87 lines
2.7 KiB
Python
87 lines
2.7 KiB
Python
# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
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# SPDX-License-Identifier: MIT
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# Example to send a packet periodically between addressed nodes
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# Author: Jerry Needell
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#
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import time
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import board
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import busio
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import digitalio
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# Define radio parameters.
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RADIO_FREQ_MHZ = 915.0 # Frequency of the radio in Mhz. Must match your
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# module! Can be a value like 915.0, 433.0, etc.
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# Define pins connected to the chip, use these if wiring up the breakout according to the guide:
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CS = digitalio.DigitalInOut(board.CE1)
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RESET = digitalio.DigitalInOut(board.D25)
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# Initialize SPI bus.
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spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
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# Initialze RFM radio
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# uncommnet the desired import and rfm initialization depending on the radio boards being used
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# Use rfm9x for two RFM9x radios using LoRa
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from adafruit_rfm import rfm9x
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rfm = rfm9x.RFM9x(spi, CS, RESET, RADIO_FREQ_MHZ)
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# Use rfm9xfsk for two RFM9x radios or RFM9x to RFM69 using FSK
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# from adafruit_rfm import rfm9xfsk
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# rfm = rfm9xfsk.RFM9xFSK(spi, CS, RESET, RADIO_FREQ_MHZ)
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# Use rfm69 for two RFM69 radios using FSK
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# from adafruit_rfm import rfm69
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# rfm = rfm69.RFM69(spi, CS, RESET, RADIO_FREQ_MHZ)
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# For RFM69 only: Optionally set an encryption key (16 byte AES key). MUST match both
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# on the transmitter and receiver (or be set to None to disable/the default).
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# rfm.encryption_key = None
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# rfm.encryption_key = (
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# b"\x01\x02\x03\x04\x05\x06\x07\x08\x01\x02\x03\x04\x05\x06\x07\x08"
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# )
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# for OOK on RFM69 or RFM9xFSK
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# rfm.modulation_type = 1
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# set the time interval (seconds) for sending packets
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transmit_interval = 2
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# set node addresses
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rfm.node = 1
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rfm.destination = 100
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# initialize counter
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counter = 0
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# send a broadcast message from my_node with ID = counter
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rfm.send(bytes(f"Startup message {counter} from node {rfm.node}", "UTF-8"))
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# Wait to receive packets.
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print("Waiting for packets...")
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now = time.monotonic()
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while True:
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# Look for a new packet: only accept if addresses to my_node
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packet = rfm.receive(with_header=True, timeout=5.0)
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# If no packet was received during the timeout then None is returned.
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if packet is not None:
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# Received a packet!
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# Print out the raw bytes of the packet:
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print("Received (raw header):", [hex(x) for x in packet[0:4]])
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print(f"Received (raw payload): {packet[4:]}")
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print(f"Received RSSI: {rfm.last_rssi}")
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if time.monotonic() - now > transmit_interval:
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now = time.monotonic()
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counter = counter + 1
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# send a mesage to destination_node from my_node
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rfm.send(
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bytes(f"message number {counter} from node {rfm.node}", "UTF-8"),
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keep_listening=True,
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)
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button_pressed = None
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