Electric boat monitoring system

checking the presence of external 230VAC power supply connected to the boat when docked, and sending SMS to specified phone numbers if it disappears :

• if there is no external 230VAC power, batteries are not charging,
• if external 230VAC power is restored,
• battery voltage beyond lower or upper threshold limit for any battery pack,
• temperature beyond upper or lower threshold limit for any sensor (battery compartment temperature, cabin temperature, outside temperature, number of sensors expandable),
• determination of GPS position data,
• remote update capability via SMS sent from phone (setting data, operating logic, thresholds, etc...),
• Remote program update capability (from FTP storage),
• Saving measured data records to SERVER SQL database (max. 1023 bytes/send) :
• by uploading to FTP, or
• by HTML POST request.

• timestamp,
• presence of 230VAC (0-1),
• current battery voltage values,
• current temp. values,
• current GPS position.

• ESP32 WROOM32D processor,
• sensing of 230VAC voltage :
• without wire breaking with SN74LVC14, in a separate box, (or with 5V mains supply),
• measurement of battery pack(s) voltage (in 0 ... 70V range) with ESP32 calibration
• with refined 12-bit internal AD converter, with HC4051 multiplexer, (multiple voltage measurements),
• temperature measurements with DS18B20 1-wire temperature sensors, mounted with 1 and 5 m cables,
• SMS sending with SIMCOM7670E modem,
• GPS position with SIMCOM7670E modem.

• The ESP32 is in LIGHT SLEEP (program continuation and retention of ESP RTC data),
• the modem is in Rx SLEEP (wakes up on incoming call and wakes up the ESP32),
• the processor wakes up at adjustable intervals :
• measures voltages (sends SMS upon threshold crossing, max. 1 per day!),
• measures temperatures (sends SMS upon threshold crossing, max. 1 per day!),
• determines the presence of 230VAC, if the change was stable even after an adjustable number of wake-ups, it sends an SMS,
• if automatic program update was enabled, it connects to the FTP server at set intervals, and if there is a newer program version enabled for it (serial number, hardware version, software version match), it updates its own program.