Exploring LoRa RYLR896 with MicroPython
In this article, we will explore the Reyax LoRa module RYLR896 using MicroPython. For this we will used both a Raspberry Pi Pico and an ESP32.
PINOUT:
From left to right facing front.
- VDD – for the supply voltage. This should be provided with minimum of 2V to 3.6V maximum.
- NRST – for the active-low RESET pin. This could be tied to microcontroller’s ground so that when microcontroller is reset, so the LoRa is also be resetted.
- RXD – for the UART serial receive pin.
- TXD – for the UART serial transmit pin.
- N/C – not connected.
- GND – for the ground pin.
CIRCUIT DIAGRAM:
Raspberry Pi Pico with RYLR896:
- Connect RYLR896 VDD to Pico 3.3V pin.
- Connect RYLR896 RXD to Pico pin 6.
- Connect RYLR896 TXD to Pico pin 7.
- Connect RYLR896 GND to Pico GND pin.
ESP32 with RYLR896:
- Connect RYLR896 VDD to ESP32 3.3V pin.
- Connect RYLR896 RXD to ESP32 GPIO 26.
- Connect RYLR896 TXD to ESP32 GPIO 27.
- Connect RYLR896 GND to ESP32 GND pin.
VIDEO DEMONSTRATION:
CALL TO ACTION:
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– George Bantique | tech.to.tinker@gmail.com
SOURCE CODE:
1. For the Raspberry Pi Pico:
# More details can be found in TechToTinker.blogspot.com
# George Bantique | tech.to.tinker@gmail.com
from machine import Pin, UART
from time import sleep_ms
class RYLR896:
def __init__(self, port_num, tx_pin='', rx_pin=''):
if tx_pin=='' and rx_pin=='':
self._uart = UART(port_num)
else:
self._uart = UART(port_num, tx=tx_pin, rx=rx_pin)
def cmd(self, lora_cmd):
self._uart.write('{}rn'.format(lora_cmd))
while(self._uart.any()==0):
pass
reply = self._uart.readline()
print(reply.decode().strip('rn'))
def test(self):
self._uart.write('ATrn')
while(self._uart.any()==0):
pass
reply = self._uart.readline()
print(reply.decode().strip('rn'))
def set_addr(self, addr):
self._uart.write('AT+ADDRESS={}rn'.format(addr))
while(self._uart.any()==0):
pass
reply = self._uart.readline()
print(reply.decode().strip('rn'))
print('Address set to:{}rn'.format(addr))
def send_msg(self, addr, msg):
self._uart.write('AT+SEND={},{},{}rn'.format(addr,len(msg),msg))
while(self._uart.any()==0):
pass
reply = self._uart.readline()
print(reply.decode().strip('rn'))
def read_msg(self):
if self._uart.any()==0:
print('Nothing to show.')
else:
msg = ''
while(self._uart.any()):
msg = msg + self._uart.read(self._uart.any()).decode()
print(msg.strip('rn'))
lora = RYLR896(1) # Sets the UART port to be use
sleep_ms(100)
lora.set_addr(1) # Sets the LoRa address
2. For the ESP32:
# More details can be found in TechToTinker.blogspot.com
# George Bantique | tech.to.tinker@gmail.com
from machine import Pin, UART
from time import sleep_ms
class RYLR896:
def __init__(self, port_num, tx='', rx=''):
if tx=='' and rx=='':
self._uart = UART(port_num)
else:
self._uart = UART(port_num, tx=tx, rx=rx)
def cmd(self, lora_cmd):
self._uart.write('{}rn'.format(lora_cmd))
while(self._uart.any()==0):
pass
reply = self._uart.readline()
print(reply.decode().strip('rn'))
def test(self):
self._uart.write('ATrn')
while(self._uart.any()==0):
pass
reply = self._uart.readline()
print(reply.decode().strip('rn'))
def set_addr(self, addr):
self._uart.write('AT+ADDRESS={}rn'.format(addr))
while(self._uart.any()==0):
pass
reply = self._uart.readline()
print(reply.decode().strip('rn'))
print('Address set to:{}rn'.format(addr))
def send_msg(self, addr, msg):
self._uart.write('AT+SEND={},{},{}rn'.format(addr,len(msg),msg))
while(self._uart.any()==0):
pass
reply = self._uart.readline()
print(reply.decode().strip('rn'))
def read_msg(self):
if self._uart.any()==0:
print('Nothing to show.')
else:
msg = ''
while(self._uart.any()):
msg = msg + self._uart.read(self._uart.any()).decode()
print(msg.strip('rn'))
lora = RYLR896(2,rx=27,tx=26) # Sets the UART port to be use
sleep_ms(100)
lora.set_addr(2) # Sets the LoRa address
REFERENCES AND CREDITS:
1. More details from the official page of RYLR896
2. RYLR896 Datasheet:
3. RYLR896 AT Command Reference:
hi George,
Do you know how to do a hardware reset on the RYLR896?
I tried grounding pin 2 – NRST with no effect.
Es posible almacenar en una variable el valor de lora.read_msg()