Thinking of a new gadget...

[Csory_imp]

And now a few pictures and videos... First, please be advised that it is still a "Franken-gadget". It has a programming cable that will not be there in the final version, the lower "brain" module is about 2x larger than the final one will be, and the surface quality of the housing is just plain bad (didn't want to fiddle too much until the electronics are ready). Display module is a wee bit misaligned too. However, what it does (in terms of functionality) is pretty much finalized.

The first image shows the gadget spread out, sans the wiring coming from the engine oil temp sensor and the battery. (I have spliced into the EOT sensor cable to utilize the built-in NTC sensor). Center-left the black thingy is the "brain", center-top the display, logner wire connects to battery/EOT sensor, shorter wire contains the air temp sensor and ends in the "keyboard" connector.



As it is seen from the driver's seat:



Brain module, tucked underneath the center console. Flat ribbon cable seemed like a good idea, but in the end might go with a round cable or phone cable instead.



This is the rotary encoder, to be connected to the short "stub" cable. Once connected, the gadget goes into "setup" mode and can be thoroughly adjusted. More on that later.



This is the connector cable of the gadget, fished out from its tucked position, ready to be connected to the encoder.



...videos coming...



Some technical details (most of these are also tagged in the video):

- Fahrenheit and Celsius units are user-selectable.

- Display backlight level and contrast can be adjusted.

- U ECU is the source voltage of the ECU used on NTC sensors (default is 5V), R ECU is the pull-up resistor (default is 470 Ohms). Both can be adjusted.

- There are two channels, one for the oil temp sensor, one for the coolant temp sensor (on liquid-cooled engines). This prototype only uses the oil temp sensor (what else on a CB?!). Should anyone like to use the gadget on a different bike (or - rather a bike with a different sensor type) can select "custom" sensor type for either (or both) of these.

- Custom sensors are calibrated via two-point beta algorithm. (1) let the engine cool down completely, and set "T1" value of the corresponding sensor. This temperature should be pretty much the same as air temperature. (2) Let the engine warm up completely, and set "T2" value of the sensor - for example, by using a non-contact thermometer to get a reading on the sensor housing.

- standard (Bosch) sensors use the factory table to set Steinhart-Hart coefficients. Theoretically it is more precise than custom sensors beta method, but both should be more than adequate.

Every setting is persistent (i.e. saved in non-volatile memory).

Hope you find the video worth watching, and thanks for reading my ramblings!