I'm newbie at this topic. I'm actually beginner at arduino. I'm trying to send some data from Arduino to Raspberry Pi and Raspberry Pi to Arduino. I can ping back and ping out from Arduino to Raspberry Pi but can't from Raspberry Pi to Arduino. Other hand i have to send message to each other. Not ping. I mean Raspberry Pi send some data to Arduinos and the Ardino that should accepted one send back some data to Raspberry Pi. I used to use RF24 library on github but can't handle the situation. Here is my Arduino sketch.
/*
Copyright (C) 2011 J. Coliz <[email protected]>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.
*/
/**
* Example for Getting Started with nRF24L01+ radios.
*
* This is an example of how to use the RF24 class. Write this sketch to two
* different nodes. Put one of the nodes into 'transmit' mode by connecting
* with the serial monitor and sending a 'T'. The ping node sends the current
* time to the pong node, which responds by sending the value back. The ping
* node can then see how long the whole cycle took.
*/
#include <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"
#include "printf.h"
#include <dht11.h>
#define DHT11PIN 2
dht11 DHT11;
//
// Hardware configuration
//
// Set up nRF24L01 radio on SPI bus plus pins 9 & 10
RF24 radio(9,10);
//
// Topology
//
// Radio pipe addresses for the 2 nodes to communicate.
const uint64_t pipes[2] = { 0xF0F0F0F0E1LL, 0xF0F0F0F0D2LL };
//
// Role management
//
// Set up role. This sketch uses the same software for all the nodes
// in this system. Doing so greatly simplifies testing.
//
// The various roles supported by this sketch
typedef enum { role_ping_out = 1, role_pong_back } role_e;
// The debug-friendly names of those roles
const char* role_friendly_name[] = { "invalid", "Ping out", "Pong back"};
// The role of the current running sketch
role_e role = role_pong_back;
void setup(void)
{
//
// Print preamble
//
Serial.begin(57600);
printf_begin();
printf("\n\rRF24/examples/GettingStarted/\n\r");
printf("ROLE: %s\n\r",role_friendly_name[role]);
printf("*** PRESS 'T' to begin transmitting to the other node\n\r");
//
// Setup and configure rf radio
//
radio.begin();
// optionally, increase the delay between retries & # of retries
radio.setRetries(15,15);
// optionally, reduce the payload size. seems to
// improve reliability
//radio.setPayloadSize(8);
//
// Open pipes to other nodes for communication
//
// This simple sketch opens two pipes for these two nodes to communicate
// back and forth.
// Open 'our' pipe for writing
// Open the 'other' pipe for reading, in position #1 (we can have up to 5 pipes open for reading)
//if ( role == role_ping_out )
{
//radio.openWritingPipe(pipes[0]);
radio.openReadingPipe(1,pipes[1]);
}
//else
{
//radio.openWritingPipe(pipes[1]);
//radio.openReadingPipe(1,pipes[0]);
}
//
// Start listening
//
radio.startListening();
//
// Dump the configuration of the rf unit for debugging
//
radio.printDetails();
}
void loop(void)
{
int chk = DHT11.read(DHT11PIN);
//
// Ping out role. Repeatedly send the current time
//
if (role == role_ping_out)
{
// First, stop listening so we can talk.
