Ai-Thinker nRF24L01 User manual

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Local Connectivity
nRF24L01+
Eueung Mulyana
https://eueung.github.io/012017/nrf24
CodeLabs | Attribution-ShareAlike CC BY-SA

Outline
Introduction
Getting Started - Preparation
Getting Started - Code & Play
Simple Remote Control
Gateway
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Introduction
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nRF24L01+
nRF24L01+ is a highly integrated, ultra
low power (ULP) 2Mbps RF
transceiver IC for the 2.4GHz ISM
(Industrial, Scientic and Medical)
band 2.400 - 2.4835GHz.
The Nordic nRF24L01+ integrates a complete 2.4GHz RF
transceiver, RF synthesizer, and baseband logic including the
hardware protocol accelerator (Enhanced ShockBurst)
supporting a high-speed SPI interface for the application
controller.
With peak RX/TX currents lower than 14mA, a sub uA power
down mode, advanced power management, and a 1.9 to 3.6V
supply range, the nRF24L01+ provides a true ULP solution
enabling months to years of battery life from coin cell or AA/AAA
batteries.
Ref: Nordic Semiconductor

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nRF24L01+
1. ISM Frequency Band at 2.400 - 2.4835 GHz (Spacing at 1 or
2 MHz, GFSK)
2. 126 RF Channels
3. Air Data Rate Congurable to 2 Mbps (Options: 250 kbps, 1
Mbps)
4. 4-Pin Hardware SPI
5. 5V Tolerant Inputs
6. 6 Data Pipe MultiCeiver for 1:6 star networks
Notes: Power still at 3.3V!

Pin Map
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Important Notes
Radio is sensitive to Noises! Make sure that the circuit (wire,
solder, etc.) is stable.
Anything uxtuates is bad!
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Preparation
Getting Started
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This setup is for demo purpose only. Can be any MCUs.
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Getting
Started
Arduino IDE, NodeMCU &
Nano
1. Install RF24 Library
2. Prepare the First Node - NodeMCU
3. Prepare the Second Node - Arduino Nano

RF24 Library
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RF24 Library
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First Node - NodeMCU
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First Node - NodeMCU 14 / 51

Second Node - Nano
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Second Node - Nano 16 / 51

Code & Play
Getting Started
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Simple Transmit & Receive
NodeMCU - Transmit | Nano - Receive
Ref: Example Sketches
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#include <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"
RF24 myRadio (2, 15);
byte addresses[][6] = {"1Node"};
int dataTransmitted;
void setup()
{
Serial.begin(115200);
delay(1000);
Serial.println(F("RF24/Simple Transmit data Test"));
dataTransmitted = 100;
myRadio.begin();
myRadio.setChannel(108);
myRadio.setPALevel(RF24_PA_MIN);
myRadio.openWritingPipe( addresses[0]);
delay(1000);
}
void loop()
{
myRadio.write( &dataTransmitted, sizeof(dataTransmitted) );
Serial.print(F("Data Transmitted = "));
Serial.print(dataTransmitted);
Serial.println(F(" No Acknowledge expected"));
dataTransmitted = dataTransmitted + 1;
delay(500);
}
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NodeMCU

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NodeMCU
Serial
1384, room 16
tail 8
chksum
Data Transmitted = 100 No Acknowledge expected
Data Transmitted = 101 No Acknowledge expected
Data Transmitted = 102 No Acknowledge expected
Data Transmitted = 103 No Acknowledge expected
Data Transmitted = 104 No Acknowledge expected
Data Transmitted = 105 No Acknowledge expected
...