When printing the template, pay attention that it isn’t scaled. Due to the number of holes required, I prepared a printable drill template that can be taped on the enclosure. The enclosure needs to have holes drilled for the different connectors. In this tutorial, I’ll instead use separate connectors to allow for a more flexible installation. Removing the SH-ESP32 for modifications or debugging is difficult because the connections are permanent. This approach works fine but is cumbersome for maintenance. I have previously had a similar setup where I spliced individual sensors together outside of the enclosure and routed them into the enclosure through a cable gland.
OLED display (optional) Hardware assembly.NMEA 2000 male panel connector – if you want to connect the device to an NMEA 2000 network otherwise it’s Signal K only.SP13 connectors, 3-pin, male plug – as many as you want external sensors.1-Wire temperature sensor – as many as you need.To complete this tutorial, you need the following parts: If you have any suggestions, corrections, improvement ideas, or other feedback about this tutorial, I’d love to hear about them at Parts needed The end result of this tutorial is this neat little device that measures three different temperatures and is able to output them both wirelessly using the Signal K protocol and over NMEA 2000. One SH-ESP32 can support as many temperature sensors as can be practically connected to it. I have had a similar setup for several years and it gives me an extra peace of mind: I would get an early alarm if the temperature would begin to rise (I’ve had coolant issues in the past), and also if I ever would forget to open the water intake seacock, I would get an alarm of rising exhaust temperature before anything irreversible could happen.
My own engine is a Yanmar 3GM30F but the approach is completely generic and can be adapted to any engine. This tutorial will walk you through creating a temperature sensing device that can be used for example to measure engine oil, coolant, and wet exhaust temperatures of of any engine that doesn’t already report these temperatures to Signal K or your N2K network. 1-Wire temperature sensing Table of contents
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