Create rx.py

electrical/lora/rx.py

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+import time
+import spidev
+import RPi.GPIO as GPIO
+from lora import LoRa, ModemConfig  # Import your LoRa library (similar to RH_RF95)
+
+# Pin configuration for RFM95
+RFM95_CS = 10
+RFM95_RST = 9
+RFM95_INT = 25  # GPIO25 (adjust to your setup)
+
+# Frequency configuration (must match transmitter)
+RF95_FREQ = 915.0
+
+# Blinky LED on receipt (GPIO13)
+LED = 13
+
+# Setup GPIO
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(LED, GPIO.OUT)
+GPIO.setup(RFM95_RST, GPIO.OUT)
+
+# Initialize SPI
+spi = spidev.SpiDev()
+spi.open(0, 0)  # Open SPI bus 0, device (CS) 0
+spi.max_speed_hz = 500000
+
+# Initialize LoRa object
+lora = LoRa(cs_pin=RFM95_CS, int_pin=RFM95_INT, reset_pin=RFM95_RST, spi=spi)
+
+def setup():
+    GPIO.output(RFM95_RST, GPIO.HIGH)
+    time.sleep(0.1)
+
+    # Manually reset the LoRa module
+    GPIO.output(RFM95_RST, GPIO.LOW)
+    time.sleep(0.01)
+    GPIO.output(RFM95_RST, GPIO.HIGH)
+    time.sleep(0.01)
+
+    print("Raspberry Pi LoRa RX Test")
+
+    # Initialize LoRa module
+    if not lora.init():
+        print("LoRa radio init failed")
+        while True:
+            time.sleep(1)
+    print("LoRa radio init OK!")
+
+    # Set frequency
+    if not lora.set_frequency(RF95_FREQ):
+        print("Set frequency failed")
+        while True:
+            time.sleep(1)
+    print(f"Set Freq to: {RF95_FREQ} MHz")
+
+    # Set transmission power (23 dBm)
+    lora.set_tx_power(23, use_pa_boost=True)
+
+def loop():
+    while True:
+        # Check if data is available to be received
+        if lora.received_packet():
+            # Blink the LED on receiving data
+            GPIO.output(LED, GPIO.HIGH)
+
+            # Read the received message
+            message = lora.read_payload()
+            rssi = lora.last_rssi()
+
+            print(f"Received: {message}")
+            print(f"RSSI: {rssi}")
+
+            # Send a reply message
+            reply_message = "And hello back to you"
+            lora.send_packet(reply_message.encode('utf-8'))
+            print("Sent a reply")
+
+            # Turn off LED after sending reply
+            GPIO.output(LED, GPIO.LOW)
+
+        time.sleep(1)
+
+if __name__ == "__main__":
+    try:
+        setup()
+        loop()
+    except KeyboardInterrupt:
+        print("Exiting")
+        GPIO.cleanup()