fs1000a_transmitter.ino

#include <VirtualWire.h>

uint8_t counter = 0; 

void setup() {
    /*
     * Set TX pin -> Connect FS1000A here
     */
    vw_set_tx_pin(12);
    /*
     * Set RX pin -> Connect XY-MK-5V here
     */
    vw_set_rx_pin(11);
    
    /*
     * Set transmission speed. Reciver and trasmitter have to use the same speed
     */
    vw_setup(1000);
}

void loop() {

  char msg[1];

  msg[0] = counter;

  /*
   * Send buffer
   */
  vw_send((uint8_t *)msg, 1);
  /*
   * Wait until trasmission is complete
   */
  vw_wait_tx();
  
  counter++;
  delay(1000);
}