#include <SPI.h>
#include <mcp_can.h>  

#define BTN 16  
#define LED 16 

MCP_CAN mcp2515(5);  

void setup() {
  pinMode(BTN, INPUT);
  pinMode(LED, OUTPUT);  

  Serial.begin(115200);  

  if (mcp2515.begin(MCP_ANY, CAN_125KBPS, MCP_16MHZ)) {
    Serial.println("MCP2515 success");
  } else {
    Serial.println("MCP2515  Failed");
    while (1);  
  }
}

void loop() {
  byte canData[8];  
  unsigned long canId;
  byte len;

  if (!digitalRead(BTN)) { 
    Serial.println("Button pressed"); 
    canData[0] = 0x01;  
Serial.println("Sending message");
    
    mcp2515.sendMsgBuf(0x01, 0, 1, canData);  
    delay(500);  
  }

 
  if (mcp2515.readMsgBuf(&canId, &len, canData)) {  
    if (canId == 0x01 && canData[0] == 0x01) {  
      digitalWrite(LED, HIGH); 
    } else {
      digitalWrite(LED, LOW); 
    }
  }
}