EVSE with arduino - code

[Nuno S Silva]

Hi all,

The group absolute "rocks"...

I'm finishing doing the EVSE with arduino...

Using:

1x Arduino Uno

2x Protoshield (GFCI and OpAmp Pilot)

1x LCD keypad (not Adafruit)

A couple of things that are happening right now:

1 - as I'm using the USB port for power, when I insert the GFCI protoshield, the Arduino "breaks". By "breaks" I mean shuts down. if I put Arduino+Protoshield pilot+LCD -> no "shutdown". No current sufficient from USB port?!

2 - As I'm using a LCD keypad I've tried to use the LiquidCrystal library in order to view the messages..."No can do"! It only "shows" the top row of the LCD. Tried to use lcd.begin(16,2) and lcd.setcursor...no luck. The best I get was the 2 rows powered but blank... I've putted the code attached (basically is the one on the forum and the adafruit example code with some changes...

For instance: Right now shows "Vent Required" on the top row, but, as I could understand on the code this message should be in the bottom row and on the top should presente "EVSE Error"...

Did someone used LiquidCrystal library successfully with Arduino?

3 - Testing mode: What about the CT? can the system be tested (with the diodes+resists) and "discard" the CT?

I think I need first to put the LCD working first. Can I get a little help? Maybe the code merging of the Adafruit and LiquidCrystal is screwing up...

Thanks in advance

[lincomatic]

I’m guessing that your LCD is using pins that the EVSE also uses. If it works w/o the other shields hooked up, then that’s the culprit.

 

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[Nuno S Silva]

Hi lincomatic, thanks for your reply

The pins I use for config the lcd are lcd(8, 9, 4, 5, 6, 7)...  

[Nuno S Silva]

Just after send my reply I've confirmed...

Indeed I'm using common pin...at least D5 and D2

Can i get some help in how to correctly initialize the lcd?

[lincomatic]

You can’t share the pins that the EVSE uses. Look through the code for the defines with “PIN” in them.

If you have all features enabled, then these pins are already taken: A1, A3,D3,D4,D5,D7,D8,D10,D13.

 

That’s why everyone else is using an I2C connections for their LCD’s… only 2 I/O pins used.

[Nuno Santos Silva]

Thanks lincomatic,

You are right.

I’ve managed to get a lcd 1602A (plain simple, no buttons)! Can I use the I2C connections? Nevertheless, the code should be changed to meet these I2C spec, no?

 

Thanks (again and again)

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[lincomatic]

I don’t know without a spec sheet, but that sounds like a typical HD44780-compatible parallel interface LCD.  You can hook up an HD44870-compatible to Adafruit’s I2C backpack: http://www.adafruit.com/products/292 and enable I2CLCD in the code, or use an Adafruit RGB LCD-compatible http://www.adafruit.com/products/714 by turning on RGBLCD.

[Nuno S Silva]

Ok, almost there...

actions taken: no use the gfci module...baby steps :)

first "bad thing": when connected led goes allways blue. :(

attached a diode+resistor in order to get the charging state...pilot read -6v (?!) and output relay ok...

If not coonected: pilot read 12V, green led...nothing

just to clarify...I'm using fw 0.4 (because it has the pde/ino file). isn't there a new one "editable". my guess is that I might need to clear // some code parts and as far as I have been seeing, #define gfci does not exist in my code, as well as advpwr...

So, I might been dealing with a code problem rather than a physical on. Can I get a "newer" code version not precompiled?

Thanks guys!

[conradel...@gmail.com]

Are you using this one https://github.com/lincomatic/open_evse I have read through the entire thing multiple times and as far as I can tell it is complete for the 4.2 Version build.

[Nuno S Silva]

Actually no.

I'm using this one :https://code.google.com/p/open-evse/downloads/detail?name=open_evse_fw_v0.4.0.zip.zip&can=2&q=#makechanges

Apparently has nothing to do with my current version (0.4.0)

Do you have any ideia if it is Arduino compliable?

[conradel...@gmail.com]

Open Mouth Remove foot.  Well thats what I get for answering a question without reading the entire back post.  I didn't notice that you were building the Arduino Shield version,  now I have a limited knowledge of coding but I don't see why this wouldn't work with the Uno.  You shouldn't need the Arduino includes since they will be automatically included with the uno's bootloader.  I may have over stepped my knowledge a bit by answering your question Sorry.

[Chris]

Current Stable Source code is here:

https://github.com/lincomatic/open_evse

Beta Code is here:
https://github.com/lincomatic/open_evse/tree/development
 

[Chris]

Do you have any ideia if it is Arduino compliable?

Yes, the code is designed for the Atmel 328p which is the same microprocessor as the Arduino Uno.

[Nuno S Silva]

Thanks Chris and Conrad

About this current stable version, and since I will be doing, for now, the Pilot Opamp module and the Arduino itself, giving the info that this is also kinda new to me... I think, as lincomatic once told me, I should "//" the #define advpwr and the  what else? #define GFI? 

Thank you