comnets-bremen / wusn

MoleNet: A Wireless Underground Sensor Network platform

MoleNet: A Wireless Underground Sensor Network Platform

Wireless Underground Sensor Network platform (PCB, Arduino-Source and example server)

This is an active project and the files in this directory (and the structure of the project itself) are subject to change!

Prerequisites

The following Arduino libraries are required:

• LowPower: https://github.com/LowPowerLab/LowPower
• RFM69: https://www.github.com/lowpowerlab/rfm69
• RV8523: https://github.com/watterott/Arduino-Libs
• spieep: https://bitbucket.org/spirilis/spieep/

MoleNet (rev. 1.0)

Settings for the Arduino IDE

Arduino IDE:

• Tools -> Board: "Arduino Pro or Pro Mini"
• Tools -> Processor: "ATmega328 (3.3V, 8MHz)"
• Tools -> Port: (USB port to which the programmer is attached)

Baud-rates:

• reading from MoleNet node: 1200 Baud (don't change!!!)
• reading from MoleNet simple Gateway: 115200 Baud
• setting the RTC: 9600 Baud (could also be changed)

Data Format (simple Gateway)

The app just listens for packets and print the payload with correct formatting The data format is as follows:

#[PACKETNUMBER][NODEID] 'D'YEAR/MONTH/DAY 't'HOUR:MINUTE 'W'VWCRAWVALUE 'T'TEMPRAWVALUE CHECKSUM SUCCESSINDICATOR   ['RX_RSSI:'VALUE] - 'ACK sent.'

example:

#[2][2] D16/3/30 t15:36 W0468 T0594 68 1    [RX_RSSI:-28] - ACK sent.

Set the RTC time (Set_RTC)

The program prints current time of RTC to serial port every second. The time can be changed by sending the new value using the serial line and terminate it with a carriage return. Possible commands are:

• y : change the year, enter full year (e.g., 2016)
• M : change the month
• d : change the day
• h : change the hour
• m : change the minute
• s : change the second
• w : change the weekday (0: Monday, 1: Tuesday...)

Manually trigger a measurement

Pull pin Int1 at the RTC to ground. One tip is enough

wusn's Issues

MoleNetv6: Arduino testing

Test the following things:

• Upload
• Blinking
• Debug output
• RTC
• SD-card
• SDI-12
• LoRa
• Low power / wakeup

Micropython: Is the SD-Card working?

Add an BME280?

Does it make sense to add an BME280 (temp, hum, pressure) to the board:

• high quality and low power sensor
• good to monitor the inside conditions of the board
• Easy start with some hardware directly attached to the board

What do you think @B00mb0x @FarukKollar @Wolfestin123 ? Alternative ideas?

Check SDI-12 interface

Depending on the SDI-12 sensor, the power consumption increases drastically. Check and fix

Replace data string by struct

Should solve several issues for example with month with numbers longer than one char (Oct, Nov, Dec)

Improvement of success code: always 1, convert success code to int

The received success code is always 1 but should be different in case of a successful transmission, c.f.

WUSN/sources/MoleNet_1.0/MoleNet_node/MoleNet_node.ino

Line 143 in 66d6b34

//suc : success indicator

//suc == '0' : crc-check and transmission failed
//suc == '1' : crc-check successful, but transmission failed
//suc == '2' : crc-check failed, transmission successful
//suc == '3' : crc-check and transmission successful

furthermore, the success code is handles as a char, not as an int.

replace SPIEEP

The node lib for accessing the EEPROM uses an old version which is not supported / available any more. Replace this lib by a newer one.

Arduino: Is the LoRa-Transceiver working?

Micropython: Is the LoRa-Transceiver working?

Arduino: Is the RTC working?

Low power / wakeup

Add RSSI of received packet to the forwarded packet at the basestation

Currently, the base station only gets the data. For better node placement, the RSSI value would also be helpful.

Micropython: Is the RTC working?

I think @B00mb0x already did it. Can you confirm and maybe close?

Micropython: Check the RTCs (LED etc.)

Packets not sent in order / packets missing

Data packets are not properly resent after being stored in die EEPROM:

Solution: implement a proper ring buffer

Arduino: Check the RTCs (LED etc.)

One SPI for LoRa and SD?

Right now, we use two SPI for the SD and the LoRa. Is it possible to use a shared SPI? Please evaluate:

• Any drawbacks regarding performance?
• SPI speed compatible?
• Other restrictions?

Maybe we can combine MOSI, MISO, SCK of both and get three additional pins for the next board?

Arduino: Is the SD-Card working?

MoleNet Microypthon testing

Test the following things:

• Upload
• Blinking
• Debug output
• RTC
• SD-card
• SDI-12
• LoRa
• #19

Pullup in SD_CLK -> not in reference design

There is a Pullup in the SD-card clock signal which should not be the case according to the reference design ("do not populate").
Remove and test SD-connectivity.

Handle temporary gateway failures.

If the gateway is not available for a certain period of time, the data should be stored and sent later.