Wireless controlling servos with potentiometer using nrf24l01

Projects General Guidance
1

Hallo , i am trying to control servo motor by potentiometer wireless using nrf24l01

if value of potentiometer get in range (0-400) servo turn left and if value if potentiometer get in range

(700-1000) servo turn right

please help . and thanks :slight_smile:

2

Here is a good tutorial on the use of the rf24 radios.

How to read a potentiometer.

The if statement reference.
The else statement reference.

3

thanks so much . i want the servo turn right if potentiometer was in range (700-100) and turn left when potentiometer in range (0-400) .

my code for rx

/***********************************************

  • LED Connections *
  • Anode -> VCC *
  • Cathode -> GND *
  • NRF 24L01 Connection *
  • VCC -> 3.3 V *
  • GND -> GND *
  • SCK -> 13 *
  • MISO -> 12 *
  • MOSI -> 11 *
  • CSN -> 7 *
  • CE -> 8 *
    ***********************************************/

//// Adding Libraries

#include <SPI.h> // to handle the communication interface with the modem
#include <nRF24L01.h> // to handle this particular modem driver
#include <RF24.h> // the library which helps us to control the radio modem
#include <Servo.h>

Servo myservo;
RF24 radio(7,8); // Creating instance 'radio' ( CE , CSN ) CE -> D7 | CSN -> D8

const byte Address[6] = " 00009 " ; // Address from which data to be received

void setup() {
// put your setup code here, to run once:
myservo.attach(3);
Serial.begin(9600); // Setting baudrate of Serial Port to 9600

radio.begin(); // Activate the modem

radio.openReadingPipe(1, Address); // Sets the address of receiver from which program will receive the data

// radio.startListening(); // Setting modem in Receiver mode
}

void loop() {
// put your main code here, to run repeatedly:

radio.startListening();

if (radio.available())
{
while (radio.available()) // Loop until receiving valid data
{

int rx_data = 0 ; // Variable to store received data

radio.read(&rx_data, sizeof(rx_data)); // Read the received data and store in ' rx_data '

Serial.print("Received Data : ");

Serial.println(rx_data); // Print received value on Serial Monitor
myservo.write (rx_data);

// analogWrite(led_pin , rx_data); // Write received value to PWM pin 3 to which LED is connected

}
}

else
{
Serial.println("Not Receiving !!!"); // If not receiving valid data print " Not Receiving !!! " on Serial Monitor
}
///// END OF LOOP //////

code tx :

/***********************************************

  • Potentiometer Connections *
  • PIN 1 -> VCC *
  • PIN 2 -> Analog input 0 i.e. A0 *
  • PIN 3 -> GND *
  • NRF 24L01 Connection *
  • VCC -> 3.3 V *
  • GND -> GND *
  • SCK -> 13 *
  • MISO -> 12 *
  • MOSI -> 11 *
  • CSN -> 7 *
  • CE -> 8 *
    ***********************************************/

//// Adding Libraries

#include <SPI.h> // to handle the communication interface with the modem
#include <nRF24L01.h> // to handle this particular modem driver
#include <RF24.h> // the library which helps us to control the radio modem

#define pot_pin A0 // Variable pin of POT is to be connected to analog pin 0 i.e. A0

RF24 radio(7,8); // Creating instance 'radio' ( CE , CSN ) CE -> D7 | CSN -> D8

const byte Address[6] = " 00009 " ; // Address to which data to be transmitted

//int data ; // Creating variable to store and send data

int value = 0 ; // Creating variable to store analog input on pin A0

void setup() {
// put your setup code here, to run once:

Serial.begin(9600);

pinMode(pot_pin,INPUT); // Setting A0 (POT pin) as input

radio.begin (); // Activate the modem

radio.openWritingPipe (Address); // Sets the address of transmitter to which program will send the data

// radio.stopListening (); // Setting modem in transmission mode

}

void loop() {
// put your main code here, to run repeatedly:

radio.stopListening (); // Setting modem in transmission mode

value = analogRead(pot_pin); // Reading analog value at pin A0 and storing in varible 'value'

int data = map( value , 0 , 1023 , 0 , 180 ); // Convering the 10 bit value to 8 bit

radio.write(&data, sizeof(data)); // Sending data over NRF 24L01

Serial.print("Transmitting Data : ");

Serial.println(data); // Printing POT value on serial monitor

}

4

Read the how to use this forum-please read sticky to see how to properly post code and some advice on how to ask a good question. Remove useless white space and format the code with the IDE autoformat tool (crtl-t or Tools, Auto Format) before posting code.

So send the raw output of the pot analog input value ( 0 to 1023) instead of the mapped value (0 to 180).
In the receiver use a series of if statements to decode the pot value (rx_data).

if(rx_data > 0 && rx_data < 399)
{
    //turn left
}
else if(rx_data > 400 && rx_data < 699)
{
     // go striaght
}
else  // anything greater than 700
{
    // turn right   
}

logic and (&&).

5

but when send signal by rf24 . i receive output from 0-255 and i can not compare this value

6

Did you make changes to your code? If so please post the new version so that we can keep up.

Read the how to use this forum-please read sticky to see how to properly post code and some advice on how to ask a good question. Remove useless white space and format the code with the IDE autoformat tool (crtl-t or Tools, Auto Format) before posting code.

7

@Warawreh

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