{"id":2943,"date":"2023-04-19T06:07:41","date_gmt":"2023-04-19T06:07:41","guid":{"rendered":"https:\/\/embedwiz.com\/?p=2943"},"modified":"2023-04-19T13:45:17","modified_gmt":"2023-04-19T13:45:17","slug":"nrf24l01-arduino-projects","status":"publish","type":"post","link":"https:\/\/embedwiz.com\/nrf24l01-arduino-projects\/","title":{"rendered":"nrf24l01 Arduino Projects: 3main Arduino nrf24l01 Projects"},"content":{"rendered":"\n<p>Whenever you hear of <strong>nrf24l01 Arduino projects<\/strong>, think of a setup that allows wireless communication between two microcontrollers.&nbsp;<\/p>\n\n\n\n<p>In our article today, we intend to cover the operation of the nrf24l01 module and provide examples of different ways to interface with Arduino.&nbsp;<\/p>\n\n\n\n<p>It is a worthwhile project to try out, and we hope you\u2019ll clearly understand its working principle at the end of this guide. <\/p>\n\n\n\n<p>Further, as we&#8217;ll highlight, you should be able to set up the module in three different formations.&nbsp;<\/p>\n\n\n<h2 class=\"simpletoc-title\">Table of Contents<\/h2>\n<ul class=\"simpletoc-list\">\n<li><a href=\"#why-interface-nrf24l01-with-arduino\">Why Interface nRF24L01 with Arduino?<\/a>\n\n<\/li>\n<li><a href=\"#characteristics-of-the-nrf24l01-transceiver-module\">Characteristics of the nRF24L01 Transceiver Module<\/a>\n\n<\/li>\n<li><a href=\"#how-the-nrf24l01-module-works\">How the nRF24L01 Module Works<\/a>\n\n\n<ul><li>\n<a href=\"#nrf24l01-module-pinout\">nRF24L01 Module Pinout<\/a>\n\n<\/li>\n<\/ul>\n<li><a href=\"#nrf24l01-module-variations\">nRF24L01 Module Variations<\/a>\n\n<\/li>\n<li><a href=\"#example-1-interfacing-nrf24l01-with-arduino\">Example 1: Interfacing nRF24L01 with Arduino<\/a>\n\n\n<ul><li>\n<a href=\"#components-required\">Components Required<\/a>\n\n<\/li>\n<li><a href=\"#connection-setup\">Connection Setup<\/a>\n\n<\/li>\n<li><a href=\"#spi-pins-on-different-arduino-boards\">SPI Pins on Different Arduino Boards<\/a>\n\n<\/li>\n<li><a href=\"#loading-the-code-to-the-arduino-boards\">Loading the Code to the Arduino Boards<\/a>\n\n<\/li>\n<li><a href=\"#code-description\">Code Description<\/a>\n\n<\/li>\n<li><a href=\"#check-out-the-code\">Check out the code:<\/a>\n\n<\/li>\n<li><a href=\"#troubleshooting-common-circuit-issues\">Troubleshooting Common Circuit Issues<\/a>\n\n\n<ul><li>\n<a href=\"#fixing-power-supply-noise\">Fixing power supply noise<\/a>\n\n<\/li>\n<li><a href=\"#fixing-the-insufficient-power-problem\">Fixing the Insufficient power problem<\/a>\n\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<li><a href=\"#example-2-bidirectional-wireless-communication-between-two-arduino-boards\">Example 2: Bi-directional wireless communication between two Arduino boards.<\/a>\n\n\n<ul><li>\n<a href=\"#nrf24l01-arduino-transmitter-code\">nRF24L01 Arduino Transmitter Code<\/a>\n\n<\/li>\n<li><a href=\"#nrf24l01-arduino-receiver-code\">nRF24L01 Arduino Receiver Code<\/a>\n\n<\/li>\n<li><a href=\"#code-explanation\">Code Explanation<\/a>\n\n<\/li>\n<\/ul>\n<li><a href=\"#example-3-sending-multiple-variables-in-a-single-package\">Example 3 \u2013 Sending multiple variables in a single package<\/a>\n\n\n<ul><li>\n<a href=\"#transmitter-code\">Transmitter code<\/a>\n\n<\/li>\n<li><a href=\"#receiver-code\">Receiver Code<\/a>\n\n<\/li>\n<\/ul>\n<li><a href=\"#applications-of-nrf24l01-modules\">Applications of NRF24L01 Modules<\/a>\n\n\n<ul><li>\n<a href=\"#summary\">Summary<\/a>\n<\/li>\n<\/ul>\n<\/li><\/ul>\n\n<h2 class=\"wp-block-heading\" id=\"why-interface-nrf24l01-with-arduino\">Why Interface nRF24L01 with Arduino?