66 lines
2.1 KiB
Python
66 lines
2.1 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
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# Author: Jerry Needell
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#
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import random
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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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from adafruit_rfm import rfm9xfsk
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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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rfm9xfsk = rfm9xfsk.RFM9xFSK(spi, CS, RESET, RADIO_FREQ_MHZ)
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node = 2
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destination = 1
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rfm9xfsk.radiohead = False
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rfm9xfsk.enable_address_filter = True
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rfm9xfsk.fsk_node_address = node
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rfm9xfsk.fsk_broadcast_address = 0xFF
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# set the time interval (seconds) for sending packets
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transmit_interval = 2
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# Note that the radio is configured in LoRa mode so you can't control sync
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# word, encryption, frequency deviation, or other settings!
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# You can however adjust the transmit power (in dB). The default is 13 dB but
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# high power radios like the RFM95 can go up to 23 dB:
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# rfm9xfsk.tx_power = 23
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# initialize counter
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counter = 0
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# send a startup mesage
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rfm9xfsk.send(bytes(f"message number {counter}", "UTF-8"), destination=destination)
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# Wait to receive packets.
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print("Waiting for packets...")
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# initialize flag and timer
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time_now = time.monotonic()
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while True:
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# Look for a new packet - wait up to 2 seconds:
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packet = rfm9xfsk.receive(timeout=0.5)
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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(f"Received (raw bytes): {packet}", rfm9xfsk.last_rssi)
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if time.monotonic() - time_now > transmit_interval + random.random():
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counter = counter + 1
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rfm9xfsk.send(bytes(f"message number {counter}", "UTF-8"), destination=destination)
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time_now = time.monotonic()
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