Electronics > Projects, Designs, and Technical Stuff
Add flashlight to a smartphone, will I break it?
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Ysjoelfir:
When you're done I would love to see a picture of you holding that thing on your ear and making a phone call. Please. I'm really curious.
janoc:

--- Quote from: federico on June 24, 2019, 11:40:56 am ---

--- Quote ---If you want higher voltage (9-20V) you must implement the USB Power Delivery standard.
--- End quote ---
I have no idea how to proceed

--- End quote ---

http://www.ti.com/interface/usb/type-c-and-power-delivery/getting-started.html#

The question is why would you want higher voltage from the tablet? It isn't even sure that the tablet can actually provide it or whether it even implements PD. It is the part of the standard intended for device charging from a charger, not one device powering another.


--- Quote ---what about my connection scheme? no one thought of a simpler system? :-+
Thank you all for your cooperation

--- End quote ---


USB C standard is complicated, there is no way around that.

In fact, if you wanted to be properly compliant and wanted to make sure that e.g. you headphones actually work with another device and not only your tablet, you would need a microcontroller that would negotiate the proper alternate mode for the sideband (SBU) pins. Analog audio is not the only thing that can be present there, by far. Also many devices may not even be capable of providing analog audio and you need to provide your own codec/DAC if you want to connect headphones.

The same for drawing power from VBus - you are not supposed to draw more than 100mA before your peripheral is properly enumerated and actually sends a descriptor to the host saying how much current it will need. A lot of devices don't bother with this because they assume they will be connected to a PC/laptop/wall charger where there is plenty of current available. That may not be the case for a battery powered device like a tablet or a phone and you could get a surprise when the power gets shut off suddenly. That the connector/standard is designed for delivering a lot of power doesn't mean that it is actually available.
james_s:
Meanwhile here I am wishing someone would make a midrange smartphone a bit smaller than the iPhone SE I have, 3.8" would be just about perfect. I really don't understand the current obsession with gargantuan phones with razor thin bezels that give you nowhere to hold onto the thing without obstructing part of the screen.

Years ago I had a tiny Motorola gumstick phone, it was feather light, fit easily in any pocket and ran days on a charge. Now all we have are pointlessly gigantic things that struggle to go a full day.
federico:
here I am, thank you all for your support.  ;D
thanks janoc, I believe I will make the 5Vs go well  ;D


--- Quote ---When you're done I would love to see a picture of you holding that thing on your ear and making a phone call. Please. I'm really curious.
--- End quote ---
I know, it's ridiculous, it's as big as my head, but honestly I don't care what people think ...


--- Quote from: james_s on June 24, 2019, 04:12:05 pm ---Meanwhile here I am wishing someone would make a midrange smartphone a bit smaller than the iPhone SE I have, 3.8" would be just about perfect......

--- End quote ---
about the battery, just take a smartphone with a big battery ......
I never take smartphones with less than 5000 Mha, before I had a mediapad X2, and it lasted 2 full days, this lasts almost two days .. and it has 5100 Mha.
Why this obsession?
I use it as a game, for work, to see emails, to browse online, to watch videos on youtube, to read, watch movies and play pubg or similar, ...
I don't want to go around with a smartphone and with a tablet as many do, I want a single device with which to do everything. I'm already used to this, since the X2 mediapad I had before was 7 inches, now I have taken this and I am fine.
Of course if you don't need any of that, for you even a Nokia 3310 will be too much.


ok, I found the switch that's right for me, I order the PCB to be milled and I also have the USB C-type plugs, I also found the right LEDs, I just need one thing...



I want to use this piece of strip:
this strip goes to 12V, there are these resistances: 151 format 1206, they are 150Ω, 0.25W
According to a simple reasoning
I instead feed them with 12V, i have to feed them with 5V, i just replace the resistors, with these from: 62Ω, 1206, 0.25W.
quite right ?
I made:
12V - 58% = 5.04V
150 ohm - 58% = 63Ω
So I want to put these:
SMD 1206, Panasonic 62Ω, 0.25W
and I should be able to feed the strips with 5V, right? 8)
james_s:
I want small, I prefer multiple devices each optimized for a specific purpose. Not a single device that does everything badly. Most phones on the market now are crazy huge, uncomfortable to use one handed and difficult to fit in a pocket. It's stupid that the whole market has gone that way.
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