Question

我是esp32和LoRa消息传递的新手。

我正在关注heltect esp32 lora库中的两个示例。

我正在使用的发送和接收数据的两个模块显示为oled ...，然后将其值打印到串行监视器。数据值出现在oled显示屏上，但它们是串行监视器中的随机字符，例如...“⸮⸮3⸮⸮JS⸮⸮J）⸮⸮”。

我的问题是如何从发送方以字符串/浮点/整数等形式接收数据，以便对它们执行逻辑。我是c ++和lora的新手，欢迎任何帮助。

我很确定这（本段正下方的第一个代码块）是负责打印接收到的消息的代码，但是即使我更改了“ char” dtype转换为String。

while (LoRa.available()) {
  Serial.print((char)LoRa.read());
}

收件人代码

/* 
  Check the new incoming messages, and print via serialin 115200 baud rate.
  
  by Aaron.Lee from HelTec AutoMation, ChengDu, China
  成都惠利特自动化科技有限公司
  www.heltec.cn
  
  this project also realess in GitHub:
  https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series
*/

#include "heltec.h"

#define BAND    915E6  //you can set band here directly,e.g. 868E6,915E6
void setup() {
    //WIFI Kit series V1 not support Vext control
  Heltec.begin(true /*DisplayEnable Enable*/, true /*Heltec.LoRa Disable*/, true /*Serial Enable*/, true /*PABOOST Enable*/, BAND /*long BAND*/);

}

void loop() {
  // try to parse packet
  int packetSize = LoRa.parsePacket();
  if (packetSize) {
    // received a packet
    Serial.print("Received packet '");
    // read packet
    while (LoRa.available()) {
      Serial.print((char)LoRa.read());
    }
    // print RSSI of packet
    Serial.print("' with RSSI ");
    Serial.println(LoRa.packetRssi());
  }
}

发件人代码

    /* 
  Basic test program, send date at the BAND you seted.
  
  by Aaron.Lee from HelTec AutoMation, ChengDu, China
  成都惠利特自动化科技有限公司
  www.heltec.cn
  
  this project also realess in GitHub:
  https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series
*/
#include "heltec.h"
#define BAND    915E6  //you can set band here directly,e.g. 868E6,915E6

int counter = 0;

void setup() {
  
  //WIFI Kit series V1 not support Vext control
  Heltec.begin(true /*DisplayEnable Enable*/, true /*Heltec.LoRa Disable*/, true /*Serial Enable*/, true /*PABOOST Enable*/, BAND /*long BAND*/);

  
}

void loop() {
  Serial.print("Sending packet: ");
  Serial.println(counter);
  // send packet
  LoRa.beginPacket();
/*
* LoRa.setTxPower(txPower,RFOUT_pin);
* txPower -- 0 ~ 20
* RFOUT_pin could be RF_PACONFIG_PASELECT_PABOOST or RF_PACONFIG_PASELECT_RFO
*   - RF_PACONFIG_PASELECT_PABOOST -- LoRa single output via PABOOST, maximum output 20dBm
*   - RF_PACONFIG_PASELECT_RFO     -- LoRa single output via RFO_HF / RFO_LF, maximum output 14dBm
*/
  LoRa.setTxPower(14,RF_PACONFIG_PASELECT_PABOOST);
  LoRa.print("hello ");
  LoRa.print(counter);
  LoRa.endPacket();
  
  counter++;
  digitalWrite(25, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(25, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
}

Answer 1

也许串行监视器配置了错误的波特率？在我的情况下，IDE中的默认值为9600，但ESP32随115200发送。您可以在串行监视器的组合框中更改波特率。

如何通过heltec esp32在串行监视器中读取LoRa消息

1 个答案: