arduino_oregon_sci_rx
Oregon Scientific 433MHz OOK receiver and demodulator for use with the Oregon Scientific PCR800 rain guage.
Arduino
Arduino code originally came from: https://jeelabs.net/projects/cafe/wiki/Decoding_the_Oregon_Scientific_V2_protocol
Modified to use ATMEGA328 Arduino Pro Mini and the RF Solutions QAM-RX10-433 demodulator.
QAM-RX10-433 is powered by 5V.
Arduino Pin 2 connects to the 433 MHz RX digital output through a resistor divider (R1=10K, R2=20K - the output has low drive strength).
Beaglebone
The Arduino and the demodulator are mounted on a Beaglebone proto cape. This is connected to a BBB that is already being used for other purposes. RX/TX connects to BBB UART4. Reset connects to BBB header pin P9_15 (GPIO_48).
The Python script runs on the BBB and logs the rain guage measurements to a file.
The Arduino can be reflashed by exporting the hex file and copying it to the BBB, and then running:
./flash_arduino.sh
Output
Console outputs some data on every packet:
OSV3 2A190453000090572980
SUCCESS: PCR800: TS: 1551051846.209447, CODE: 53, RATE: 0.000, TOTAL: 29.579, CSUM: 0x8, COMPUTED: 0x8
RAIN 29.58 0.00
CRES 5618EA010060F1F700E501
HEZ 04FE3C0040C203
Valid packs are logged. Rolling code changes only when the battery is replaced.
Timestamp, rolling code, rain total (in), rain rate (in/hr):
1551050812.230 53 29.579 0.000
1551050859.229 53 29.579 0.000
My PCR800 generates a packet every 47 seconds. When things aren't changing the code will skip logging most of these packets. This is controlled by the variables SKIP_TRIGGER and SKIP_COUNT
SKIP_TRIGGER = 3 # Skip logging after this many identical measurements
SKIP_COUNT = 919 # While skipping, only log one out of every SKIP_COUNT messages