<\/h2>\n\n\n<p>Our cardinal aim is to illustrate how to initiate wireless SPI communication between two Arduino boards.<\/p>\n\n\n\n<p> The <a href=\"https:\/\/www.ourpcb.com\/nrf24l01.html\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">nRF24L01 module<\/a>, in this case, is the component that facilitates this communication.&nbsp;<\/p>\n\n\n\n<p>On the other hand, the Arduino is a simple microcontroller allowing you to input a range of functionalities into your project. <\/p>\n\n\n\n<p>Therefore, depending on your desired outcomes, you can control it from your Arduino. <\/p>\n\n\n\n<p>It all depends on the <a href=\"https:\/\/embedwiz.com\/how-to-upload-code-to-arduino\/\" target=\"_blank\" rel=\"noreferrer noopener\">codes that you load onto the Arduino<\/a>.<\/p>\n\n\n\n<p>Interfacing the Arduino to the module is imperative in facilitating communication in projects where wires are impractical.&nbsp;&nbsp;<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"characteristics-of-the-nrf24l01-transceiver-module\">Characteristics of the nRF24L01 Transceiver Module<\/h2>\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"665\" src=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/1-29.jpg\" alt=\"\" class=\"wp-image-2948\" srcset=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/1-29.jpg 1000w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/1-29-300x200.jpg 300w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/1-29-768x511.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><em>The receiver or transmitter module NRF24L01 with antenna\u00a0<\/em><\/p>\n\n\n\n<ol>\n<li>It operates on the 2.4 GHz band and has baud rates between 250 kbps and 2 Mbps.&nbsp;<\/li>\n\n\n\n<li>The communication range of the module is extensive, especially at low <a href=\"https:\/\/en.wikipedia.org\/wiki\/Baud\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">baud rates<\/a> and open spaces. It can communicate with a device at a distance of 100 meters.&nbsp;<\/li>\n\n\n\n<li>It features an adjustable radio frequency power output, and the module allows you to choose between channels in 1MHz portions.&nbsp;<\/li>\n<\/ol>\n\n\n\n<p>The table below further gives the specifications of this module.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Feature&nbsp;<\/strong><\/td><td><strong>nRF24L01 Module Specification<\/strong><\/td><\/tr><tr><td>Frequency range<\/td><td>2.4 to 2.5GHz ISM band<\/td><\/tr><tr><td>Maximum output power<\/td><td>0 dBm<\/td><\/tr><tr><td>Data Rates<\/td><td>250Kbps \/ 1Mbps \/ 2Mbps<\/td><\/tr><tr><td>Maximum operating current<\/td><td>12.3mA<\/td><\/tr><tr><td>Logic inputs<\/td><td>5V tolerant<\/td><\/tr><tr><td>Communication Range<\/td><td>Up to 100m in open space<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<h2 class=\"wp-block-heading\" id=\"how-the-nrf24l01-module-works\">How the nRF24L01 Module Works<\/h2>\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"665\" height=\"1000\" src=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/2-31.jpg\" alt=\"An NRF24L01 module.\u00a0\" class=\"wp-image-2947\" srcset=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/2-31.jpg 665w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/2-31-200x300.jpg 200w\" sizes=\"(max-width: 665px) 100vw, 665px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><em>An NRF24L01 module.&nbsp;<\/em><\/p>\n\n\n\n<p>It is primarily a communication module with 125 channels, each with several addresses. <\/p>\n\n\n\n<p>Therefore, each respective channel can simultaneously link with six other modules.