Thanks, looks a bit less home made in this latest case 

Jon Wildsmith said:I made some inquiries about water level sensors that go in the main cooling system rather than the expansion bottle but never heard anything back about those so still looking for solutions to detect coolant loss.
I should also have said that none of the 'features' will get upset if you don't connect the wires for them e.g. if you don't need the speed / trip meter functionality don't connect the speed sensor input or output, simplesJon Wildsmith said:Just had a read back through the thread and though I'd recap what this thing does in case it's got a bit lost in all the posts
You can keep time accurately enough for average speed calculations using the Arduino RTC. Average speeds are mostly working but I never got round to deciding how / where to display them but will pull my finger out nowJim Andrews said:One of the features I'm interested in, is an average speed readout for travelling through the SPECS speed camera areas. I'm assuming the Arduino has an RTC, so given that it knows about distance from the speed sensor it should be easy to do an average speed. Thinking it could just be reset by a touch of the screen, no actual settings required.
There are two methods of calibration at the moment - 1) drive for a while and then tell it how far you've gone or 2) enter a known value presumably from a previous drive calibration, the current value is displayed to be edited so you can tweak a value if you've done an approximate distance. Adding another mode is only really a case of thinking of a UI design / sequence that makes sense. Using method 1) over a longer distance with your GPS providing distance traveled should be accurate enough for most purposes. I did mine by measuring 180.2 meters with a measuring wheel, which was the distance from a lamp post at one end of the road I live in to the curb at the other, drove it and then entered 180.2Jim Andrews said:Also how are you doing the speed calibration?
It can store 2 calibration values and it takes 2 taps on the screen to switch between them. The speed display indicates which calibration you are using. If 2 were deemed inadequate it would be easy to add more!Jim Andrews said:I have sets of different size tyres (as we all do!), so having a calibration mode and ability to store & select different tyre settings would be useful.
That is the battery linking modeJim Andrews said:Is the "Auto" display (centre-right) to do with the gears? The gearstick in the photos looks like an auto, so is this selector position?
I hope you don't mind me quoting some of your PM here Jim but you never know someone else might find the answers useful
The box the Arduino is mounted in came from coolcomponents - here - but if you mean the case the screen is in I'm afraid it was a carry case for another gadget so is a one off. The Arduino and the screen don't have to be in separate cases, you could make a single unit, conversely they can be much further apart than I have them.Jim Andrews said:Think I'll be ordering some hardware, where did your neat mounting box come from?
Yes, it's a common ldr. If you didn't want to do that it could be configured to use a feed from the dash lights to dim it which would be simpler and might be what I should have done but the ldr works.Jim Andrews said:Take it the sensor on the front of the box is for low-light dimming?
Jon Wildsmith said:just because I don't have a cruiser at the moment![]()
Beware, big brother is watching you!Jon Wildsmith said:Can't rule out getting bored with speed
From previous personal experience it only takes about 12 weeks for high speed to feel normalJon Wildsmith said:I still like cruisers, I just don't know what I'd do with one at the moment. Can't rule out getting bored with speed again and getting another cruiser at some point![]()