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Arduino Nrf24L01 Examples4/27/2021
Basically, the pins in the lower right corners of the diagrams above must be connected to the corresponding Arduino pins.VCC must be 3.3V and CE and CSN from the NRF24L01 connect to pins 7 and 8, respectively, on the Arduino.
Soldering a 0.1 uf capacitor between the VCC and ground pins of the NRF24L01 is a good idea. This example is a frivolous game in which the PRX generates a random number and the nodes try to guess the number. While I think Codebender is fantastic, Please copy the code out of Codebender because the RF24.h library in Codebender appears to be an older version. The define WHICHNODE statement needs to be altered for each node. When running, I suggest powering the PRX first and starting the serial monitor for it. ENJOY And please do comment on any way in which this Instructable might be improved. Meaning, if you build your project with one you can just unplug it and use another without need to make any changes to the system. Arduino Nrf24L01 Examples Driver DRV8825 StepperSensor Multiple DS18B20 Sensors BME280 Pressure Sensor BMP180 Pressure Sensor RC522 RFID Module Sound Sensor Soil Moisture Sensor Water Level Sensor Rain Sensor Force Sensor(FSR) Flex Sensor Displays 162 Character LCD 7 Segment Display Nokia 5110 Graphic LCD OLED Graphic Display Motors Servo Motor 28BYJ-48 Stepper Motor A4988 Stepper Driver DRV8825 Stepper Driver L293D Motor Driver Shield L298N with DC Motor L298N with Stepper Motor L293D IC with DC Motor L293D IC with Stepper Motor Modules Rotary Encoder One Channel Relay Module Two Channel Relay Module 74HC595 Shift Register 2-Axis Joystick DS3231 RTC Module DS1307 RTC Module 44 Membrane Keypad Micro SD Card Module How nRF24L01 Wireless Module Works Interface with Arduino Having two or more Arduino boards be able to communicate with each other wirelessly over a distance opens lots of possibilities like remotely monitoring sensor data, controlling robots, home automation and the list goes on. And when it comes down to having inexpensive yet reliable 2-way RF solutions, no one does a better job than nRF24L01 transceiver module from Nordic Semiconductor. And best of all, these modules are super tiny, allowing you to incorporate a wireless interface into almost any project. Hardware Overview Radio Frequency The nRF24L01 transceiver module is designed to operate in 2.4 GHz worldwide ISM frequency band and uses GFSK modulation for data transmission. The data transfer rate can be one of 250kbps, 1Mbps and 2Mbps. What is 2.4 GHz ISM band 2.4 GHz band is one of the Industrial, Scientific, and Medical (ISM) bands reserved internationally for the use of unlicensed low-powered devices. Examples are Cordless phones, Bluetooth devices, near field communication (NFC) devices, and wireless computer networks (WiFi) all use the ISM frequencies. Power consumption The operating voltage of the module is from 1.9 to 3.6V, but the good news is that the logic pins are 5-volt tolerant, so we can easily connect it to an Arduino or any 5V logic microcontroller without using any logic level converter. The module supports programmable output power viz. Bm, -6 dBm, -12 dBm or -18 dBm and consumes unbelievably around 12 mA during transmission at 0 dBm, which is even lower than a single LED. And best of all, it consumes 26 A in standby mode and 900 nA at power down mode. Thats why theyre the go-to wireless device for low-power applications. SPI Interface The nRF24L01 transceiver module communicates over a 4-pin Serial Peripheral Interface ( SPI ) with a maximum data rate of 10Mbps. All the parameters such as frequency channel (125 selectable channels), output power (0 dBm, -6 dBm, -12 dBm or -18 dBm), and data rate (250kbps, 1Mbps, or 2Mbps) can be configured through SPI interface. Unlike the I2C bus the number of slaves on the SPI bus is limited, on the Arduino Uno you can use a maximum of two SPI slaves i.e. RF24L01 transceiver modules. Here are complete specifications: Frequency Range 2.4 GHz ISM Band Maximum Air Data Rate 2 Mbs Modulation Format GFSK Max. Output Power 0 dBm Operating Supply Voltage 1.9 V to 3.6 V Max. Operating Current 13.5mA Min. Current(Standby Mode) 26A Logic Inputs 5V Tolerant Communication Range 800 m (line of sight) nRF24L01 module Vs nRF24L01 PALNA module There are a variety of modules available based upon the nRF24L01 chip. However, the smaller antenna also means a lower transmission range. With this version, youll be able to communicate over a distance of 100 meters. Your range indoors, especially through walls, will be slightly weakened. The real difference is that it comes with a special RFX2401C chip which integrates the PA, LNA, and transmit-receive switching circuitry. This range extender chip along with a duck-antenna helps the module achieve a significantly larger transmission range about 1000m. It merely boosts the power of the signal being transmitted from the nRF24L01 chip. The function of the LNA is to take the nRF24L01 PALNA Block Diagram extremely weak and uncertain signal from the antenna (usually on the order of microvolts or under -100 dBm) and amplify it to a more useful level (usually about 0.5 to 1V) The low-noise amplifier (LNA) of the receive path and the power amplifier (PA) of the transmit path connect to the antenna via a duplexer, which separates the two signals and prevents the relatively powerful PA output from overloading the sensitive LNA input. For more information check out this article on digikey.com Except this difference, both modules are drop-in compatible.
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