我已经尝试过这么努力,但我无法理解为什么我的Tx代码中有两行:
inputString = "";
stringComplete = false;
Stop my radio
正在运作。
如果我删除了这段代码,它就会一直反复发送这些值而不能阻止它。
TX:
/* YourDuinoStarter Example: nRF24L01 Transmit Joystick values
- WHAT IT DOES: Reads Analog values on A0, A1 and transmits
them over a nRF24L01 Radio Link to another transceiver.
- SEE the comments after "//" on each line below
- CONNECTIONS: nRF24L01 Modules See:
http://arduino-info.wikispaces.com/Nrf24L01-2.4GHz-HowTo
1 - GND
2 - VCC 3.3V !!! NOT 5V
3 - CE to Arduino pin 9
4 - CSN to Arduino pin 10
5 - SCK to Arduino pin 13
6 - MOSI to Arduino pin 11
7 - MISO to Arduino pin 12
8 - UNUSED
-
Analog Joystick or two 10K potentiometers:
GND to Arduino GND
VCC to Arduino +5V
X Pot to Arduino A0
Y Pot to Arduino A1
- V1.00 11/26/13
Based on examples at http://www.bajdi.com/
Questions: terry@yourduino.com */
/*-----( Import needed libraries )-----*/
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
/*-----( Declare Constants and Pin Numbers )-----*/
#define CE_PIN 9
#define CSN_PIN 10
// NOTE: the "LL" at the end of the constant is "LongLong" type
const uint64_t pipe = 0xE8E8F0F0E1LL; // Define the transmit pipe
/*-----( Declare objects )-----*/
RF24 radio(CE_PIN, CSN_PIN); // Create a Radio
/*-----( Declare Variables )-----*/
String inputString = "";
boolean stringComplete = false;
int msg[1]; // 2 element array holding Joystick readings
int msgNum = 0;
void setup() /****** SETUP: RUNS ONCE ******/
{
Serial.begin(9600);
radio.begin();
radio.openWritingPipe(pipe);
}//--(end setup )---
void loop() /****** LOOP: RUNS CONSTANTLY ******/
{
serialEvent();
if (stringComplete) {
inputString.trim();
String on1 = "onone";
on1.trim();
String on2 = "ontwo";
on2.trim();
String off1 = "offone";
off1.trim();
String off2 = "offtwo";
off2.trim();
if (inputString.equals(on1)) {
Serial.print("1 is On");
msg[0] = 111;
radio.write(msg, 1);
inputString = "";
stringComplete = false;
} else if (inputString.equals(off1)) {
Serial.print("1 Is Off");
msg[0] = 112;
radio.write(msg, 1);
inputString = "";
stringComplete = false;
} else if (inputString.equals(on2)) {
Serial.print("2 Is On");
msg[0] = 113;
radio.write(msg, 1);
inputString = "";
stringComplete = false;
} else if (inputString.equals(off2)) {
Serial.print("2 Is Off");
msg[0] = 114;
radio.write(msg, 1);
inputString = "";
stringComplete = false;
} else {
inputString = "";
stringComplete = false;
}
}
}//--(end main loop )---
/*-----( Declare User-written Functions )-----*/
void serialEvent() {
while (Serial.available()) {
// get the new byte:
char inChar = (char)Serial.read();
delay(100);
// add it to the inputString:
inputString += inChar;
// if the incoming character is a newline, set a flag
// so the main loop can do something about it:
if (inChar == '\n') {
stringComplete = true;
}
}
}
//NONE
//*********( THE END )***********
的Rx:
/* YourDuinoStarter Example: nRF24L01 Receive Joystick values
- WHAT IT DOES: Receives data from another transceiver with
2 Analog values from a Joystick or 2 Potentiometers
Displays received values on Serial Monitor
- SEE the comments after "//" on each line below
- CONNECTIONS: nRF24L01 Modules See:
http://arduino-info.wikispaces.com/Nrf24L01-2.4GHz-HowTo
1 - GND
2 - VCC 3.3V !!! NOT 5V
3 - CE to Arduino pin 9
4 - CSN to Arduino pin 10
5 - SCK to Arduino pin 13
6 - MOSI to Arduino pin 11
7 - MISO to Arduino pin 12
8 - UNUSED
- V1.00 11/26/13
Based on examples at http://www.bajdi.com/
Questions: terry@yourduino.com */
/*-----( Import needed libraries )-----*/
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
/*-----( Declare Constants and Pin Numbers )-----*/
#define CE_PIN 9
#define CSN_PIN 10
int ledPin = 3;
// NOTE: the "LL" at the end of the constant is "LongLong" type
const uint64_t pipe = 0xE8E8F0F0E1LL; // Define the transmit pipe
/*-----( Declare objects )-----*/
RF24 radio(CE_PIN, CSN_PIN); // Create a Radio
/*-----( Declare Variables )-----*/
int msg[1]; // 2 element array holding Joystick readings
int lastMsgNum;
void setup() /****** SETUP: RUNS ONCE ******/
{
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
delay(1000);
Serial.println("Nrf24L01 Receiver Starting");
radio.begin();
radio.openReadingPipe(1,pipe);
radio.startListening();;
}//--(end setup )---
void loop() /****** LOOP: RUNS CONSTANTLY ******/
{
if ( radio.available() )
{
// Read the data payload until we've received everything
bool done = false;
while (!done)
{
// Fetch the data payload
done = radio.read( msg, sizeof(msg) );
Serial.print(msg[0]);
if (msg[0] == 111) {
digitalWrite(3, HIGH);
} else if (msg[0] == 112) {
digitalWrite(3, LOW);
} else if (msg[0] == 113) {
digitalWrite(5, HIGH);
} else if (msg[0] == 114) {
digitalWrite(5, LOW);
}
}
}
else
{
//Serial.println("No radio available");
}
}//--(end main loop )---
/*-----( Declare User-written Functions )-----*/
//NONE
//*********( THE END )***********
答案 0 :(得分:1)
我认为您不明白为什么必须初始化/设置变量。
inputString
和stringComplete
是全局变量,因此当您在serialEvent()
中更改它时,您可以在loop()
中看到它,因此当您在{{1}中读取'\ n'时}。您了解发件人已完成传输,因此您必须对其进行分析。完成相应的操作后,必须再次初始化全局变量才能重新开始。除非您这样做,否则您会看到serialEvent()
,因此您可以在stringComplete == true
的下一个周期中再次对其进行分析。
通常我们将这个布尔变量称为'flag',您可以在几个代码位置看到它以“同步”它。在这种情况下,您在完成接收时设置为true,并在完成分析后设置为false。