Comments on: Button Code – Single Button Code Entry System

By: Garage Door Code Opener - Hacked Gadgets - DIY Tech Blog

Garage Door Code Opener - Hacked Gadgets - DIY Tech Blog — Wed, 04 Aug 2010 04:19:58 +0000

[...] Many of us know Mike from his work at Hack a Day. I am honored that this design was inspired by my Button Code project! The project is based around a ATtiny13 microcontroller just because that is what he had laying [...]

By: Electronics-Lab.com Blog » Blog Archive » Garage door code button

Electronics-Lab.com Blog » Blog Archive » Garage door code button — Tue, 03 Aug 2010 10:43:23 +0000

[...] is written in Basic. The inspiration for this project came from Alan Parekh’s project (called Button Code). The four digit code is entered using one button. First digit is entered then wait for the led to [...]

By: Doorbell combo lock can open your garage door - Hack a Day

Doorbell combo lock can open your garage door - Hack a Day — Mon, 02 Aug 2010 13:04:05 +0000

[...] a combination lock that opens the garage door. The idea isn’t original, it is based on [Alan Parekh's] button code project, but I did develop my own hardware and software. A four digit code is entered by pressing the [...]

By: Garage door code button « odyssey through technology

Garage door code button « odyssey through technology — Mon, 02 Aug 2010 04:09:31 +0000

[...] single button code lock for a garage door. I got the idea from Alan Parekh’s project (called Button Code) and decided to build by own based around an ATtiny13 microcontroller. Join me after the break for [...]

By: Coded safety for diy laser - Hack a Day

Coded safety for diy laser - Hack a Day — Fri, 02 Jul 2010 17:03:54 +0000

[...] This would be hard to implement if you’re working on a watertight package but we like the fact that an unsuspecting house guest won’t go blind if searching for a flashlight during a storm. One last thing, the code entry system is PIC based which reminds us of [Alan Parekh's] one-button system. [...]

By: ferrix

ferrix — Tue, 11 May 2010 21:04:49 +0000

With one simple addition to its brain, this system could be used for utterly stealth front door entry control.

If the system detects a single “dumb” press-release, it could trigger a switch that is wired to the house’s doorbell ringer. Otherwise if it detects the correct code entry, it acts as a door lock release. This way, you can use the existing doorbell switch, not do any extra wiring, and have a completely* stealth code entry system.

* of course the door needs an electrically actuated lock release, so I guess it’s only MOSTLY stealth.

By: Stewart

Stewart — Thu, 14 Jan 2010 10:30:17 +0000

No problem Alan

Stewart

By: Alan Parekh

Alan Parekh — Wed, 13 Jan 2010 18:06:51 +0000

Hi Stewart,

Very true, I have never used a pin interrupt on this micro and I was just going by the pin out diagram that has only the B0 interrupt shown. But with a closer look at the data sheet you are correct the pins that it is connected to sure do have pin change interrupt capability on them.

When I revisit the code to add some additional featured I will have to look into that. Thanks for the heads up.

By: Stewart

Stewart — Wed, 13 Jan 2010 17:25:24 +0000

Hi Alan,
I was looking at the way the switch was connected. It is on PortB which has the capability of generating an interrupt on change on RB7RB4. Activity on any of those pins should be able to generate a wake up on interrupt activity.

I use this on RF units with small keypad which spend a lot of their time – just sitting idle.
The power required until you press a key is <100uA. It is the long term drain which kills alkaline batteries. I will try with a new PP3 and see how long that lasts.

Thanks for your help. As you say, I can always put a power switch in circuit…

Best regards
Stewart

By: Alan Parekh

Alan Parekh — Wed, 13 Jan 2010 16:48:04 +0000

Hi Stewart,

I just had a look at the code. There is a 1 ms pause in the main loop to slow things down a bit. I also tool a look at the nap and sleep functions of PICBasic Pro and the smallest low power time duration is 18 ms.

The switch is not on an interrupt pin either so that is not really an option. I am not sure how well it would work given the dual input/output function that the pins take on in this project.

One solution would be to drop your power to nothing by adding a toggle switch to kill power completely when not in use. This could be located next to the code entry button, worst case scenario a bad guy turns on the switch and draws 1mA until you notice.

I have never played with those batteries but after having a look at the specs they seem to pack quite the punch, with only a 1mA draw I would think they could run for quite some time. It will be the 100mA that the relay draws that will suck the life out of them…

Let us know how you make out!