First of all, a few important notes that you should definitely pay attention to.
- Retrofitting for all motor types, as independent sensors are used
- Use of cheap sensors
- Measurements of various engine parameters
- Flow rate cooling water (impulse, YF-S201B)
- Temperature cooling circuits (1Wire, DS18B20)
- Engine compartment temperature (1Wire, DS18B20)
- Engine RPM (Pulse, GP2A26 Sharp)
- Output Shaft Speed (Pulse, GP2A26 Sharp)
- Tank level via pressure sensor
- Engine operating hours (via speed detection)
- Power supply via 12V on-board network
- Data processing with ESP8266
- Data transfer via WLAN
- Data protocol NMEA0183, partly with customer-specific telegrams
- Data display via OpenPlotter
- Simple web front end for operation and display via mobile phone
- Waterproof case
- Installation location in the engine compartment for short cables
- All sensors connected by cable
- Price less than 120 euros for material
- Current Circuit diagram
- Board is with Aisler orderable
- Current software: Source code, Binary file
https://www.segeln-forum.de/thread/71890-motormanagement-diy/
Electronics box
Electronics box prototype
Speed sensor with light barrier
Flow sensor
Measured values in OpenPlotter
Engine speed sensor on pulley
Flow sensor sea water circuit with Gardena couplings for quick bridging
Speed measurement shaft exit
Board layout by Hans-Jürgen
Assembled board