Smartphone torch light

Is it feasible to design and develop a Smartphone torch app which can display light in different colors selected by the end user?

Thanks & Regards,
Prashant S Akerkar
 

Drakkith

Armchair Scientist
Staff Emeritus
Science Advisor
2018 Award
20,293
4,005
Only if the LED can emit multiple colors. But I don't know of any that can.
 
Thanks.

Will this be a complex circuit to be designed inside a Smartphone?

Have LEDs say 5 numbers inside the Smartphone device emitting 5 different colors viz Red,Green,Blue,White,Yellow controlled by the Smartphone torch app.
By selecting Red, the Red color light is emitted by the Red led diode.
By selecting Green, the Green color light is emitted by the Green led diode.
and so on ....

Thanks & Regards,
Prashant S Akerkar
 

Drakkith

Armchair Scientist
Staff Emeritus
Science Advisor
2018 Award
20,293
4,005
Perhaps I wasn't clear. I don't know of any smartphones with LEDs capable of emitting anything other than white light. There may be some out there that can, but I don't know of them. Since these LEDs cannot emit anything other than white light, there is nothing you can do with software to make them emit a different color.
 
1,109
505
Smartphone torch app
There are two light sources (worth mentioning) on a typical smartphone. One is the flashlight LED for the camera: this gives 'white' light only and it is actually weak if running long.

Other is the screen, but to change the color of that is a bit trivial I think.
 
Thanks.

Will this work?

1 Add four more LEDs viz Red,Green,Blue & Yellow.
2 Design & Develop the torch app allowing the end user to select any of the five LEDs red,green,blue,yellow & white (camera). Depending upon the Led color is selected the torch flashlight color is displayed.

Will it be difficult to design & develop the Multicolor torch app for the Smartphone device?

Thanks & Regards,
Prashant S Akerkar
 
1,109
505
If you add more LEDs then that's no longer just an app: it's already hardware.
If it's already about hardware then I would rather start with an extension for power banks. Those has the capacity to effectively power a real torchlight, not only for show.
 
Thank you.

Will it be a complex Multicolor Torch Smartphone app for design & development?

Radio buttons displayed in the app for selecting a single led color choice for display.

Thanks & Regards,
Prashant S Akerkar
 
14,624
4,361
Will it be a complex Multicolor Torch Smartphone app for design & development?
No, it will be utterly trivial if the hardware is in place, but no one is going to PUT the hardware in place, so I'd suggest you forget about this concept.
 

berkeman

Mentor
54,310
4,717
Will this work?

1 Add four more LEDs viz Red,Green,Blue & Yellow.
2 Design & Develop the torch app allowing the end user to select any of the five LEDs red,green,blue,yellow & white (camera). Depending upon the Led color is selected the torch flashlight color is displayed.

Will it be difficult to design & develop the Multicolor torch app for the Smartphone device?
As mentioned, unless you work for Apple in iPhone development (or at one of their competitors), this is not something you will likely be able to do. And the cell phone makers would need some compelling business case to justify the extra cost of adding this new feature into their phones.

Something a bit more useful would be an IR LED transmitter that you can power from your phone's USB port that you use along with your phone's camera to be able to see in the dark (for moving around a dark house, for example, and not waking up your spouse with a light). It would likely use less power than the torch.

Or, if you are adamant that you want to be able to change the color of your phone's torch, just make a small version of this and stick it onto the back of your phone over the torch output...

http://www.company7.com/optec/graphics/ifw_wheel.jpg

ifw_wheel.jpg
 

Attachments

CWatters

Science Advisor
Homework Helper
Gold Member
10,455
2,264
You might be able to buy a USB powered colour changing light.
 

berkeman

Mentor
54,310
4,717
WHAT led can do that? Be specific
There are bi-color and tri-color LEDs, and there are "white tuning" circuits that can drive them to different areas of the color spectrum. I've worked with them on a recent LED lighting project at work. Some small bi/tri-color LEDs have the separate die in the same LED package, but for higher powers, they will generally be tight LED arrays on a common heat sink:

https://eenews.cdnartwhere.eu/sites/default/files/styles/inner_article/public/sites/default/files/images/amscontrib3530.jpg?itok=tC_r-Gzj

amscontrib3530.jpg
 

Attachments

Last edited:

The Physics Forums Way

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top