.zip SoftwareServo.zip]
[/file/view/SoftwareServo.zip/562659119/SoftwareServo.zip SoftwareServo.zip]
  • [/file/detail/SoftwareServo.zip Details]
  • [/file/view/SoftwareServo.zip/562659119/SoftwareServo.zip Download]
  • 7 KB

</span>
- RF24 Library Download HERE
- To Install libraries see: How-To HERE
Uses nRF24L01 Radios like these.

The TRANSMIT Software Sketch:</span>

(Copy and paste into a blank Arduino IDE page)</span>
/* YourDuinoStarter Example: TRANSMIT nRF24L01 Joystick data to Pan Tilt Over Radio. QUESTIONS? terry@yourduino.com - WHAT IT DOES: Reads Joystick Analog Values on A0, A1 and transmits them over a nRF24L01 Radio Link, using the Radiohead library. - TODO! Send the Joystick push-down click to turn Laser on and off - SEE the comments after "//" on each line below - CONNECTIONS: nRF24L01 Modules See: https://arduinoinfo.mywikis.net/wiki/Nrf24L01-2.4GHz-HowTo 1 - GND 2 - VCC 3.3V !!! NOT 5V 3 - CE to Arduino pin 8 4 - CSN to Arduino pin 10 5 - SCK to Arduino pin 13 6 - MOSI to Arduino pin 11 7 - MISO to Arduino pin 12 8 - UNUSED - Analog Joystick or two 10K potentiometers: GND to Arduino GND VCC to Arduino +5V X Pot to Arduino A5 Y Pot to Arduino A4 Click Button to pin 4 -V2.00 7/12/14 by Noah King Based on examples at http://www.airspayce.com/mikem/arduino/RadioHead/index.html */ /*-----( Import needed libraries )-----*/ // SEE https://arduinoinfo.mywikis.net/wiki/Arduino-Libraries  !! // NEED the RadioHead Library installed! // http://www.airspayce.com/mikem/arduino/RadioHead/RadioHead-1.23.zip #include <RHReliableDatagram.h> #include <RH_NRF24.h> #include <SPI.h> /*-----( Declare Constants and Pin Numbers )-----*/ #define JoyStick_X_PIN A5 //Pin Numbers #define JoyStick_Y_PIN A4 #define ClickPIN 4 #define CLIENT_ADDRESS 1 // For Radio Link #define SERVER_ADDRESS 2 // Create an instance of the radio driver RH_NRF24 RadioDriver; // Create an instance of a manager object to manage message delivery and receipt, using the driver declared above RHReliableDatagram RadioManager(RadioDriver, CLIENT_ADDRESS);// sets the driver to NRF24 and the client adress to 1 /*-----( Declare Variables )-----*/ uint8_t joystick[2]; // 2 element array of unsigned 8-bit type, holding Joystick readings // Predefine the message buffer here: Don't put this on the stack: uint8_t buf[RH_NRF24_MAX_MESSAGE_LEN]; // Actually: 28 bytes (32 minus 4 byte header) void setup() /****** SETUP: RUNS ONCE ******/ { // begin serial to display on Serial Monitor. Set Serial Monitor to 115200 // See https://arduinoinfo.mywikis.net/wiki/YourDuino-Serial-Monitor Serial.begin(115200); // NOTE: pinMode for Radio pins handled by RadioDriver if (!RadioManager.init()) // Defaults after init are 2.402 GHz (channel 2), 2Mbps, 0dBm Serial.println("init failed"); pinMode(ClickPIN, INPUT); //Not really needed: pins default to INPUT } void loop() /****** LOOP: RUNS CONSTANTLY ******/ { //Read the joystick values, scale them to 8-bit type and store them in the joystick[] array. Serial.println("Reading joystick values "); // Take the value of Joystick voltages which are 0 to 1023 (10 bit), and convert them to 0 to 255 (8 bit) joystick[0] = map(analogRead(JoyStick_X_PIN), 0, 1023, 0, 255); joystick[1] = map(analogRead(JoyStick_Y_PIN), 0, 1023, 0, 255); //Display the joystick values in the serial monitor. Serial.print("x:"); Serial.print(joystick[0]); Serial.print("y:"); Serial.println(joystick[1]); Serial.println("Sending Joystick data to nrf24_reliable_datagram_server"); //Send a message containing Joystick data to manager_server if (RadioManager.sendtoWait(joystick, sizeof(joystick), SERVER_ADDRESS)) { // Now wait for a reply from the server uint8_t len = sizeof(buf); uint8_t from; if (RadioManager.recvfromAckTimeout(buf, &len, 2000, &from)) { Serial.print("got reply from : 0x"); Serial.print(from, HEX); Serial.print(": "); Serial.println((char*)buf); } else { Serial.println("No reply, is nrf24_reliable_datagram_server running?"); } } else Serial.println("sendtoWait failed"); delay(500); // Wait a bit before next transmission }

</span>

The RECEIVE Software Sketch:

