Wi-Fi Connection [Serial]

💡

NodeMCU are available and will be used for Wi-Fi connectivity and serial communication will be used for data transfer

Connection [Serial]:

NodeMCU	Spresense Extension Board
GND	GND
Vin	Vout
RX	TX
TX	RX

Code Testing

Spresense:


#include <SoftwareSerial.h>
#include <ArduinoJson.h>

SoftwareSerial nodemcu(0, 1); // RX, TX

void setup() {
  Serial.begin(9600);
  nodemcu.begin(9600);
  delay(1000);
  serial.println("Test Started");
}

Void loop()
{
    // Start JSON data
    StaticJsonBuffer<1000> jsonBuffer;
    JsonObject& data = jsonBuffer.createObject();

    // Add values to JSON data
    data["test1"] = "ok";
    data["test2"] = "working";

    // Send JSON data to nodeMCU

    data.printTo(nodemcu);
    jsonBuffer.clear();
    delay(2000);
}

NodeMCU:


#include <SoftwareSerial.h>
#include <ArduinoJson.h>

SoftwareSerial nodemcu(D6, D5); // RX, TX

void setup() {  
  Serial.begin(9600);
  nodemcu.begin(9600);
  while (!Serial); continue;
}

void loop()
{
    StaticJsonBuffer<1000> jsonBuffer;
    JsonObject& data = jsonBuffer.parseObject(nodemcu);

    if (data == JsonObject::invalid()) {
        Serial.println("Invalid JSON");
        jsonBuffer.clear();
        return;
    }

    serial.println("JSON Object Recieved:");
    String first = data["test1"];
    serial.println(first);
    String second = data["test2"];
    serial.println(second);
    Serial.println("-----------------------------------------");
}