&nbsp;<\/p>\n\n\n\n<p>This makes it one of the most effective communication modules. In addition, the modules are frugal in power consumption. <\/p>\n\n\n\n<p>On average, each will use 12mA during significantly low communication.\u00a0<\/p>\n\n\n\n<p>Earlier, we indicated that the module has an operating voltage between 1.9V and 3.6V. <\/p>\n\n\n\n<p>Nonetheless, it can connect with the 5V Arduino logic without needing a logic-level converter.&nbsp;<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"nrf24l01-module-pinout\"><strong>nRF24L01 Module Pinout<\/strong><\/h3>\n\n\n<p>The three main <a href=\"https:\/\/en.wikipedia.org\/wiki\/Serial_Peripheral_Interface\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">SPI <\/a>pins on the module include <a href=\"https:\/\/en.wikipedia.org\/wiki\/Master\/slave_(technology)\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">MOSI<\/a>, MISO, and SCK. You need to connect these pins to the Arduino SPI ports during interfacing. <\/p>\n\n\n\n<p>The other pins include the CE and CSN terminals you should link to your Arduino\u2019s digital pins.&nbsp;<\/p>\n\n\n\n<p>They are imperative in controlling the module, primarily changing its condition between the standby and active modes.&nbsp;<\/p>\n\n\n\n<p>Finally, the module features an Interrupt pin which you don&#8217;t have to connect to anywhere during use.\u00a0<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"nrf24l01-module-variations\">nRF24L01 Module Variations<\/h2>\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"665\" src=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/3-29.jpg\" alt=\"\" class=\"wp-image-2946\" srcset=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/3-29.jpg 1000w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/3-29-300x200.jpg 300w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/3-29-768x511.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><em>An nRF24L01 with a duck antenna.&nbsp;<\/em><\/p>\n\n\n\n<p>Below are the three main types of the nRF24L01 module.&nbsp;<\/p>\n\n\n\n<ol>\n<li>Module with <strong>onboard antenna<\/strong>&#8211; It is small and compact but has a limited transmission range. The maximum range with the antenna for this module is 100 meters.&nbsp;<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\">\n<li>Module with an <strong>SMA connector<\/strong>&#8211; This has an improved transmission range thanks to the connector feature, which enables you to plug a duck antenna into it.&nbsp;<\/li>\n<\/ol>\n\n\n\n<ol start=\"3\">\n<li>Lastly, we have a variation of the type above. This module features an <strong>FX2401C chip<\/strong> to complement the duck antenna.&nbsp;<\/li>\n<\/ol>\n\n\n\n<p>The chip delivers additional features, such as a power amplifier and a Low-Noise Amplifier, to boost the signal. <\/p>\n\n\n\n<p>Hence, the ultimate transmission range of this module is the highest of the three and can reach up to a kilometer.&nbsp;<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"example-1-interfacing-nrf24l01-with-arduino\">Example 1: Interfacing nRF24L01 with Arduino<\/h2>\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"667\" src=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/4-24.jpg\" alt=\"\" class=\"wp-image-2945\" srcset=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/4-24.jpg 1000w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/4-24-300x200.jpg 300w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/4-24-768x512.