(Copy and paste into a blank Arduino IDE page)
/* YourDuinoStarter Example:RECEIVE nRF24L01 Joystick data to control Pan Tilt Servos Over Radio. QUESTIONS? terry@yourduino.com -WHAT IT DOES: -Receives Joystick Analog Values over a nRF24L01 Radio Link, using the Radiohead library. - Sends Joystick position to 2 servos, usually X,Y to pan-tilt arrangement - TODO! Send the Joystick push-down click to turn Laser on and off - SEE the comments after "//" on each line below - CONNECTIONS: nRF24L01 Modules See: https://arduinoinfo.mywikis.net/wiki/Nrf24L01-2.4GHz-HowTo 1 - GND 2 - VCC 3.3V !!! NOT 5V 3 - CE to Arduino pin 8 4 - CSN to Arduino pin 10 5 - SCK to Arduino pin 13 6 - MOSI to Arduino pin 11 7 - MISO to Arduino pin 12 8 - UNUSED -V2.00 7/12/14 by Noah King Based on examples at http://www.airspayce.com/mikem/arduino/RadioHead/index.html */ /*-----( Import needed libraries )-----*/ // SEE https://arduinoinfo.mywikis.net/wiki/Arduino-Libraries  !! // NEED the SoftwareServo library installed // http://playground.arduino.cc/uploads/ComponentLib/SoftwareServo.zip #include <SoftwareServo.h> // Regular Servo library creates timer conflict! // NEED the RadioHead Library installed! // http://www.airspayce.com/mikem/arduino/RadioHead/RadioHead-1.23.zip #include <RHReliableDatagram.h> #include <RH_NRF24.h> #include <SPI.h> /*-----( Declare Constants and Pin Numbers )-----*/ #define CLIENT_ADDRESS 1 #define SERVER_ADDRESS 2 #define ServoHorizontalPIN 3 //Pin Numbers #define ServoVerticalPIN 5 #define LaserPIN 6 #define ServoMIN_H 0 // Don't go to very end of servo travel #define ServoMAX_H 160 // which may not be all the way from 0 to 180. #define ServoMIN_V 0 // Don't go to very end of servo travel #define ServoMAX_V 140 // which may not be all the way from 0 to 180. /*-----( Declare objects )-----*/ SoftwareServo HorizontalServo; SoftwareServo VerticalServo; // create servo objects to control servos // Create an instance of the radio driver RH_NRF24 RadioDriver; // Create an instance of a manager object to manage message delivery and receipt, using the driver declared above RHReliableDatagram RadioManager(RadioDriver, SERVER_ADDRESS); /*-----( Declare Variables )-----*/ int HorizontalJoystickReceived; // Variable to store received Joystick values int HorizontalServoPosition; // variable to store the servo position int VerticalJoystickReceived; // Variable to store received Joystick values int VerticalServoPosition; // variable to store the servo position uint8_t ReturnMessage[] = "JoyStick Data Received"; // 28 MAX // Predefine the message buffer here: Don't put this on the stack: uint8_t buf[RH_NRF24_MAX_MESSAGE_LEN]; //--------------------------------( SETUP Runs ONCE )----------------------------------------------------- void setup() { pinMode(LaserPIN, OUTPUT); digitalWrite(LaserPIN, HIGH); // turn on Laser /*-----( Set up servos )-----*/ HorizontalServo.attach(ServoHorizontalPIN); // attaches the servo to the servo object VerticalServo.attach(ServoVerticalPIN); // attaches the servo to the servo object // begin serial to display on Serial Monitor. Set Serial Monitor to 115200 // See https://arduinoinfo.mywikis.net/wiki/YourDuino-Serial-Monitor Serial.begin(115200); if (!RadioManager.init()) // Initialize radio. If NOT "1" received, it failed. Serial.println("init failed"); // Defaults after init are 2.402 GHz (channel 2), 2Mbps, 0dBm } // END Setup //--------------------------------( LOOP runs continuously )----------------------------------------------------- void loop() { if (RadioManager.available()) { // Wait for a message addressed to us from the client uint8_t len = sizeof(buf); uint8_t from; if (RadioManager.recvfromAck(buf, &len, &from)) //Serial Print the values of joystick { Serial.print("got request from : 0x"); Serial.print(from, HEX); Serial.print(": X = "); Serial.println(buf[0]); Serial.print(" Y = "); Serial.println(buf[1]); // Send a reply back to the originator client, check for error if (!RadioManager.sendtoWait(ReturnMessage, sizeof(ReturnMessage), from)) Serial.println("sendtoWait failed"); }// end 'IF Received data Available }// end 'IF RadioManager Available { SoftwareServo::refresh();//refreshes servo to keep them updating HorizontalJoystickReceived = buf[1]; // Get the values received VerticalJoystickReceived = buf[0]; // scale it to use it with the servo (value between MIN and MAX) HorizontalServoPosition = map(HorizontalJoystickReceived, 0, 255, ServoMIN_H , ServoMAX_H); VerticalServoPosition = map(VerticalJoystickReceived, 0, 255, ServoMIN_V , ServoMAX_V); Serial.print("HorizontalServoPosition : "); Serial.print(HorizontalServoPosition); Serial.print(" VerticalServoPosition : "); Serial.println(VerticalServoPosition); // tell servos to go to position HorizontalServo.write(HorizontalServoPosition); VerticalServo.write(VerticalServoPosition); delay(25); // wait for the servo to reach the position }
}// END Main LOOP