One for the Electronics geeks !! tacho to plotter readout

[KompetentKrew]

I imagine you could do this with the Hat Labs ESP32.

They have a tutorial for making an NMEA 2000 engine temperature sensor: 1-Wire temperature sensing

They used to sell a complete kit for building the engine temperature sensor - I don't see it on the site, but you could email them.

You would need to adapt the circuit / code to add the tacho sensing.

 

[Ceirwan]

There is a relatively inexpensive Chinese box of tricks that converts analogue data to N2K. Does two engines and several other devices. I have one here, looks OK but not had a chance to try it. I've also got the £400 ish Actisense, not had chance to fit that either.

This is the one i have,seen them on Ebay too : https://www.aliexpress.com/item/100....order_list.order_list_main.41.1a611802IQQWtT

If it works, that's an incredible price.
I can't believe it even comes with a Micro-C port, normally the cheap stuff makes you wire it in directly.

 

[Refueler]

This is gutting 'interesting' ... even if not thinking to integrate to a MFD etc. - its working out as not so hard or expensive to sort .... just wondering what possibilities open up ??

 

[GHA]

Checkout "Boating with the Baileys" on youtube for the DIY solution. It's quite technical though and ends up requiring an octocoupler feeding an ESP32 chip which sends the data to a raspberry pi running openplotter/signalk. A lot of work and probably not worth it unless you have more uses for the data than just looking at it on an MFD.

Here >

That was actually my circuit! Well it wasn't, copied off the web and I haven't even got it wired in yet so it was great to see that it works. There's another guy on youtube copied it from BoatingBaileys so rock on opensource!!!
As there's so much data logging going on it just ended up easier using an esp32, probably could do it fairly easy just using a Pi gpio pin, get the data in there and signalk can do anything you could realistically want to do with it.

You can get the PCB's made online cheap with all the surface mount parts already soldered on for anyone interested. (bet no one does )
RPM circuit is around B4 just right of centre.

GitHub - boatybits/boatymonpy

 

[mairas]

I imagine you could do this with the Hat Labs ESP32.

They used to sell a complete kit for building the engine temperature sensor - I don't see it on the site, but you could email them.

I am finishing the design of a new improved device for engine and tank sensing: HALMET (Hat Labs Marine Engine/Tank board). It should greatly simplify constructing such sensors.

ETA of the board is around New Year.

 

[KompetentKrew]

I am finishing the design of a new improved device for engine and tank sensing: HALMET (Hat Labs Marine Engine/Tank board). It should greatly simplify constructing such sensors.

Pleased to heart that. Can you summarise the improvements?

 

[mairas]

Pleased to heart that. Can you summarise the improvements?

Now that everything will be on a single board, you don't have to purchase two separate devices. The connectors are much better: due to size constraints, the Engine Hat had only 2.54 mm header rows for the digital and analog inputs while HALMET uses pluggable screw terminals. The galvanic isolation gap is now between the inputs and the main board, meaning that you can power the device safely using the N2K bus. The digital and analog input section protection has been improved. At least those changes come to my mind.