Show Posts
Pages: 1 [2] 3 4
16  Using Arduino / Networking, Protocols, and Devices / Re: 433.92 Mhz garage gate opener on: January 25, 2014, 02:44:32 am
I'm quite sure it doesn't use rolling code, because it's 20 years old. Also, we have many clones of this remote controllers, one of these coupled to the receiver using 9 3-state pins.

EDIT: photo attached
17  Using Arduino / Networking, Protocols, and Devices / 433.92 Mhz garage gate opener on: January 24, 2014, 11:57:56 pm
Hi all!

I'm working on a project that has to be mounted on my motorcycle, and in this project i wanted to include a clone of the gate opener, so I don't have to take off my gloves every time to open the pocket and search for the remote controller.

I searched a lot on this forum and on Google, but every discussion I found didn't provide a solution to this problem, so now I want to open this discussion to find a definitive solution to this problem.

So here is the problem: I have this remote controller (attachment) that as I read, should work on 433.93Mhz, transmitting a code to the gate's receiver. I have to intercept this code from the remote controller I have, but I don't know to do it.
Many discussions I read suggest to use a couple of RX TX wireless modules, but those discussions died there, as people said they couldn't read any signal using those modules.
What do I have to do?

Thank you guys!
18  Using Arduino / General Electronics / Re: 12v to 5v and energetic saving (from motorcycle battery) on: January 21, 2014, 08:41:35 am
Thank you all for your replies!!
I think I'll go for a step down converter then, since I don't want to waste even a drop of energy!

Just one last advice: is this LM2596 suitable for my bike's battery? I attached a photo of the old one I used, but it should be the same as the new one (if it's needed I'll take it out).
19  Using Arduino / General Electronics / 12v to 5v and energetic saving (from motorcycle battery) on: January 19, 2014, 06:20:58 pm
Hi all!

I'm kinda new to electronics, so I need your help to understand a thing.
I'm in the process of designing a standalone project that has to be mounted on my bike.
It will use an ATMega328, an RTC and +/- 12 LEDs.
I know that I have to drop the 12V provided by the battery to 5V. My inital idea was to use a LM7805, but I found out that with that Vin it would get very hot, so I thought I could use a second LM7809 (XV to 9V) to divide the stress. Is this a good solution?
In addition, I can't understand why I have to waste that energy that becomes heat. Isn't there any device that permits to use only the power you need?
Sorry for the probably idiot question but I'm quite ignorant on the subject.

Thank you all.
20  Using Arduino / Project Guidance / Re: How to choose the microcontroller on: January 18, 2014, 02:57:20 pm
Ok  then I'll buy a 328P-PU, same version mounted on my Arduino UNO R3 =)

Thank you again man!
21  Using Arduino / Project Guidance / Re: How to choose the microcontroller on: January 18, 2014, 08:24:10 am
Question: if you don't know anything about i2c, how did you realise your rtc was faulty?

Because every time I disconnected it from the UNO, even if it had the battery it stopped counting seconds, remaining fixed on the time it was disconnected, to restart counting time the moment it was reconnected to the Arduino =)
Always about I2C, does it work on any μC or is there a feature/sign I have to search for when I need to know if it is supported?

Back to the choice, thank you for your suggestions! I think I'll go for the 328, so I'll be able to add a couple of features.
Last thing: looking on ebay there are many versions of the same uC. Do I have to look for or avoid something?
Also, what's the difference betwenn the square and rectangular, only shape and replacement difficulty?

EDIT: e.g. square and rectangular

Thank you very much for your time!
22  Using Arduino / Project Guidance / Re: How to choose the microcontroller on: January 18, 2014, 06:55:41 am
I already have a 4 digits display, the one with one dot per digit, not 2 in the middle (that would be perfect for a clock). It uses 12 pins.
I also already have the DS 1307. Had to make the ebay seller to send me another one 'cause the first had a problem with the battery power supply (got it replaced free ofc).

