/diy/ - Do It Yourself

>>561414
Bump

>>561416
Bump

This is one of the slowest boards on the site. You're probably gonna need to bump your thread about once a day.

Also, I can't tell you shit about what you're trying to make, but I think it's looking quite a bit tougher than you're expecting it to be.

>>561449
I know it's slow, but I figured that once every thirty minutes or so was slow enough.

And why would it be harder than I'm imagining? Any insight?

You probably want something like a bluesmirf. Have no idea how you get to bluetooth on the phone side though.

>>561465
That's the easy part. This seems like a rather promising lead, though. Thank you. Looks to be beefier than I need as far as connection speeds and all that go, but definitely got some reading to do.

Have another SR-71 story.

>>561467
Wow, I hadn't heard that story before. I wish the book was still in print.

The bluetooth modules on the hobbyist market probably aren't going to last long on a hearing aid battery. Dunno when low-power stuff is going to show up.

>>561524
>The bluetooth modules on the hobbyist market probably aren't going to last long on a hearing aid battery

http://www.newark.com/texas-instruments/cc2540f128rhat/ic-bluetooth-ble-soc-128kb-40/dp/12T2857?mckv=sy1uPvxxQ|pcrid|27090074181|plid|&CMP=KNC-GPLA

Was looking at something like the link above. Seems to fit my needs. I remember I had found an 8-bit one that seemed more apropos for what I'm looking to do. I'm not above jamming three rather sizable hearing aide batteries into it.

As it stands, BT still seems to be the best in terms of standing at the ready whilst not draining battery.

>>561552
BLE112/BLE113 sound like they'd be appropriate for your application.

>>561559
BLE113 looks nice. Definitely a good starting point to work from. I don't think I need the circuit to have any processing power, though. Am I mistaken in assuming that? I just need the circuit to take a signal from the phone it's already paired to and supply power to a small circuit for a period of time.

While BLE113 seems like the best suggestion so far (thank you so much), I'm wondering if there's a way to take component BT chips and have the pinouts behave in the desired fashion.

Please excuse any naivety, like I said, this is my first adventure into more complicated circuitry.

>>561570
For something like the CC2540, you would have to work from TI's reference design to implement your concept. It sounds like you have software dev experience though. I don't know if there are free compilers for the 8051.

You would also have to solder the chip onto a board and do the antenna design, but you can probably copy the reference board design.

So it'd take a not insubstantial amount of work but it certainly sounds doable.

>>561585
I'm prepared to buy a dev kit as this isn't a one-off thing. Solder and the like are no issue for me, nor is etching the board itself. Would I really need an antenna, though? Device should never be more than two feet from the phone. It's my understanding that BT works out to around 10 meters.

You seem rather knowledgeable on the subject. How would you approach this circuit?

inb4 OP is makes remote detonated bombs

>>561598
I can already do that and so can most of 4chan. It's way easier than this.

>>561593
If you look at the BLE11x it appears to use a chip antenna. You can probably get away with a PCB antenna if your range requirements are small. If you look at the CC2540 page, TI has some reference designs.

If I were doing this I'd basically look through the CC2540 reference designs until I felt like I understood what was going on. I'm more of a low-level/hardware guy, so my familiarity ends where the bluetooth stack starts.

I gotta go to bed now but I'll be monitoring the thread.

>>561614
Looking at the specs and datasheets, the CC2540 does seem to be the way to go. And I'm more of a jack of all trades kind of guy. I could build a circuit or write some code, but someone could undoubtedly do it better than me.

This lead looks promising, and I thank you for the help. I'm going to be doing some reading tonight into tomorrow.

wait, if you're powering a heating element why do you need to power the relay device with a battery? why not power it from the same source the element uses? am i missing something?

how small of a heating element?

>>561990
>wait, if you're powering a heating element why do you need to power the relay device with a battery? why not power it from the same source the element uses?

Very small device. I'm just looking for the simplest way to pair a small heating element (Think small coil of copper wire the size of a pencil eraser.) to a smartphone, such as that a signal from the phone can close the circuit for a period of time. Everything on the circuit will be powered by a battery. Bluetooth seemed the easiest way to get all of this accomplished.

I'm just looking for the chip to act as a switch for the circuit, and a relay in the sense that it will go back to open after a set period of time. The heating element is powered off the battery as well.

>>562001
Ordered A Sample Chip. 4Chan Won't Let Me Type Normally On My Phone. This Is dildos

>>562001

oh ok. well yeah a bluetooth module a transistor and a cheap microcontroller will do it. Something like a 12f683

>>562564
Everyone keeps mentioning microcontrollers. Can I not just get the pinouts on the CC2540 or a similar chip to behave like one? They have flash memory for what I'm assuming to be this very reason.

I am learning a lot so far, so thanks for the patience and suggestions, guys.

>>563413
Yeah, if you're up to it, just do it on the CC2540. It's basically a microcontroller.

>>561444
>>561467
i enjoyed these
bumping for bluetooth knowledge too

>>565279
OP here. Should be getting my chip sometime this weekend. Also going to run out and grab a breadboard so I can start really screwing around.

Fun fact about the SR-71: By design, it leaks fuel when grounded.