Hello,
I am working on small car data logger module for pressure and temperature sensors. Initially, I'll use an Uno R3 that I have spare, but will upgrade to a Mega as and when it is needed.
I have a couple of questions regarding hardware:
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Is there a cheap 16x4 LCD screen (rather than 16X02) that you can recommend, particularly that's bright enough for use on a dash board in a car.
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Is there a library for standard automotive pressure sensors (particularly Intake Manifold / MAP) that would be suitable along with their linearisation info?
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Same as question 2 for pressure sensors?
Thanks,
Owen
Displaying data in a car is difficult. If for example the sun is shining into the LCD there is no LCD in the world that will be possible to read. Then some shadowing arrangement will be needed.
I have bought a number of 4x20 LCD from Ebay. I like the I2C communicating LCDs because they only uses 2 output pins, A4&A5.
Thanks for the feedback.
I think we'll look to install with some kind of shade or enclosure. I had the same concern.
For the screen do you have a link?
This is the eBay item number I was looking at that.
153372060863
I tried hard to provide You a link but it didn't work out. Search for LCD, 4x20, I2C on the Ebay.
No probs, I think I've found the one.
Thanks!
Good! Go on testing. I used 7 segment red LED displays for 10 years and they worked fine but not always. LCD, smartphones, they all have their limitation regarding visibilty in bright environments.
I do have a spare tm6138 now I think about it. I'll order the screen and see how it goes
Good luck! No other obvious problems I can think of.
OwenMorris92:
2. Is there a library for standard automotive pressure sensors (particularly Intake Manifold / MAP) that would be suitable along with their linearisation info?
If you get an OBD scanner (ELM327), you can connect to it via bluetooth/UART and query the MAP PID to get the data. Below is a pic of the MAP Service ID, PID, and how to interpret the returned data:
Pic Source