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><em>An Arduino board in a robotics project.<\/em>&nbsp;<\/p>\n\n\n\n<p>We\u2019ll highlight the three main examples of how you can interface nRF24L01 with Arduino.&nbsp;<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"components-required\"><strong>Components Required<\/strong><\/h3>\n\n\n<ul>\n<li>Two Arduino Uno boards, Arduino Nano or Arduino Mega<\/li>\n\n\n\n<li>Two NRF24L01 modules&nbsp;<\/li>\n\n\n\n<li>A hookup wire<\/li>\n\n\n\n<li>Breadboard<\/li>\n\n\n\n<li>Arduino IDE<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"connection-setup\"><strong>Connection Setup<\/strong><\/h3>\n\n<h3 class=\"wp-block-heading\" id=\"spi-pins-on-different-arduino-boards\"><strong>SPI Pins on Different Arduino Boards<\/strong><\/h3>\n\n\n<p>On the parts of components above, we mentioned that you could use various types of boards. <\/p>\n\n\n\n<p>But noteworthy, there are different types of SPI pins for every Arduino board.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Arduino Board<\/strong><\/td><td><strong>SS<\/strong><\/td><td><strong>MOSI<\/strong><\/td><td><strong>MISO<\/strong><\/td><td><strong>SCK<\/strong><\/td><\/tr><tr><td>Arduino UNO<\/td><td>10&nbsp;<\/td><td>11<\/td><td>12<\/td><td>13<\/td><\/tr><tr><td>Arduino Nano<\/td><td>10<\/td><td>11<\/td><td>12<\/td><td>13<\/td><\/tr><tr><td>Arduino Mega<\/td><td>53<\/td><td>51<\/td><td>50<\/td><td>52<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<h3 class=\"wp-block-heading\" id=\"loading-the-code-to-the-arduino-boards\"><strong>Loading the Code to the Arduino Boards<\/strong><\/h3>\n\n\n<p>Once you have made the connection, you must load the code to the Arduino IDE. <\/p>\n\n\n\n<p>Primary, you will need to load the <a href=\"https:\/\/github.com\/nRF24\/RF24\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">RF24 library<\/a> to your Arduino IDE as, in most cases, it is unavailable from the Arduino library.&nbsp;<\/p>\n\n\n\n<p>Nonetheless, you may still find it on your IDE, so before loading it afresh, check out by entering the following prompt on your library: \u2018rf24.\u2019 If the code is present, install it. <\/p>\n\n\n\n<p>Next, here are the primary codes you\u2019ll need to upload on the respective IDEs:<\/p>\n\n\n\n<p><strong>Arduino 1 (Transmitter Code)<\/strong>&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh6.googleusercontent.com\/90DIH26u9Z292KnyxqD9mmgXMZGd_dIWqKCLWJ3_u7Jn4FHDtjgb55wSzSSOJpwZpTnOUToJ2nDbBnZud94tSuMlPuxoWGG4pbaAa66BiQwOF6BTop9dNLzepR3YHcuE94ndpNUwHXVTjmhsD8iUYA\" alt=\"\"\/><\/figure>\n\n\n\n<p><strong>Arduino 2 (Receiver Code)<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh3.googleusercontent.com\/fmbnE5v2t-q8qZ1mMoZKs7HqIQZxX7vZrvMgFIGyOvfwwrpyeN8LFQWqtv-0u6lgEgfAKg-UWlqFqeL267YlK7F59CkN3SS9jRpe6cGgEL1bcXws811LFaRRirho4dcbeaMzoApzb5_aDbfSYCkjuQ\" alt=\"\"\/><\/figure>\n\n\n<h3 class=\"wp-block-heading\" id=\"code-description\"><strong>Code Description<\/strong><\/h3>\n\n\n<p>First, you need to create an RF24 object for the RF24 library you created above by defining the SPI pins. In this case, the CSN and CE pins.\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh6.googleusercontent.com\/MglAbj4LXuVyhdP5_X8Zz1kncSxL6-uR9L0SH-WJ7V84QA27ASzwp25R-sWh3bFJ0lEyt_TRdOkeEStSEC5GTy57ojGd-cmIUta7QIGovX7FBGUZLqVOEClxGPC5YSFlTIS4_re9x3h3d0c8gxS30Q\" alt=\"\"\/><\/figure>\n\n\n\n<p>Now the other functionality we\u2019ll include is a byte array or the address to facilitate the communication of our nRF24L01 modules.