Project Objective: Develop an open source AIS Alarm that alerts sailors that a new marine vessel with AIS is within range


Two boards have been populated and tested now and everything seems to be working.  This update will cover thoughts on the PCB, faceplate design for the enclosure, and an update on the firmware.


I am satisfied with the PCB for the most part now but will decrease the drill hole size for the LED as the fit is a little loose.  Three different buzzers were tested and while all were satisfactory the one with the highest pitch seemed the most annoying and so that is the one I will use.


Here is the design for the enclosure face plate:

AIS Alarm Enclosure Face Plate

I had an extra dAISy blank plate for the enclosure and made a prototype with my drill press to make sure the dimensions were correct.  The plates will be fabricated by the PCB manufacturer.


The firmware features have now been tested individually but not completely integrated.  My chosen process is to add features one at a time and test before moving on.


Next up:

  • Order faceplates, parts, and PCBs for a run of 10 or so boards
  • Continue work on firmware


Past Posts from this Project:

AIS Alarm

AIS Alarm - The Process

AIS Alarm - Prototype Hardware

AIS Alarm - Timers and GPIO

AIS Alarm - Prototype Code Outline

AIS Alarm - UART

AIS Alarm - First AIS Messages

AIS Alarm - First FRAM Storage

AIS Alarm - Debouncing Momentary Button Switches

AIS Alarm - FRAM Ring Buffer

AIS Alarm - Schematic

AIS Alarm - PCB Version 0.1

AIS Alarm - PCB Version 0.1 Arrived

AIS Alarm - PCB Version 0.2

AIS Alarm - PCB Version 0.2 Populated


References and Links:

WEGMATT LLC - dAISy AIS Receiver - low cost AIS receiver

Texas Instruments MSP430FR2xx FRAM Microcontrollers - Post No. 4

TI MSP430FR2111

Maximize the Sound from a Buzzer