Cannot receive data when interfacing Lora02 with ESP8266

[huyle250398]

Hi guys, I'm a newbie of Lora, I'm using an Arduino nano as a Lora sender to send temperature and humidity, and Node MCU ESP8266 as a receiver, the sender works fine but as for ESP8266 I did not receive anything except the output " ⸮Hp⸮⸮>dh⸮⸮H<⸮⸮LoRa Receiver LoRa Initializing OK!" How can i solve this problem, please help, best regard

[IoTThinks]

What is the pin mapping? Remove your code. Use the default Receiver Callback example to check first.

[huyle250398]

my pin map is: DIO0->D2 RST-> D1 NSS-> D8 MISO->D6 MOSI->D7 I tried the callback example but still cannot read String

[IoTThinks]

Try D5, D6, D7 and D8 instead.

And force to use the above pins for SPI before LoRa.begin. The default SPI pins may not fit all boards.

SPI.begin(LORA_SCK, LORA_MISO, LORA_MOSI); LoRa.setPins(LORA_SS, LORA_RST, LORA_DIO0);

[huyle250398]

thanks bro, I'll try

[huyle250398]

I tried with uno but it still cannot receive

[IoTThinks]

Show your code and photos of your setups.

[huyle250398]

this is for sender:

include

include

include "DHT.h"

define DHTPIN A0 // dht11

define rainPin A2 // rain

define soilPin A1

define ss 14

define rst 13

define dio0 12

define DHTTYPE DHT11 // DHT 11

String myStr, myStr2; DHT dht(DHTPIN, DHTTYPE);

//Stores temperature value

int counter = 0; const int rainMin = 0; // sensor minimum const int rainMax = 1024; // sensor maximum void setup() { pinMode(ss, OUTPUT); digitalWrite(ss, HIGH); LoRa.setPins(ss, rst, dio0); Serial.begin(9600); while (!Serial); Serial.println("LoRa Sender"); dht.begin(); //initialize DHT11 // setting lora frquency if (!LoRa.begin(433E6)) { Serial.println("Starting LoRa failed!"); while (1);// if lora connection failed, do nothing } Serial.println("LoRa Initializing OK!"); } void loop() { int hum = dht.readHumidity();
int temp = dht.readTemperature(); int mois=analogRead(soilPin); int rain=analogRead(rainPin); int range = map(rain, rainMin, rainMax, 0, 3); if (isnan(hum) || isnan(temp)) {
Serial.println("Failed to read from DHT sensor!"); return; } Serial.print("Sending packet: "); Serial.println(counter); Serial.print("\n"); String msg= String(temp)+String(hum)+ String(mois)+String(rain); // send packet counter++; Serial.print(msg); LoRa.beginPacket(); LoRa.print(msg); LoRa.endPacket();

delay(5000); }

and uno receiver:

include

include

define ss 10

define rst 9

define dio0 2

void setup() { SPI.begin(); pinMode(ss, OUTPUT); digitalWrite(ss, HIGH); LoRa.setPins(ss, rst, dio0);

Serial.begin(9600); while (!Serial);

Serial.println("LoRa Receiver Callback");

if (!LoRa.begin(433E6)) { Serial.println("Starting LoRa failed!"); while (1); }

}

void loop() {

int packetSize= LoRa.parsePacket(); if(packetSize) { Serial.print("Received: "); delay(100); while(LoRa.available()) {
Serial.print((String)LoRa.read());

  }
 Serial.print("with rssi:");
  Serial.println(LoRa.packetRssi());

}

}

[IoTThinks]

1. Use the default sender code and receive callback code.

Remove your custom code.

2. Set SPI pins for esp8266. Check my previous comment.

[IoTThinks]

In esp8266, to fix the SPI pins with SPI.pins()

[IoTThinks]

ESP8266 + AI-Thinker ra01/02 is confirmed working with D5, 6, 7 and 8 as SPI pins. And D4 as interrupt.

View more at https://github.com/sandeepmistry/arduino-LoRa/issues/419#issuecomment-747509424