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh5.googleusercontent.com\/h6Vyl91AvfJVd52TemcEdtbA1Op0AvG5ke4WIKOKqjTUNYC2VK_ZN3dUSF7TbiuqtHZct-DlT1LKRdc_2yqqIJhKwa9fEEBLvTRJnTSSdF_Dd8Vn03Bp-DpD-UYO-8s9pGTbjw3oXet0AocoKIigGQ\" alt=\"\"\/><\/figure>\n\n\n\n<p>Our code also allows you to switch the receivers communicating with your transmitter. <\/p>\n\n\n\n<p>All you need to do is tinker with the above 5-letter string in the code. <\/p>\n\n\n\n<p>Nonetheless, in our case, we\u2019re just interested in the included receiver. Hence we\u2019ll use the same code for both modules.&nbsp;<\/p>\n\n\n\n<p>Next, update this information on the receiver code and have the radio.setPALevel() function for the power amplification functionality. <\/p>\n\n\n\n<p>You can set the amplification to a limited state as primarily your modules are very close together. <\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"check-out-the-code\">Check out the code:<\/h3>\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh3.googleusercontent.com\/ZZ_snYqU2xn3j9lVHw00WmqzPVeOdf_tZn3-CNBEzcASQItfwTGoGLgQ47MNCsw_8hGLqcUkEAYkwAaQ25_84052LPO227pFlRUdypRFwf7xI7WjT6zc7Kj30SxlUD1jm4VOBxxmSWtq3i_CwrIaQw\" alt=\"\"\/><\/figure>\n\n\n\n<p><strong>Note:<\/strong> If you set up your power amplification at a \u2018HIGH,\u2019 you must include bypass capacitors in your circuit. <\/p>\n\n\n\n<p>The ideal placement should be between your module&#8217;s 3.3V port and GND. <\/p>\n\n\n\n<p>It will significantly improve the stability of your circuit\u2019s voltage.&nbsp;<\/p>\n\n\n\n<p>Our next part is to introduce a radio.stop Listening() function will aid in defining the respective roles of the two modules when we use it in tandem with the radio.startListening() fuction.\u00a0<\/p>\n\n\n\n<p>Hence, we\u2019ll include the Start Listening Function at the receiver and the Stop Listening Function at the transmitter.&nbsp;<\/p>\n\n\n\n<p>Next, on our code, we need to write our first message on the void loop part, as illustrated below. <\/p>\n\n\n\n<p>Note that this code is on the transmitter end.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh5.googleusercontent.com\/0mFnZWQblHiTk6yUhA1gJA52Y9GZrpjlQ4HGwH2BEU6uTC8mCEs-uH7gqamdqCXNzhGRSSOyNrserrOsMxgKsLbE60p4SawPhDPkyO1DGzp1KqV-0bg-bjqCoNXZMw-JgpsesOFFqzvnmFNWujae3A\" alt=\"\"\/><\/figure>\n\n\n\n<p>Similarly, we need to enable the receiver to read the message we have sent from the transmitter via the code below.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh5.googleusercontent.com\/6-tEWvnUyPXIhq-oXIy3aPq_vDlIn2k9GbsLEsYV8I6kyW_COXP9s0r2uFfE2qK9AFaRck0TYGsNRM5Vvo3TWI3lfeuHVYcOOQeXP4kOOj8LJ7n5z6ZONE9DYrVUe9YUiKlM6K8GyhbeSGQNK6AYOw\" alt=\"\"\/><\/figure>\n\n\n\n<p>Finally, run the serial monitor, and you\u2019ll receive the Hello message printout on your display.<\/p>\n\n\n\n<p>Now we have created a code that makes communication between two Arduino boards.&nbsp;<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"troubleshooting-common-circuit-issues\"><strong>Troubleshooting Common Circuit Issues<\/strong><\/h3>\n\n\n<p>In this setup, there are two main issues we\u2019re likely to encounter, and here, we\u2019ll highlight their solutions.&nbsp;<\/p>\n\n\n<h4 class=\"wp-block-heading\" id=\"fixing-power-supply-noise\"><strong>Fixing power supply noise<\/strong><\/h4>\n\n\n<p>Our project is an <a href=\"https:\/\/en.wikipedia.org\/wiki\/RF_module\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">RF<\/a> circuit meaning that its likely to have frequent power supply noise interruptions. <\/p>\n\n\n\n<p>But you can solve this issue by including a 10uF capacitor on your circuit\u2019s power supply line.&nbsp;<\/p>\n\n\n<h4 class=\"wp-block-heading\" id=\"fixing-the-insufficient-power-problem\"><strong>Fixing the Insufficient power problem<\/strong><\/h4>\n\n\n<p>Another issue you\u2019ll most likely encounter is that your NRF24L01 module may not receive sufficient power from the Arduino board power supply. <\/p>\n\n\n\n<p>Hence, powering it with a battery or any other viable external power source would be best.\u00a0<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"example-2-bidirectional-wireless-communication-between-two-arduino-boards\">Example 2: Bi-directional wireless communication between two Arduino boards.<\/h2>\n\n\n<p>In this example, we\u2019ll have a setup similar to the above, but in this case, we\u2019ll introduce a bi-directional wireless communication functionality. <\/p>\n\n\n\n<p>This means that unlike above, your receiver module can also wirelessly send a signal to the transmitter.\u00a0<\/p>\n\n\n\n<p>We\u2019ll also introduce other components, including a joystick module,<a href=\"https:\/\/embedwiz.com\/arduino-servo-motor-projects\/\"> servo motor<\/a>, push button, and an LED, as illustrated in the schematic below.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh5.googleusercontent.com\/tOxnolLKtajgH_wdWtmxO5NpZUalPoPu-qkiiG7e_z8xoeKcMlhZhqIV78evcKMQgjo1i2hPWdL_kVMA4_d6qbfNhjuNZjHvG9V4vNHxw6w0jJpwLxXBtNKezxZJS9XZSyD6YjeFGRA0w4QZtiRlfA\" alt=\"\"\/><\/figure>\n\n\n<h3 class=\"wp-block-heading\" id=\"nrf24l01-arduino-transmitter-code\"><strong>nRF24L01 Arduino Transmitter Code<\/strong><\/h3>\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh6.googleusercontent.com\/79uZqi6zfutistxQ5-qyMkFgqGKY8MCO2Mlp4WOOzgMAvbUMfG5UetRdIxe607PAMBwCpKmctZqNZJpmPmCa5wd6Q8dq0Tsy0bJs6Fb9p8HLUZCHmPRhLAKiu5iYx8R4KXYobbwm8jgeJPLnnHgCdA\" alt=\"\"\/><\/figure>\n\n\n<h3 class=\"wp-block-heading\" id=\"nrf24l01-arduino-receiver-code\"><strong>nRF24L01 Arduino Receiver Code<\/strong><\/h3>\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh5.googleusercontent.com\/5A1ZtdVa1iziBchXw1zhHC5l56CaPyFqv1EotvXD7myzm_7p2dNxPEfdWbr_eKWZucyY9SWCKXg6DnS9KIVhJsdTfkMCLF1mOGX4LJB-FS39UteX9kptGMZuwDo-TcswmeXGq4N3SfO2XRCUq316YQ\" alt=\"\"\/><\/figure>\n\n\n<h3 class=\"wp-block-heading\" id=\"code-explanation\"><strong>Code Explanation<\/strong><\/h3>\n\n\n<p>Unlike in the first example above, in this case, we need to formulate different addresses to facilitate bidirectional communication. <\/p>\n\n\n\n<p>Hence, here\u2019s what our first part of the code will look like:&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh6.googleusercontent.com\/qY7M18D5XCW2XBxajLdI7WODKttm8wwlTh114dF_6Ttn0-kqiiEz91PSREQ5rRsEiHruTYkFQbKO5pujWvTZyAAOccK3Jh9ILLepL_VwG9mmT0DGlXfgQpzFEjP-PQ-BLu43FZNcGJqbG5sWDeziLw\" alt=\"\"\/><\/figure>\n\n\n\n<p>The rule of thumb when defining the addresses is that you must ensure your primary Arduino\u2019s writing address is similar to your secondary Arduino\u2019s reading address. <\/p>\n\n\n\n<p>Similarly, your secondary Arduino\u2019s writing address must be the primary Arduino\u2019s reading address.&nbsp;<\/p>\n\n\n\n<p>Next, we need to define which of the two Arduinos is the transmitter and the receiver. <\/p>\n\n\n\n<p>In this case, the first Arduino is the transmitter; hence we need to define it in the loop function via the radio.stopListening() function.&nbsp;<\/p>\n\n\n\n<p>At this juncture, also remember to define your Joystick\u2019s value and, lastly, define the radio.write() function to include your primary Arduino as the data sender.