//when the cs pin is low then spi sensor is active
//when the cs pin is high then spi is inactive  
#include <SPI.h>

#define CS 10

void setup() {
  // put your setup code here, to run once:

  char buffer[]="HELLO!";
  Serial.begin(115200);
  pinMode(CS,OUTPUT);

  digitalWrite(CS, LOW);
  SPI.begin();
  SPI.transfer(buffer,strlen(buffer));
  SPI.end();

  digitalWrite(CS,HIGH);

  Serial.print("DATA RECEIVED!!");
  Serial.println(buffer) ;


}

void loop() {
  // put your main code here, to run repeatedly:

}