ABoatMon

An Arduno clone based (hence the A) Boat Monitoring solution!

Intro

A reimplementation, and extension of https://github.com/gregcope/piboatmon, as the original consumed too much power. This is designed with the following goals;

• Be very, very low power and
• Monitor and charge from 12-24V

The present version is made from COTS parts to make life easy at the deign/proto stage. However the code should be transferable.

Parts

• Adafruit Ultimate GPS - any 3.3v UART GPS would do, however needs an enable pin and vbat GPS almanac backup
• Adafruit Fona - any 3.3v UART GSM modem would do, although we do use the battery charging on the fona
• Low power Atemega 1280 Moteino Mega This might fit into lower spec Atmegs, but I have no idea... The Moteino M0 would work well, although pin outs need to change.
• Mini Step Down Regulator Voltag Power Supply Module 4.5v~55v to 5v. Specifically the one with an enable pin and low power in off mode (<10ua). Needs to supply 500ma+ (600ma is fine) and deal with 11-30v on the input to work on 12V or 24V systems. Needs to supply 5V for the lipo charger. Efficiency is not a massive issue as the regulator is off most of the time, only on to charge occassionally.
• DS18B20 Waterproof Digital Probe Temperature Sensor with Silicone Cable (higher temp) Thermometer
• 12V 12mm LED Power Push Button Switch Momentary Waterproof Metal 4 Pin
• 1200mah LIPO Battery (any single cell LIPO with a JST would do)
• Bilge Switch (any normally closed, simple switch would do)

External Libs

• Tinygps++ - A class to deal with GPS
• Lowpower - A class to help with Sleep modes
• Eeprom - Save Eeprom state
• OneWire - DS18B20 Temp sensor lib

Internal Classes

• Config - A class to provide a config object to store Eeprom state
• CRC8 - CRC checksum (for config saving)
• Sleep - Simple wrapper to LowPower sleep
• Buton - A simple button monitor
• Fona - Drive a fona to send data
• Gps - Drive a GPS and feed a TinyGPS++ object with other helper methods
• Led - A simple LED driver
• Lipo - A class to ADC a Lipo value
• Temp - A class with simple, non-sleeping temp measurements
• Vcc - A class to ADC the VCC, as well as enable/disable a regulartor (that drives the 5v Lipo charger)

High Level Logic

• Switches is on setup configures all the required parts
• Loop every 8 secs and checks;
  • Start the temp conversion
  • Lipo volts
  • VCC (and enable regulator if Vcc > 13 and switch off if low)
  • Bilge switch
  • read temp (blocks)
• Every Hour;
  • Checks the above
  • Checks location
• If out of band, send a message as an alarm
• Daily
  • Send a message

VCC logic - Sacrifical Charging

The idea is that if VCC is 13v plus then a charge source is on and we can hence enable the regulator. If the VCC is above REG_ON_VOLTS (13v) enable the regulator to start the LIPO charger. If below REG_OFF_VOLTS (12.8) stop regulator

Message Sending

To save possible expensive bandwidth the message is compressed. Ideally it would be JSON. However it is optimised for speed and bandwidth costs. It needs to be parsed on arrival.

HowTo

1. Open a command terminal, and change cd to where your Ardunio IDE stores code cd Documents/Arduino
2. Clone the repo git clone https://github.com/gregcope/ABoatMon.git
3. Open Ardunio IDE and open ABoatMon.ino

http://arduino.stackexchange.com/questions/348/how-to-organize-my-arduino-projects-structure-for-easy-source-control