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README update

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Joerg Lehmann 2020-06-29 15:59:46 +02:00
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`[1]:
[joerg@cinnamon libraries]$ for i in Adafruit_BME280_Library Adafruit_Sensor arduino-lmic arduino-lorawan Catena-Arduino-Platform Catena-mcciadk MCCI_FRAM_I2C Q2-HX711-Arduino-Library SparkFun_Qwiic_Scale_NAU7802_Arduino_Library OneWire SHT1x ; do cd $i; echo "| $(git remote -v |grep fetch |awk '{print $2}' |tr '\n' ' ') | $(git log --pretty=format:'%h | %cD ' -n 1) |" ; cd ..; done`
## Some Facts about RSSI and SNR
https://lora.readthedocs.io/en/latest/#rssi
RSSI minimum = -120 dBm.
RSSI < -90 dBm: this signal is extremely weak, at the edge of what a receiver can receive.
RSSI -67dBm: this is a fairly strong signal.
RSSI > -55dBm: this is a very strong signal.
RSSI > -30dBm: your sniffer is sitting right next to the transmitter.
https://lora.readthedocs.io/en/latest/#snr
Typical LoRa SNR values are between: -20dB and +10dB
A value closer to +10dB means the received signal is less corrupted.
LoRa can demodulate signals which are -7.5 dB to -20 dB below the noise floor.