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NodeMcu_Etherum.ino
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NodeMcu_Etherum.ino
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#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <WebSocketsClient.h>
#include <ArduinoJson.h>
#include <string.h>
#include <SoftwareSerial.h>
#include <Web3.h>
const char* ssid = "yuvraj";
const char* password = "12345678";
const char* web3Provider = "remix.etherum.org";
const char* contractAddress = "0x80c8A8c9C122519076d471eC1BDcAc3e310eD622";
const char* privateKey = "zdYDzo7kcnIeqaq6uMRzXfv3VKGpeNquluHoS5Kj";
const int sensorPin = A0;
Web3 web3(web3Provider);
Web3Contract contract(web3, contractAddress);
SoftwareSerial softSerial(4, 5); // RX, TX
void setup() {
pinMode(sensorPin, INPUT);
Serial.begin(9600);
softSerial.begin(9600);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
}
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
web3.setPrivateKey(privateKey);
}
void loop() {
float sensorValue = analogRead(sensorPin);
Serial.print("Temperature: ");
Serial.println(temperature);
DynamicJsonDocument doc(128);
doc["data"] = sensorValue;
String jsonStr;
serializeJson(doc, jsonStr);
Serial.println("Sending data to smart contract...");
contract.call("sendData", jsonStr.c_str());
delay(5000); // Wait 5 seconds before sending the next data point
}