radio.stopListening();
// Take the time, and send it. This will block until complete
unsigned char message[16] = "Hello, Arduino!";
bool ok = radio.write( &message, sizeof(unsigned char) * 16);
if (ok)
printf("ok...");
else
printf("failed.\n\r");
// Now, continue listening
radio.startListening();
// Wait here until we get a response, or timeout (250ms)
unsigned long started_waiting_at = millis();
bool timeout = false;
while ( ! radio.available() && ! timeout )
if (millis() - started_waiting_at > 200 )
timeout = true;
// Describe the results
if ( timeout )
{
printf("Failed, response timed out.\n\r");
}
else
{
// Grab the response, compare, and send to debugging spew
unsigned long got_time;
radio.read( &got_time, sizeof(unsigned long) );
// Spew it
Serial.print("Sicaklik (Celcius): ");
Serial.println((float)DHT11.temperature, 2);
Serial.print("Nem (%): ");
Serial.println((float)DHT11.humidity, 2);
}
// Try again 1s later
delay(1000);
}
//
// Pong back role. Receive each packet, dump it out, and send it back
//
if ( role == role_pong_back )
{
// if there is data ready
if( radio.available()){
while (radio.available()) {
char message[16];
radio.read( &message, sizeof(char) * 16);
Serial.print(F("Got message: "));
Serial.println(String(message));
}
radio.stopListening();
radio.startListening();
}
}
//
// Change roles
//
if ( Serial.available() )
{
char c = toupper(Serial.read());
if ( c == 'T' && role == role_pong_back )
{
printf("*** CHANGING TO TRANSMIT ROLE -- PRESS 'R' TO SWITCH BACK\n\r");
// Become the primary transmitter (ping out)
role = role_ping_out;
radio.openWritingPipe(pipes[0]);
radio.openReadingPipe(1,pipes[1]);
}
else if ( c == 'R' && role == role_ping_out )
{
printf("*** CHANGING TO RECEIVE ROLE -- PRESS 'T' TO SWITCH BACK\n\r");
// Become the primary receiver (pong back)
role = role_pong_back;
radio.openWritingPipe(pipes[1]);
radio.openReadingPipe(1,pipes[0]);
}
}
}
Here is my C++ code run on Raspberry Pi.
/*
Copyright (C) 2011 J. Coliz <[email protected]>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.
03/17/2013 : Charles-Henri Hallard (http://hallard.me)
Modified to use with Arduipi board http://hallard.me/arduipi
Changed to use modified bcm2835 and RF24 library
TMRh20 2014 - Updated to work with optimized RF24 Arduino library
*/
/**
* Example RF Radio Ping Pair
*
* This is an example of how to use the RF24 class on RPi, communicating to an Arduino running
* the GettingStarted sketch.
*/
#include <cstdlib>
#include <iostream>
#include <sstream>
#include <string>
#include <unistd.h>
#include <RF24/RF24.h>
using namespace std;
//
// Hardware configuration
// Configure the appropriate pins for your connections
/****************** Raspberry Pi ***********************/
// Radio CE Pin, CSN Pin, SPI Speed
// See http://www.airspayce.com/mikem/bcm2835/group__constants.html#ga63c029bd6500167152db4e57736d0939 and the related enumerations for pin information.
// Setup for GPIO 22 CE and CE0 CSN with SPI Speed @ 4Mhz
//RF24 radio(RPI_V2_GPIO_P1_22, BCM2835_SPI_CS0, BCM2835_SPI_SPEED_4MHZ);
// NEW: Setup for RPi B+
//RF24 radio(RPI_BPLUS_GPIO_J8_15,RPI_BPLUS_GPIO_J8_24, BCM2835_SPI_SPEED_8MHZ);
// Setup for GPIO 15 CE and CE0 CSN with SPI Speed @ 8Mhz
//RF24 radio(RPI_V2_GPIO_P1_15, RPI_V2_GPIO_P1_24, BCM2835_SPI_SPEED_8MHZ);
// RPi generic:
RF24 radio(22,0);
/*** RPi Alternate ***/
//Note: Specify SPI BUS 0 or 1 instead of CS pin number.