\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh3.googleusercontent.com\/1ITFKqvO1DlowHpJTu_Y0ADwZf8tRbI2sN9vnsqCrlyX2e7hjBVwdzhiWUQWpphZLmIOln5iGBv2ZDTfvle0arC1osmUCNx7TWFCdny98UMB7y9R5SNWvDuXE0DbDhwl4G09owqODOTZrRjYkwemHA\" alt=\"\"\/><\/figure>\n\n\n\n<p>Similarly, you must set up your secondary Arduino as the receiver. <\/p>\n\n\n\n<p>You\u2019ll also note that a part includes the \u201cangleV\u201d variable in the code below. <\/p>\n\n\n\n<p>It defines the angle of your servo motor\u2019s rotation.\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh3.googleusercontent.com\/k311In_OJKQpDZ3Wym75t7iAPOqXusovFGmwoJ6Xh3hhGR9y4vjhjCgpV9pSsCUIPjLFT_jFaTvndy-OiQo-MYjEq_TXYlRxA0F-d-OWe4fRiEN-aUKUBCRPeWhPvTtftyzo8UNWpImlC7ywJOGKRQ\" alt=\"\"\/><\/figure>\n\n\n\n<p>Primarily your circuit is now ready, and you can initiate wireless communication between the two Arduino modules.&nbsp;<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"example-3-sending-multiple-variables-in-a-single-package\">Example 3 \u2013 Sending multiple variables in a single package<\/h2>\n\n\n<p>Lastly, our modules can send numerous variables using the above setup. <\/p>\n\n\n\n<p>So, below are the transmitter and receiver codes.\u00a0<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"transmitter-code\"><strong>Transmitter code<\/strong><\/h3>\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh5.googleusercontent.com\/KjZ3dAofWipCR1aY09MENrD9DnHwTghINUUTnnTqSRaLCCyIgpMgiVI2vsUR8rN8PseCWmoEZY1hUDi4jB3GAgiQEY4RTJoKcaZ5IJTKBMTlGNNuubjs8hwrqydhoIArWnTJ1U1axKRLdO9YtEC2SA\" alt=\"\"\/><\/figure>\n\n\n<h3 class=\"wp-block-heading\" id=\"receiver-code\"><strong>Receiver Code<\/strong><\/h3>\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh5.googleusercontent.com\/8NrUsZRNxnSQiE8J_F7Oc0nS8P2BmGvGNPEEhgZnmPLlJkLMg9a4Y1LmGElLeDpm1Vcu6dU42hLBlwkAcdStEI616GQXYcwF1wwdniROFLvf79ViVulRMqXuceKIikPkyH6GJVwsm5RbCnS2lHyxIw\" alt=\"\"\/><\/figure>\n\n\n<h2 class=\"wp-block-heading\" id=\"applications-of-nrf24l01-modules\">Applications of NRF24L01 Modules<\/h2>\n\n\n<ul>\n<li>RF remote control units.<\/li>\n\n\n\n<li>Telemetry<\/li>\n\n\n\n<li>Alarm systems<\/li>\n\n\n\n<li>Wireless mouse<\/li>\n\n\n\n<li>Home automation systems<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"summary\"><strong>Summary<\/strong><\/h3>\n\n\n<p>With the NRF24L01 module, you can make as many Arduino wireless communication projects as possible.\u00a0<\/p>\n\n\n\n<p>Above, we have evaluated the key processes to undertake and the respective variations to the project you can make with the module. <\/p>\n\n\n\n<p>All the best; try out your favorite NRF24L01 project, and always contact us for more.\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Whenever you hear of nrf24l01 Arduino projects, think of a setup that allows wireless communication between two microcontrollers.&nbsp; In our article today, we intend to cover the operation of the nrf24l01 module and provide examples &#8230; <a title=\"nrf24l01 Arduino Projects: 3main Arduino nrf24l01 Projects\" class=\"read-more\" href=\"https:\/\/embedwiz.com\/nrf24l01-arduino-projects\/\" aria-label=\"More on nrf24l01 Arduino Projects: 3main Arduino nrf24l01 Projects\">Read more<\/a><\/p>\n","protected":false},"author":9,"featured_media":2944,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>nrf24l01 Arduino Projects: 3main Arduino nrf24l01 Projects<\/title>\n<meta name=\"description\" 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