t vago's MPGuino workspace thread

[H-Man]

The trick is to flash an empty sketch to the TinkerKit LCD. The timing is a bit tricky but it works well enough. When I have time I'll see if I can make cheap units using an ebay arduino nano, a cheap eBay LCD, and a postage stamp of PCB for the BJT, zeners, and resistors. It looks like the minimum BOM is $8 without case.

[H-Man]

Is there any reason I wouldn't be able to add some code to do an analog read of my dashboard lamp rheostat voltage and have the micro controller adjust PWM based on dashboard brightness?

[t vago]

Originally Posted by H-Man

Is there any reason I wouldn't be able to add some code to do an analog read of my dashboard lamp rheostat voltage and have the micro controller adjust PWM based on dashboard brightness?

Hardware-wise, you'd have to add a voltage divider to condition your instrument panel lighting signal to be less than 5VDC, then feed it to one of the analog input pins. You'd want to also add a 5 VDC Zener diode to the pin for circuit protection. The circuit would look similar to this:



The resistor values would have to be adjusted, but that should be easy enough to do.

Software/Arduino-wise, this capability could easily enough be added in. My code already has analog input reading capability built into it - not sure if the original DCB 0.86 (or earlier) code would allow/accept Analog library calls. I'd just have to provision in a way of assigning an unused analog pin for use with brightness.

I got the analog gauge driver code added in, but haven't been able to find any time to test it.

[t vago]

Well, then... I guess I can no longer edit the first post of this thread!

Time to start another workspace thread!

[kep]

Thanks for your work done, but it does not work with nozzles, peak and hold, I found a sketch. It works, could you add this algorithm to your code?
As well as add voltmert
Excuse me writing serz translator

[pablitosax]

Hi t vago :

Interesting Project ...Have a shcematic for Arduino Mega ?

Regards !
Pablo.

[t vago]

There should be some description in the source code on what pins to connect for an Arduino Mega2560.

I have also started using GitHub -> https://github.com/tvago1972/MPGuino

[pablitosax]

Thank you very match ! :-)

Originally Posted by t vago

There should be some description in the source code on what pins to connect for an Arduino Mega2560.

I have also started using GitHub -> https://github.com/tvago1972/MPGuino

[Vitek]

Hi, I created my MPGuino, downloaded the software (different versions) and slightly modified, all right. I want to use it with a marine engine. I also want to use a 20x4 LCD. But I can't edit the code. I see random characters all over the screen. How difficult would it be to edit the code for a 20x4 LCD (HD44780), can you please advise me? I'm getting started with programming. Sorry about my English. Thank you very much. Vítek

[FlashStopFall]

Alright, I'm a bit lost. I built an mpguino using the legacy schematic with a Nano. I don't have the LCD yet, it comes tomorrow, but it appears to be working. Only thing is I tried to enable serial debugging so I could see some output on the arduino IDE serial monitor, but it never outputs anything. Is there a #define that I''m missing?