10/30/2020

Simple and Cheap Radio Control Making for RC Models. DIY RC

How to make a low cost 4 channel remote control for RC model aircraft, drone, cars and boats.
Construction of remote controls with proportional controls, which cost about 13-14 USD. It can be used for all kinds of model vehicle control such as model aircraft, drone, car, boat, tank.

Necessary materials:

2 x Arduino Nano
1 x NRF24L01 + PA Wireless Module
1 x NRF24L01 Wireless Module
2 x Arduino joystick
2 x 100uF Capacitor (16V or above)
1 x 13 * 6 cm PCB Board
1 x 5 * 3.5 cm PCB Board

Arduino Nano: https://www.banggood.com/custlink/vvGKUFyfT9
Arduino Nano & USB Cable: https://www.banggood.com/custlink/vDDGkGyA0y
Arduino Joystick: https://www.banggood.com/custlink/333mMmdABV
NRF24L01 Wireless Modul: https://www.banggood.com/custlink/KGvvMmEbnR
NRF24L01 + PA Wireless Modul: https://www.banggood.com/custlink/33GGqGhQbZ
PCB Boards:
https://www.banggood.com/custlink/v33vUGYsUd
https://www.banggood.com/custlink/3vGmz3yNqC
100uF Capacitor: https://www.banggood.com/custlink/DKDvMvyQUe
Headers:
https://www.banggood.com/custlink/m3vGqKdnfN
https://www.banggood.com/custlink/vG33zGYUmd


Other materials:

SG90 Servos: https://www.banggood.com/custlink/Kv3DS6stKo
20A ESC: https://www.banggood.com/custlink/mvvDggsH4C
7.4V 450Mah 2S LiPo: https://www.banggood.com/custlink/KKKGU3EqE3
DC 180 Motor 39000 RPM: https://amzn.to/35rD8Ar or bit.ly/2L62JqC

Transmitter Circuit & Receiver Circuit

Transmitter Code

// 4 Channel Transmitter | 4 Kanal Verici

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>

const uint64_t pipeOut = 0xE9E8F0F0E1LL;   //IMPORTANT: The same as in the receiver 0xE9E8F0F0E1LL | Bu adres alıcı ile aynı olmalı
RF24 radio(7, 8); // select CE,CSN pin | CE ve CSN pinlerin seçimi

struct Signal {
byte throttle;
byte pitch;
byte roll;
byte yaw;
};

Signal data;

void ResetData() 
{
data.throttle = 127; // Motor Stop (254/2=127)| Motor Kapalı (Signal lost position | sinyal kesildiğindeki pozisyon)
data.pitch = 127; // Center | Merkez (Signal lost position | sinyal kesildiğindeki pozisyon)
data.roll = 127; // Center | merkez (Signal lost position | sinyal kesildiğindeki pozisyon)
data.yaw = 127; // Center | merkez (Signal lost position | sinyal kesildiğindeki pozisyon)
}

void setup()
{
//Start everything up

radio.begin();
radio.openWritingPipe(pipeOut);
radio.stopListening(); //start the radio comunication for Transmitter | Verici olarak sinyal iletişimi başlatılıyor
ResetData();
}

// Joystick center and its borders | Joystick merkez ve sınırları

int mapJoystickValues(int val, int lower, int middle, int upper, bool reverse)
{
val = constrain(val, lower, upper);
if ( val < middle )
val = map(val, lower, middle, 0, 128);
else
val = map(val, middle, upper, 128, 255);
return ( reverse ? 255 - val : val );
}

void loop()
{
// Control Stick Calibration | Kumanda Kol Kalibrasyonları
// Setting may be required for the correct values of the control levers. | Kolların doğru değerleri için ayar gerekebilir.

data.throttle = mapJoystickValues( analogRead(A0), 524, 524, 1015, true );
data.roll = mapJoystickValues( analogRead(A1), 12, 524, 1020, true );      // "true" or "false" for servo direction | "true" veya "false" servo yönünü belirler
data.pitch = mapJoystickValues( analogRead(A2), 12, 524, 1020, true );     // "true" or "false" for servo direction | "true" veya "false" servo yönünü belirler
data.yaw = mapJoystickValues( analogRead(A3), 12, 524, 1020, true );       // "true" or "false" for servo direction | "true" veya "false" servo yönünü belirler

radio.write(&data, sizeof(Signal));
}

 

Receiver Code

//  4 Channel Receiver | 4 Kanal Alıcı
//  PWM output on pins D2, D3, D4, D5 (Çıkış pinleri)

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#include <Servo.h>

int ch_width_1 = 0;
int ch_width_2 = 0;
int ch_width_3 = 0;
int ch_width_4 = 0;

Servo ch1;
Servo ch2;
Servo ch3;
Servo ch4;

struct Signal {
byte throttle;      
byte pitch;
byte roll;
byte yaw;
};

Signal data;

const uint64_t pipeIn = 0xE9E8F0F0E1LL;
RF24 radio(7, 8); 

void ResetData()
{
// Define the inicial value of each data input. | Veri girişlerinin başlangıç değerleri
// The middle position for Potenciometers. (254/2=127) | Potansiyometreler için orta konum
data.throttle = 127; // Motor Stop | Motor Kapalı
data.pitch = 127;  // Center | Merkez
data.roll = 127;   // Center | Merkez
data.yaw = 127;   // Center | Merkez
}

void setup()
{
  //Set the pins for each PWM signal | Her bir PWM sinyal için pinler belirleniyor.
  ch1.attach(2);
  ch2.attach(3);
  ch3.attach(4);
  ch4.attach(5);

  //Configure the NRF24 module
  ResetData();
  radio.begin();
  radio.openReadingPipe(1,pipeIn);
  
  radio.startListening(); //start the radio comunication for receiver | Alıcı olarak sinyal iletişimi başlatılıyor
}

unsigned long lastRecvTime = 0;

void recvData()
{
while ( radio.available() ) {
radio.read(&data, sizeof(Signal));
lastRecvTime = millis();   // receive the data | data alınıyor
}
}

void loop()
{
recvData();
unsigned long now = millis();
if ( now - lastRecvTime > 1000 ) {
ResetData(); // Signal lost.. Reset data | Sinyal kayıpsa data resetleniyor
}

ch_width_1 = map(data.throttle, 0, 255, 1000, 2000);     // pin D2 (PWM signal)
ch_width_2 = map(data.pitch,    0, 255, 1000, 2000);     // pin D3 (PWM signal)
ch_width_3 = map(data.roll,     0, 255, 1000, 2000);     // pin D4 (PWM signal)
ch_width_4 = map(data.yaw,      0, 255, 1000, 2000);     // pin D5 (PWM signal)

// Write the PWM signal | PWM sinyaller çıkışlara gönderiliyor
ch1.writeMicroseconds(ch_width_1);
ch2.writeMicroseconds(ch_width_2);
ch3.writeMicroseconds(ch_width_3);
ch4.writeMicroseconds(ch_width_4);
}

Required library link for NRF24L01 : https://github.com/maniacbug/RF24