# import the libraries
from machine import Pin, SPI
import sx127x
import time

# create an SPI object
spi = SPI(0)

# create an SX1278 object
lora = sx127x.SX127x(spi=spi, pins={'ss': Pin(17), 'reset': Pin(18), 'dio_0': Pin(16), 'dio_1': Pin(15)})

# set the frequency, bandwidth, spreading factor, coding rate, and power
lora.set_frequency(433)
lora.set_bandwidth(7)
lora.set_spreading_factor(7)
lora.set_coding_rate(5)
lora.set_tx_power(14)

# create a message to send
message = 'ping'

# loop forever
while True:
  # send the message
  lora.println(message)
  print('Sent: ' + message)

  # wait for 3 seconds
  time.sleep(3)