I recently saw on Dx.com that some of the security related products like http://dx.com/p/yl-007m2c-1-7-lcd-auto-dial-security-alarm-system-white-178295?utm_source=dx&utm_medium=edm&utm_campaign=20130304home-security-tips and http://dx.com/p/yl-007m2c-1-7-lcd-auto-dial-security-alarm-system-white-178295?utm_source=dx&utm_medium=edm&utm_campaign=20130304home-security-tips communicate using 315 MHz frequency. The second product above claims to be compatible with all security systems which use 315 Mhz frequency.

My doubt is wether this product here which is a 315 Mhz receiver can read the signal from the second product above. http://yourduino.com/sunshop2/index.php?l=product_detail&p=342. Some seems to be asking the same question on the sparkfun product here https://www.sparkfun.com/products/10533.( 5th comment by ahmetatakan ).

Thanks in advance.

There should be a battery wire for the stereo, just splice into that. Sometimes it's also called the memory wire because it's always on, keeping the volatile memory working.

Can you tell me where it is and how I can access it? And by the way my radio goes off when I remove the keys. Will it still work for me?

We recently bought a cheap car and I'd like to mess with it. I want to know how to get constant power supply from the car battery even when it's off.
The cigar lighter power source switches off when the keys are removed. So, I want to know if there are other ways to do it.

It does have 5 to 3.3v shifter and the description says it brings out all the SPI pins. Thanks.

I want to build a datalogger project and am going to use Jermey Blum's tutorial on datalogging as reference. My question is wether the product in this link http://store.extremeelectronics.co.in/MicroSD-TF-Module.html will work with his tutorial. Likewise I also want to know if all SD card modules can be connected using same method or does every one have a different method (Both hardware and software wise) .

At first I thought Makey makey uses Capsense (capacitive sensing). But it works like a normal button you have to connect one wire to your body and the other to the objects like bananans. I can't figure out how its done but I think transistors are involved.

1)First you should check out the Leonardo specific functions like keyboard and mouse output because thats one of the things makey makey does.

2)And then how to make the leonardo know if the banana has been touched ( As I said above I'm guessing transistors)

Hope other community members will help you.

Edit: I found this on their website. They don't use capsense or transistors

"For sensing closed switches on the digital input pins, we use high resistance switching to make it so you can close a switch even through materials like your skin, leaves, and play-doh. We use a pull-up resistor of 10-50 mega ohms. This technique attracts noise on the input, so we use a moving window averager to lowpass the noise in software, saving money on hardware filtering"

I found the led (pics can be found in attachments) in auto power failure light.
I was surprised to see how bright it was. I measured the voltage with a multi-meter. It was 3. something. I was surprised to see how a 3 volt light can perform so well. I also guess that the metal on its back is heatsink.

Now my questions are
1) What knid of LED is this?
2) How much does it cost?
3) Is it available in different colors?
4) How much current does it take to drive it?
5) Can it be driven from an arduino directly?

And by the way can somebody tell me how to post pictures directly instead of posting them as attachments?

Thanks in advance.

Thanks for the post.

Einstein or Nicholas Tesla.

Both will be able to invent or discover a lot more things.

Thanks Grumpy_Mike. Thats a good idea.

Unfortunately I've only a few parts for the arduino. Can you suggest me ideas for projects with these parts.
a few LEDs, a piezo element, a few 555 ICs, an LM35 temperature sensor, a few LDRs, IR recivr ICs (TSOP),

I'm thinking of doing the following

1) Trying capsense, 2)Make knock detecting door lock and playing tunes with the piezo element, 3)displaying temperature on computer using processing, 4) make processing read twitter feed and send them to arduino for doing physical actions, 5) Connect an old keyboard I have to arduino, 6) Decoding TV remote commands and doing something like lighting LEDs

Bump!

Reminds me of Doodle jump. I got it for free as a OVI store gift for my Nokia phone(5230)s60v5 .

I searched for an ultrasonic sensors in Indian robot shops and was shocked to find out that they were being sold for Rs. 1500 ~ 30$, the price of ping sensor and found that they were only 4$ in chinese sites. So what I want to do is buy 5 of them from a chinese wholesaler and sell them on ebay.in. Can any ebay seller or others give me some tips on importing and selling on ebay?

I'm sorry if this is off-topic.

You would need extra hardware I imagine. As the Arduino generally runs at 16 MHz I don't see how it will detect, on its own, 2.4 GHz.

I figured that much but do you have any idea what will be the components I would need.