我目前有一个设置,我使用 434MHz 的 Tx 和一个 Uno 向带有 Rx 的 Mega 发送一个字符。Mega 会计算它收到 char 的次数,然后如果它低于某个数字,它就会触发警报。这是在室内测量两个微控制器之间距离的可行方法还是有更好的方法。
发射器(兆)
#include <SoftwareSerial.h>
int rxPin=2; //Goes to the Receiver Pin
int txPin=5; //Make sure it is set to pin 5 going to input of receiver
SoftwareSerial txSerial = SoftwareSerial(rxPin, txPin);
SoftwareSerial rxSerial = SoftwareSerial(txPin, rxPin);
char sendChar ='H';
void setup() {
pinMode(rxPin, INPUT);
pinMode(txPin,OUTPUT);
txSerial.begin(2400);
rxSerial.begin(2400);
}
void loop() {
txSerial.println(sendChar);
Serial.print(sendChar);
}
接收者
#include <SoftwareSerial.h>
//Make sure it is set to pin 5 going to the data input of the transmitter
int rxPin=5;
int txPin=3; //Don't need to make connections
int LED=13;
int BUZZ=9;
int t=0;
char incomingChar = 0;
int counter = 0;
SoftwareSerial rxSerial = SoftwareSerial(rxPin, txPin);
void setup() {
pinMode(rxPin, INPUT); //initilize rxpin as input
pinMode(BUZZ, OUTPUT); //initilize buzz for output
pinMode(LED, OUTPUT); //initilize led for output
rxSerial.begin(2400); //set baud rate for transmission
Serial.begin(2400); //see above
}
void loop() {
for(int i=0; i<200; i++) {
incomingChar = rxSerial.read(); //read incoming msg from tx
if (incomingChar =='H') {
counter++; //if we get bit "h" count it
}
delay(5); //delay of 10 secs
}
Serial.println(incomingChar);
Serial.println(counter); //prints the the bits we recieved
if(counter<55) {
//if we receive less than 100 bits than print out of range triggers alarm
Serial.println("out of range");
tone(BUZZ,5000,500);digitalWrite(LED,HIGH);
}
else {
noTone(BUZZ);digitalWrite(LED, LOW);
//if we get more than 100 bits than we are within range turn off alarm
Serial.println("in range");
}
counter = 0;
incomingChar=0;
}