This is my second instructable tutorial about the robots and micro-controllers. It is really amazing to see your robot alive and working as expected and believe me it will be more fun if you control your robot or other things wireless with fast and wide range of communication. That is why this instructable is about wireless communication.

Step 1: PARTS

For Transmitter

Arduino Nano or Uno (I’m using Arduino UNO) x1 https://amzn.to/2vTkWzd
Transceiver module NRF24L01 x1 https://amzn.to/2Q4sHeG
Dual Axis Joysticks x2. https://amzn.to/2Q4t0Gm
(or other things like push buttons, sensors etc . I’m using Joystick because I want to send data about the position of joystick).

For Receiver:

Arduino Nano or Uno (I’m using Arduino Nano). x1 https://amzn.to/2E7orqa
Transceiver module NRF24L01. x1 https://amzn.to/2Q4sHeG

Others:

Jumper wires https://amzn.to/2JBK4m8

Batteries for Arduino supply https://amzn.to/2W5cDyM and https://amzn.to/2W5cDyM

Step 2: Introduction to NRF and Connections

By the name of Transceiver it is clear that this module can communicate in both ways as a transmitter or as a receiver depends upon programming. It has 8 pins and we are going to use 7 pins. You may observe pins in attached picture.

VCC & GND for supply.

For this purpose we will use 3.3v pin of Arduino.

CE & CSN

Transmitter and receiver pins. We are going to use Arduino (Nano and Uno) Pin 9 for CE and Pin 10 for CSN.

MOSI, MISO & SCK

These are SPI pins.

It communicate with Arduino by SPI pins. Every member in Arduino family has some specific pins for SPI communication.

For Arduino UNO:

SPI pins are

Pin 11 (MOSI)

Pin 12 (MISO)

Pin 13 (SCK)

Arduino Nano SPI pins:

Pin 11 (MOSI)

Pin 12 (MISO)

Pin 13 (SCK)

Same as Arduino UNO.

Now you can make connections for both transmitter and receiver.

Note: You must have a library for NRF24L01 in your Arduino IDE software. Download it by Here.

Step 3: Introduction to Joystick and Connections.

Joystick in nothing but a simple potentiometer. The 2 axis joystick we are using in this tutorial have 5 pins as shown in picture..

Connections for joystick at transmitter end:

VCC to Arduino 5v pin.

GND to Arduino GND

VRx to Arduino Analogue pin A0

VRy to Arduino Analogue pin A1

SW to any spare digital pin of Arduino. (I'm not using this pin but you may use by a little change in code).

For second Joystick

You may use arduino 5V pin for both joysticks.

VRx to Arduino Analogue pin A2
VRy to Arduino Analogue pin A3

Using two joysticks means you have to transmit 4-6 channels.

Step 4: Working and Programming Part

After the construction of transmitter and receiver take out output pins from receiver. I'm using Arduino's digital pin 2 to digital pin 5 for my 4 channel wireless communication. You may extend it upto available digital pins. To check the working of system I attached a robotic arm having 4 servo motors at receiver end.

Arduino Nano Digital pin 2 => Channel 1 => THR

Arduino Nano Digital pin 3 => Channel 2 => YAW

Arduino Nano Digital pin 4 => Channel 3 => PITCH

Arduino Nano Digital pin 5 => Channel 4 => ROLL

Codes for transmitter and receiver are attached. Don't forget to include libraries first in your Arduino IDE software before uploading the code to Arduino.

Step 5: Upgrading

The basic purpose of this tutorial was to cover the part of wireless communication. But you have to make changing according to your purpose and project. For any question and help use the email address given in code files, must watch the video attached at top and subscribe the channel for support, Thank you.