Good Morning..
Like all of the fellow arduinist guys I have some problems with that small modules that claim to transfer data with simple text programming... :o
Nahhh this isn't my case...
Let's start from the beginning
I have the following parts :
- 2 x GeekCreit arduino UNO
- 1 x Genuine arduino Uno
- 2 x Aideepen NRF24L01+
- 2 x Generic NRF24L01+ 2.4GHz
- 2 x 6v 10uf capacitor
- 2 x Power Supply Motherboards
- 6 x Com ports
- 3 x USB cables
STEPS
- I found the most proposed tutorial and start step by step give life to those little modules...
http://forum.arduino.cc/index.php?topic=421081
-
Installed https://tmrh20.github.io/RF24/ library
-
Rebooted
-
Made the wiring according to the tutorial. the wire colors are the same with the tutorial for easier debbuging
-
Added a 10uf capacitor with the correct polarity close to the NRF module 3.3v and ground
-
Open arduino and uploaded this code that its for NRF24 connection testing
// 18 Mar 2018 - simple program to verify connection between Arduino
// and nRF24L01+
// This program does NOT attempt any communication with another nRF24
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#include <printf.h>
#define CE_PIN 9
#define CSN_PIN 10
const byte thisSlaveAddress[5] = {'R','x','A','A','A'};
RF24 radio(CE_PIN, CSN_PIN);
char dataReceived[10]; // this must match dataToSend in the TX
bool newData = false;
void setup() {
Serial.begin(9600);
printf_begin();
Serial.println("CheckConnection Starting");
Serial.println();
Serial.println("FIRST WITH THE DEFAULT ADDRESSES after power on");
Serial.println(" Note that RF24 does NOT reset when Arduino resets - only when power is removed");
Serial.println(" If the numbers are mostly 0x00 or 0xff it means that the Arduino is not");
Serial.println(" communicating with the nRF24");
Serial.println();
radio.begin();
radio.printDetails();
Serial.println();
Serial.println();
Serial.println("AND NOW WITH ADDRESS AAAxR 0x41 41 41 78 52 ON P1");
Serial.println(" and 250KBPS data rate");
Serial.println();
radio.openReadingPipe(1, thisSlaveAddress);
radio.setDataRate( RF24_250KBPS );
radio.printDetails();
Serial.println();
Serial.println();
}
void loop() {
}
The result of this as expected is this and believe that its ok?
CheckConnection Starting
FIRST WITH THE DEFAULT ADDRESSES after power on
Note that RF24 does NOT reset when Arduino resets - only when power is removed
If the numbers are mostly 0x00 or 0xff it means that the Arduino is not
communicating with the nRF24STATUS = 0x0e RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=7 TX_FULL=0
RX_ADDR_P0-1 = 0x65646f4e31 0x4141417852
RX_ADDR_P2-5 = 0xc3 0xc4 0xc5 0xc6
TX_ADDR = 0x65646f4e31
RX_PW_P0-6 = 0x20 0x20 0x00 0x00 0x00 0x00
EN_AA = 0x3f
EN_RXADDR = 0x02
RF_CH = 0x4c
RF_SETUP = 0x03
CONFIG = 0x0e
DYNPD/FEATURE = 0x00 0x00
Data Rate = 1MBPS
Model = nRF24L01+
CRC Length = 16 bits
PA Power = PA_LOWAND NOW WITH ADDRESS AAAxR 0x41 41 41 78 52 ON P1
and 250KBPS data rateSTATUS = 0x0e RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=7 TX_FULL=0
RX_ADDR_P0-1 = 0x65646f4e31 0x4141417852
RX_ADDR_P2-5 = 0xc3 0xc4 0xc5 0xc6
TX_ADDR = 0x65646f4e31
RX_PW_P0-6 = 0x20 0x20 0x00 0x00 0x00 0x00
EN_AA = 0x3f
EN_RXADDR = 0x02
RF_CH = 0x4c
RF_SETUP = 0x23
CONFIG = 0x0e
DYNPD/FEATURE = 0x00 0x00
Data Rate = 250KBPS
Model = nRF24L01+
CRC Length = 16 bits
PA Power = PA_LOW
- Time for the SIMPLE TX code
// SimpleTx - the master or the transmitter
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#define CE_PIN 9
#define CSN_PIN 10
const byte slaveAddress[5] = {'R','x','A','A','A'};
RF24 radio(CE_PIN, CSN_PIN); // Create a Radio
char dataToSend[10] = "Message 0";
char txNum = '0';
unsigned long currentMillis;
unsigned long prevMillis;
unsigned long txIntervalMillis = 1000; // send once per second
void setup() {
Serial.begin(9600);
Serial.println("SimpleTx Starting");
radio.begin();
radio.setDataRate( RF24_250KBPS );
radio.setRetries(3,5); // delay, count
radio.openWritingPipe(slaveAddress);
}
//====================
void loop() {
currentMillis = millis();
if (currentMillis - prevMillis >= txIntervalMillis) {
send();
prevMillis = millis();
}
}
//====================
void send() {
bool rslt;
rslt = radio.write( &dataToSend, sizeof(dataToSend) );
// Always use sizeof() as it gives the size as the number of bytes.
// For example if dataToSend was an int sizeof() would correctly return 2
Serial.print("Data Sent ");
Serial.print(dataToSend);
if (rslt) {
Serial.println(" Acknowledge received");
updateMessage();
}
else {
Serial.println(" Tx failed");
}
}
//================
void updateMessage() {
// so you can see that new data is being sent
txNum += 1;
if (txNum > '9') {
txNum = '0';
}
dataToSend[8] = txNum;
}
The result of this wasn't the expected on...
TROUBLESHOOTING
-
Tried All 4 module , with all the cables , different com ports and all the arduino uno I have! (more than 20 combinations!!)
-
removed the capacitor
-
used power board for 3.3volt and connected only the nrf module there with and without the capacitor
-
rebooted many times
-
change the dupont cables with new one....
ANY IDEAS? 