// See http://tmrh20.github.io/RF24/RPi.html for more information on usage
//RPi Alternate, with MRAA
//RF24 radio(15,0);
//RPi Alternate, with SPIDEV - Note: Edit RF24/arch/BBB/spi.cpp and set 'this->device = "/dev/spidev0.0";;' or as listed in /dev
//RF24 radio(22,0);
/****************** Linux (BBB,x86,etc) ***********************/
// See http://tmrh20.github.io/RF24/pages.html for more information on usage
// See http://iotdk.intel.com/docs/master/mraa/ for more information on MRAA
// See https://www.kernel.org/doc/Documentation/spi/spidev for more information on SPIDEV
// Setup for ARM(Linux) devices like BBB using spidev (default is "/dev/spidev1.0" )
//RF24 radio(115,0);
//BBB Alternate, with mraa
// CE pin = (Header P9, Pin 13) = 59 = 13 + 46
//Note: Specify SPI BUS 0 or 1 instead of CS pin number.
//RF24 radio(59,0);
/********** User Config *********/
// Assign a unique identifier for this node, 0 or 1
bool radioNumber = 1;
/********************************/
// Radio pipe addresses for the 2 nodes to communicate.
const uint64_t pipes[2] = { 0xF0F0F0F0E1LL, 0xF0F0F0F0D2LL };
int main(int argc, char** argv){
bool role_ping_out = true, role_pong_back = false;
bool role = role_pong_back;
cout << "RF24/examples/GettingStarted/\n";
// Setup and configure rf radio
radio.begin();
// optionally, increase the delay between retries & # of retries
radio.setRetries(15,15);
// Dump the configuration of the rf unit for debugging
radio.printDetails();
/********* Role chooser ***********/
printf("\n ************ Role Setup ***********\n");
string input = "";
char myChar = {0};
cout << "Choose a role: Enter 0 for pong_back, 1 for ping_out (CTRL+C to exit) \n>";
getline(cin,input);
if(input.length() == 1) {
myChar = input[0];
if(myChar == '0'){
cout << "Role: Pong Back, awaiting transmission " << endl << endl;
}else{ cout << "Role: Ping Out, starting transmission " << endl << endl;
role = role_ping_out;
}
}
/***********************************/
// This simple sketch opens two pipes for these two nodes to communicate
// back and forth.
if ( !radioNumber ) {
radio.openWritingPipe(pipes[0]);
radio.openReadingPipe(1,pipes[1]);
} else {
radio.openWritingPipe(pipes[1]);
radio.openReadingPipe(1,pipes[0]);
}
radio.startListening();
// forever loop
while (1)
{
if (role == role_ping_out)
{
// First, stop listening so we can talk.
radio.stopListening();
// Take the time, and send it. This will block until complete
printf("Now sending...\n");
unsigned char message[16] = "Hello, Arduino!";
bool ok = radio.write( &message, sizeof(unsigned char) * 16);
if (!ok){
printf("failed.\n");
}
// Now, continue listening
radio.startListening();
// Wait here until we get a response, or timeout (250ms)
unsigned long started_waiting_at = millis();
bool timeout = false;
while ( ! radio.available() && ! timeout ) {
if (millis() - started_waiting_at > 200 )
timeout = true;
}
// Describe the results
if ( timeout )
{
printf("Failed, response timed out.\n");
}
else
{
// Grab the response, compare, and send to debugging spew
unsigned long got_time;
radio.read( &got_time, sizeof(unsigned long) );
// Spew it
printf("Got response %lu, round-trip delay: %lu\n",got_time,millis()-got_time);
}
sleep(1);
}
//
// Pong back role. Receive each packet, dump it out, and send it back
//
if ( role == role_pong_back )
{
// if there is data ready
if ( radio.available() )
{
// Dump the payloads until we've gotten everything
unsigned long got_time;
// Fetch the payload, and see if this was the last one.
while(radio.available()){
radio.read( &got_time, sizeof(unsigned long) );
}
radio.stopListening();
radio.write( &got_time, sizeof(unsigned long) );
// Now, resume listening so we catch the next packets.
radio.startListening();
// Spew it
printf("Got payload(%d) %lu...\n",sizeof(unsigned long), got_time);
delay(925); //Delay after payload responded to, minimize RPi CPU time
}
}
} // forever loop
return 0;
}
I'm really stuck now. I control my cables many times. But there is no difference.
