How to disable reset button?

[espruino-discuss3]

Posted at 2015-11-19 by CoffeeCups

I've searched everywhere and cannot find a solution to this.

I have someone in the real world testing an Espruino with a sensor and logging. Its only a second stage prototype and at this stage I don't want to add an RTC, so the time is hard coded as the prog is save()d when init is run.

I have programmed BTN1 to allow them to unmountSD, but am scared that they will press reset, and send the time back to the hard-coded one I just mentioned.

I thought I'd found the answer on this thread with var reset=0; but it does not work.

How can I disable, or redirect a button press on the Reset button?

I read this on the Adafruit description :

Solder jumped so you can turn the reset button into a second general
purpose button

But am unsure how to do that. It seems a bit drastic, but I will do/undo it if necessary.

Thanks for any ideas - loving my Espruinos by the way, great project.

Espruino 1.4 with 1v81.

[espruino-discuss3]

Posted at 2015-11-19 by @gfwilliams

Thanks! The reset button is physically connected to the reset pin of the board, so it can't be overwritten in software, but you have two options.

Use the internal RTC

This is actually what you're doing currently, and the internal RTC will keep time between resets.

The problem is that the RTC is only 24 bit, and when you use the set time option in the Web IDE it sets the time since 1970, which is too big for 24 bits... So when you reset only the bottom 24 bits are left (there's a bug open for this at the moment) and the time is wrong.

To get around it, you can turn off that setting in the Web IDE and can instead store the time since startup (the default) and then add that to a variable that you create which is the time at which you started Espruino. The http://www.espruino.com/clock module will do that for you.

Disable the hard reset button

You might want to do this anyway, as if you're writing to an SD and just hit reset, it could corrupt it.

It's pretty easy - if you look at the Revision 1.4 layout at http://www.espruino.com/EspruinoBoard you'll see something marked #3.

See the attached image - just cut across with a sharp blade where I made the red mark reset will stop working.

If you want to re-enable it, just put a blob of solder between those two pads. You can also put a blob of solder on the two pads to the left, and then you can use that extra button on pin C12 (but you need to either add a resistor or run pinMode(C12,"input_pullup") to make it work correctly).

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Attachments:

• rst_cut.jpg

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Posted at 2015-11-19 by CoffeeCups

Yup, that scalpel cut did it. Nice to know how to reuse or re-purpose reset button too.

Me searching for RST instead of 'reset' might have yielded the find.

Thanks for the nice fast reply and saving me from the very nasty alternative I was dreaming up involving hot-glue and an old led cover.

My comments re RTC were because I can see them removing the battery too, sticking a charger in the project should negate that. Reset maintains clock, good to know.

Cheers

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Posted at 2015-11-19 by @gfwilliams

Ok, great!

You know there's space for a LiPo charger IC on the board too? Just take a MAX1551 and solder it on, then as long as you have a LiPo battery, when they plug the board into USB it'll get charged :)

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Posted at 2015-11-19 by CoffeeCups

No I did not know that, I will look further into it.

Third stage prototype will involve 2 units one to sensor and transmit (Pico), the other to receive and log.

I really wanted to cut my teeth on straight Espruino standard boards first. Looking at both BT and RF units right next. Your site has some really good info on fixing these in, I like the videos.