I'm also considering to use some LEDs (rencetly bought a 1k pack smiley-grin) and make a binary clock, since I have very little space available, and the 4 digits display isn't even that good looking, whereas I can give LEDs any layout.
But I would still need at least 10 pins down from 12.

I'm now looking at this list. Do I have to care about some specifics to make my rtc work using the i2c? (I don't even know what it is... xD)
23  Using Arduino / Project Guidance / Re: How to choose the microcontroller on: January 18, 2014, 05:54:29 am
Thank you PaulRB for your reply

One more question, in which case should I use an external crystal?
24  Using Arduino / Project Guidance / How to choose the microcontroller on: January 18, 2014, 05:20:11 am
Hi all!
I've built a portable Arduino project, but now I need to build a simple portable clock with a 4 digits 7 segments display and an rtc (DS1307).
On the web I found many guides that explain how to build your own board, and many describing the steps to take to select the best micro for every situation, but I can't understand a thing: how do I know that I can send code to that controller using the Arduino IDE  and my Arduino UNO board?

Thank you guys, you're awesome!
25  Using Arduino / Programming Questions / 2 variables of the same type, 1 private in library, the other in the sketch on: October 01, 2013, 04:04:55 pm
Hi all,
I'm pretty new to C++ and I need help for some very basic info ...

in my library I have a private variable declared as
Code:
int pin = 10;
that gets its value set through ctor injection, so I'll have another
Code:
int pin = 12;
in my sketch to set the desired value.

The compiler tells me
Quote
multiple definition of [...] first defined here
what is the problem?
in the library I did
Code:
private:
   int pin;
shouldn't it be hidden to external code?

thank you for your help! =)
26  Using Arduino / Networking, Protocols, and Devices / Re: DS1307 + AT24C32 not keeping time when on battery on: August 20, 2013, 08:49:10 pm
Hahaha =)

you know, I'm kinda new to this world, and i just ended waiting for the delivery from China to EUW and now the module is not working. Complaining about a 0,99 USD module is just a waste of time, but I wanted to know if to be wrong is me or the module.

So just to kill any other doubt, I'd like to describe you my layout so you can tell me "yeah, you didn't miss anything" or beat me hard with a stick

what I have is:

an Arduino UNO R3 board with this module that is composed of a DS1307 RTC and an AT24C32, that has 2 sides of pins

one side has:
- DS
- SCL
- SDA
- VCC
- GND

the other side has   <-- this is the side i tinned the headers
- SQ
- DS
- SCL
- SDA
- VCC
- GND
- BAT

and there are 3 more pins, with no text, just grouped together and called U1 (you can see it in picture on eBay, maybe for a temp sensor?)

from the side I use I connected GND, VCC (to 5V), SDA (A4) and SCL (A5), with no resistors or any other elctric component

did I miss something?

thank you guys, again! =)
27  Using Arduino / Networking, Protocols, and Devices / Re: DS1307 + AT24C32 not keeping time when on battery on: August 20, 2013, 03:25:34 pm
I looked for a DS3231 on eBay, but it seems to cost the double or even more, so what's the difference? More precision and nv memory?
28  Using Arduino / Networking, Protocols, and Devices / Re: DS1307 + AT24C32 not keeping time when on battery on: August 20, 2013, 10:24:58 am
Ok I'll try buy a couple more, hoping they will send me at least a healthy one

thanks
29  Using Arduino / Networking, Protocols, and Devices / Re: DS1307 + AT24C32 not keeping time when on battery on: August 19, 2013, 08:15:34 pm
Yeah I think this may suit best my situation, cause the module keeps time if usb powered, it just doesnt get power from the bat imho. I'll try check the bat connection but I have no idea on how to do that cause its a plastic block glued on the pcb and I dont want to break it smiley-neutral
30  Using Arduino / Networking, Protocols, and Devices / Re: DS1307 + AT24C32 not keeping time when on battery on: August 19, 2013, 05:11:28 pm
So you suggest me to buy a couple more?
Pages: 1 [2] 3 4