arduino nano and nrf24 transceiver

Using Arduino Networking, Protocols, and Devices
#1

Please friends, i need your help. here is my code, can any body tell me the reason why there is 5v ouput on digital pin 9, 10 and 11 of my aduino nano, i used digital pin 9 and 10 as CE and CSN, while 11, 12 and 13 i used for SPI connection, please, this have burned two of my NRF24 transievers, i really need your help.

/* Receiver code for the Arduino Radio control with PWM output

  • Install the NRF24 library to your IDE
  • Upload this code to the Arduino UNO, NANO, Pro mini (5V,16MHz)
  • Connect a NRF24 module to it:

Module // Arduino UNO,NANO

GND → GND
Vcc → 3.3V
CE → D9
CSN → D10
CLK → D13
MOSI → D11
MISO → D12

This code receive 7 channels and create a PWM output for each one on D2, D3, D4, D5, D6, D7and D8
Please, like share and subscribe : https://www.youtube.com/c/ELECTRONOOBS
*/

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#include <Servo.h> //To create PWM signals we need this lybrary

const uint64_t pipeIn = 0xE8E8F0F0E1LL; //Remember that this code is the same as in the transmitter
RF24 radio(9, 10); //CSN and CE pins

// The sizeof this struct should not exceed 32 bytes
struct Received_data {
byte ch1;
byte ch2;
byte ch3;
byte ch4;
byte ch5;
byte ch6;
byte ch7;
};

Received_data received_data;

Servo channel_1;
Servo channel_2;
Servo channel_3;
Servo channel_4;
Servo channel_5;
Servo channel_6;
Servo channel_7;

int ch1_value = 0;
int ch2_value = 0;
int ch3_value = 0;
int ch4_value = 0;
int ch5_value = 0;
int ch6_value = 0;
int ch7_value = 0;

/**************************************************/

void setup()
{
//Attach the servo signal on pins from D2 to D8
channel_1.attach(2);
channel_2.attach(3);
channel_3.attach(4);
channel_4.attach(5);
channel_5.attach(6);
channel_6.attach(7);
channel_7.attach(8);

//We reset the received values
received_data.ch1 = 127;
received_data.ch2 = 127;
received_data.ch3 = 127;
received_data.ch4 = 127;
received_data.ch5 = 0;
received_data.ch6 = 0;
received_data.ch7 = 0;

//Once again, begin and radio configuration
radio.begin();
radio.setAutoAck(false);
radio.setDataRate(RF24_250KBPS);
radio.openReadingPipe(1,pipeIn);

//We start the radio comunication
radio.startListening();

}

/**************************************************/

unsigned long lastRecvTime = 0;

//We create the function that will read the data each certain time
void receive_the_data()
{
while ( radio.available() ) {
radio.read(&received_data, sizeof(Received_data));
lastRecvTime = millis(); //Here we receive the data
}
}

/**************************************************/

void loop()
{
//Receive the radio data
receive_the_data();

ch1_value = map(received_data.ch1,0,255,1000,2000);
ch2_value = map(received_data.ch2,0,255,1000,2000);
ch3_value = map(received_data.ch3,0,255,1000,2000);
ch4_value = map(received_data.ch4,0,255,1000,2000);
ch5_value = map(received_data.ch5,0,1,1000,2000);
ch6_value = map(received_data.ch6,0,1,1000,2000);
ch7_value = map(received_data.ch7,0,255,1000,2000);
Serial.println(ch1_value);

//Creathe the PWM signals
channel_1.writeMicroseconds(ch1_value);
channel_2.writeMicroseconds(ch2_value);
channel_3.writeMicroseconds(ch3_value);
channel_4.writeMicroseconds(ch4_value);
channel_5.writeMicroseconds(ch5_value);
channel_6.writeMicroseconds(ch6_value);
channel_7.writeMicroseconds(ch7_value);

}//Loop end

#2

Have a look at this Simple nRF24L01+ Tutorial.

Wireless problems can be very difficult to debug so get the wireless part working on its own before you start adding any other features.

The examples are as simple as I could make them and they have worked for other Forum members. If you get stuck it will be easier to help with code that I am familiar with. Start by getting the first example to work

In my experience the nRF24 modules survive a surprising amount of abuse so you must have been trying hard to make them fail.

I believe that the 3.3v pin on a nano cannot provide enough current for an nRF24. Try powering them with a pair of AA alkaline cells (3v) with the battery GND connected to the Arduino GND.

...R

#3

Wistec:
...can any body tell me the reason why there is 5v ouput on digital pin 9, 10 and 11 of my aduino nano,
...

because you are using a 5V microcontroller - that is normal !

the nRF24 module IO pins are 5V tolerant, meaning you can connect them to 5V Arduino pins for communication without level-shifting, BUT the power (Vcc) MUST BE 3v3.

as mentioned before, the Nano 3v3 is too weak for this, the Uno one is okay (for me - using original Uno).

and don't forget to use capacitors, almost every tutorial for the nRF24 module will mention this - so far i have had success without it - although i use PA_LEVEL = min.

Wistec:
...
This code receive 7 channels and create a PWM output for each one on D2, D3, D4, D5, D6, D7and D8
Please, like share and subscribe : https://www.youtube.com/c/ELECTRONOOBS
*/
...

that is not possible - PWM pins (on Uno and Nano) are only D3, D5, D6, D9, D10 and D11.

work through Robin2's tutorial - it is THE BEST for beginners - i used it !

#4

I don't know if these are any help, but I'm currently using two of them in a project I'm working on. They have a built-in socket for the nRF24L01, with a 3.3v regulator to power it, so it doesn't draw power from the Nano. So far I've got them controlling up to 6 servos. No wiring or soldering needed, so it's likely that any problems will only be with the sketch.

#5