mini-beieli-node/README.md

mini-beieli-node - Bienenstock Ueberwachung

Code fuer den LoraWAN Node

Autor: Joerg Lehmann, nbit Informatik GmbH

Parameter	Value
Board	MCCI Catena 4610
LoraWAN Subband	"Default, works everywhere"
Serial interface	Generic Serial
LoraWAN Network	Swisscom
System Clock	24 MHz
LoraWAN Region	Europe 868 MHz
Optimize	Smallest (-Os default)

Das sind die verwendeten Libraries [1]:

URL	Commit	Commit Date
https://github.com/mcci-catena/Adafruit_BME280_Library.git	3dafbe1	Wed, 13 Dec 2017 13:56:30 -0500
https://github.com/mcci-catena/Adafruit_Sensor.git	f2af6f4	Tue, 1 Sep 2015 15:57:59 +0200
https://github.com/mcci-catena/arduino-lmic.git	9191f0c	Tue, 30 Jun 2020 09:56:19 -0400
https://github.com/mcci-catena/arduino-lorawan.git	4bc0d48	Sat, 9 May 2020 12:38:28 -0400
https://github.com/mcci-catena/Catena-Arduino-Platform.git	478ad23	Fri, 26 Jun 2020 18:39:01 -0400
https://github.com/mcci-catena/Catena-mcciadk.git	a428006	Sat, 21 Dec 2019 20:45:26 -0500
https://github.com/mcci-catena/MCCI_FRAM_I2C.git	f0a5ea5	Sat, 21 Dec 2019 16:17:01 -0500
https://github.com/tatobari/Q2-HX711-Arduino-Library.git	ccda8d8	Wed, 13 Mar 2019 12:41:44 -0300
https://github.com/sparkfun/SparkFun_Qwiic_Scale_NAU7802_Arduino_Library.git	688f255	Fri, 3 Jan 2020 12:35:22 -0700
https://github.com/mcci-catena/OneWire.git	d814a7b	Thu, 26 Apr 2018 03:45:27 +0800
https://github.com/mcci-catena/SHT1x.git	be7042c	Tue, 20 Sep 2011 13:56:23 +1000

Patch arduino-lmic, so initial SF12 is used initially:

` [joerg@cinnamon src]$ git diff diff --git a/src/lmic/lmic_bandplan_eu868.h b/src/lmic/lmic_bandplan_eu868.h index efff7d5..74efb37 100644 --- a/src/lmic/lmic_bandplan_eu868.h +++ b/src/lmic/lmic_bandplan_eu868.h @@ -61,7 +61,7 @@ LMICeu868_isValidBeacon1(const uint8_t d) { #undef LMICbandplan_isFSK #define LMICbandplan_isFSK() (/ RX datarate */LMIC.dndr == EU868_DR_FSK)

-#define LMICbandplan_getInitialDrJoin() (EU868_DR_SF7) +#define LMICbandplan_getInitialDrJoin() (EU868_DR_SF12)

void LMICeu868_setBcnRxParams(void); #define LMICbandplan_setBcnRxParams() LMICeu868_setBcnRxParams() `

[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.