astuder/daisy

Simple AIS Receiver based on Si4362 and MSP430

daisy's Issues

Rework preamble/sync detection

• Look at CCA (Channel Clear Assessment) and reset state machine when signal falls below threshold
• Improve transition from preamble to sync, current implementation simply waits for x bits for sync after valid preamble, ignoring invalid bits inbetween

LoRa GPS dinghy tracker

2 devices:

One: waterproof LoRa transmitter with GPS and some MCU, waterproof and solar charged

Second: Cabin LoRa receiver with MCU producing AIS NMEA sentences for each dinghy location via USB serial or WiFi.

Boat can have several dinghies so several transmitters would be needed.

This can be really cost effective solution compared to other asset tracking 4G/LTE/satellite

Instead of dinghy if transmitter is built-in into sailor's clothes (colar) it can be even safety feature. Solar panels can be epaulettes sewn into sailor's jacket.

Just an idea

Radio stops to receive data

Sometimes RX CLK and DATA stop. With some radio configurations this happens more often than others. Not reproducible.

Enable watchdog timer and reset as preventive measure?

NMEA electronic compass idea

Some MCU with IMU producing NMEA heading, pitch, roll, etc via serial USB
with high baud rate.
Could be used as input for autopilots.

Might be with added barograph, humidity, air quality, temp

Just an idea

[ASK] Downloading firmware into new MCU

Hi Adrian,
My name is Handiko. I want to make your dAISy hardware on my own. I have read in your https://github.com/astuder/dAISy/tree/master/Firmware that to download the firmware, as I understand, the MCU needs to be flashed with the bootloader first. Is that true? If I want to make my own PCB and solder my new MSP430F5502 MCU, can I just use the Daisy_hw4_fw4_15.txt file? Do I still need the bootloader? Any info will be very much appreciated. Thank you and great project!

raspberry CM4 IO board design idea

raspberry CM4 and IO boards look very promising. I thought since you made dAISy you might be able to design a more complete board.

https://www.raspberrypi.org/products/compute-module-4-io-board/

There is a company which offers free design of the board on their web site
if you use their web site to spec it out.

Here is the link

https://www.gumstix.com/community/special-offer/

Their design studio

https://geppetto.gumstix.com/#!/dashboard/

Add number of NMEA interfaces, GPS, IMU, few 1-wire, One N2K
Safe Shutdown, 12v power in (+ AIS Chip possiblly)

to original CM4 IO Board and it could make a nice marine board
replacing MCS and Moitessier Hat combo

using raspberry CM4.

Just an idea

Thanks,
--MG

Move radio control into packet handler ISR

To let the receive logic run independent of the main thread, move radio control for channel hopping and RSSI read-out inside packet handler ISR.

No radio functionality should be called while packet handler is running (i.e. before calling ph_stop()).

uart_send_string() problem

Hello Astuder!
I have one question about send string over uart. In main.c we can see:

uart_send_string("dAISy 0.2 started\r\n");

after radio_get_chip_status().
If I unplugged the dAISy receiver, I could see blinking led that indicate the error of radio_get_chip_status().
But if I plugged the dAISy I couldn't find 'dAISy 0.2 started' printed in my serial terminal.
How could it happen?
Sorry for the noobs question.

Regards,
Rian

NavTex USB idea

Based on success of dAISy AIS might be you could make
a small NavTex receiver connectable
via USB. And outside antenna. There is one NASA Marine PC NavTex USB
which is way too expensive.
There is software too to display messages https://github.com/juerec/pc-navtex

thanks,
—MG

NRZI encoding

Hi

I'm trying to replicate some of your work here, but I cannot figure out how to interpret the usage of NRZI in AIS. The wikipedia article on AIS signals indicate that only the payload is NRZI encoded, if this is wrong, please let me know so we can get that corrected...

Best Regards

Lightning strike detector idea

There is a board like this
https://www.sparkfun.com/products/15441

I think it could be useful device it can be made a marine grade USB connectable device.

Or NMEA 0183 with some kind of custom NMEA sentence which other software can adopt.

Thanks

Make serial communication asynchronous

Currently, sending of data over serial is blocking the main thread. The result is, that in case of a channel hop request, the packet handler state machine is blocked until the current serial transmission is complete. (solve by moving hop logic inside packet handler ISR)

Implement serial TX as ISR, add isBusy() to UART that needs to be checked before reusing TX buffer.

Implement Channel Hopping

Use Si4362 support for channel hopping to alternate between both AIS channels. Could be based on signal strength (RSSI) or preamble timeout.

Error when Importing dAISy AIS Project in CCS v6

Hello Astuder,
Thanks for sharing the codes. When I imported the codes in CCS v6 I got this error:

Error: Import failed for project 'dAISy' because its meta-data cannot be interpreted. Please contact support.

Any solution?
Thanks.

Salam,
Nazmi