lora_sender.py

from machine import Pin, SPI
from sx127x import SX127x #https://github.com/abuvanth/micropython-sx127x/blob/master/sx127x.py
import time
import neopixel
# Define the pins (adjust based on your ESP32 board and wiring)
MOSI_PIN = 4
MISO_PIN = 0
SCK_PIN = 1
NSS_PIN = 5
DIO0_PIN = 10
pin = Pin(7, Pin.OUT)   # Example pin number
np = neopixel.NeoPixel(pin, 1)
# Configure the SPI interface
spi = SPI(baudrate=10000000, polarity=0, phase=0, bits=8, firstbit=SPI.MSB, sck=Pin(SCK_PIN), mosi=Pin(MOSI_PIN), miso=Pin(MISO_PIN))

# Configure NSS and DIO0
nss = Pin(NSS_PIN, mode=Pin.OUT, value=1)
dio0 = Pin(DIO0_PIN, mode=Pin.IN)

# LoRa configuration
lora_config = {
    'frequency': 433E6,        
    'tx_power_level': 20,       
    'signal_bandwidth': 125E3,  
    'spreading_factor': 12,     
    'coding_rate': 5,           
    'preamble_length': 12,     
    'implicit_header': False,   
    'sync_word': 0x12,         
    'enable_crc': True,         
    'invert_iq': False,         
}

# Initialize LoRa
lora = SX127x(spi, pins={'miso': MISO_PIN, 'mosi': MOSI_PIN, 'ss': NSS_PIN, 'sck': SCK_PIN, 'dio_0': DIO0_PIN}, parameters=lora_config)

# Example function to send a message
def send_message():
    np[0] = (255, 0, 0)  # Red color
    np.write()
    message = "Hello LoRa from 1"
    lora.println(message)
    np[0] = (0, 0, 0)  # Red color
    np.write()
    print("Message sent: ", message)


while 1:
    send_message()
    time.sleep(2)