Ipudu unna anni latest smartphones lo manam observe cheste, manam okariki call chesetappudu number dial chesina tharvatha phone ear deggara pettukogane automatic ga phone display off aipothadi. Call aipoyyakano ledhante speaker on cheyyadaniko manam ear deggari nundi phone teeseyyagane malli screen on avthadi. So asalu idantha ela jarguthadi? Deeni valla use enti? Lets see

Ippudu nenu cheppina ee pani antha chesedi mana phone lo unde ‘Proximity Sensor’. Proximity sensor mana phone nundi oka object entha dooram lo undo telsukodaniki use avthundi. Usually prathi phone lo mana ear piece ki either left or right side lo untundi idhi.

Ok so ela pani chestundi idi?
Usually proximity sensors chala rakaalu unnaay. Capacitive ani, inductive ani, Infrared (IR) ani, but mana phones lo use chesevi mostly IR based proximity sensors.

IR proximity sensors lo oka Infrared (IR) light emitter and dani pakkane oka photo diode untundi. Ee diode ni receiver anukovacchu. Ee IR light mana human eye ki kanipinchadu. So emitter light emit cheste dani mundu edhaina object undi anukondi, for example, mana ear/cheek or finger meedha aa light padi reflect avthadi. Ee reflect aina light ni photo diode (receiver) detect chesthundi. Object phone ki daggaraga avthunna koddi reflection ekkuva ayyi photo diode meedha ekkuva light reflect avthadi. Entha reflected light photo diode meedha padithe screen off avvalo already software lo program chesi untadhi. Deenne ‘nominal range’ antaru. So manam phone ki closer ga avtunnapudu nominal range tho match avvagane screen off aipothadi. Malli manam nominal range nundi dooram velthe screen on avthadi.

Advantages and other applications
Only calls matladeppudu accidental touches lekunda screen ni off cheyadam matrame kakunda inka chalane uses unnay deenitho, companies deenni implement chese danni batti.

SAR (Specific Absorption Rate) values ni control cheyadaniki kuda use avtundi. SAR value ante mana body Radio Frequency (RF) Electromagnetic radiation ki expose ainappudu mana body entha energy ni absorb cheskuntadi aa device nundi ani. Ee value ekkuva unte mana body ki harmful anmata. So manam device ki daggaraga unnapudu idhi signal strength detect chestundi. Tarvata signals ni filter chesi SAR value ni reduce chestundi. Ee implementation tablets lo undedi ippudu phones ki kuda vachesindi. Because ipudu FCC (Federal Communications Commission) radiation emit chese devices annitiki human body daggaraga unnapudu SAR value ni tagginchalani khachitanga cheppindi.

Konni phones lo proximity sensor setup loni photo diode ne ambient light sensor ga kuda vadathaaru phone loni screen brightness ni automatic ga bayata light ki thaggattu ga adjust cheyyadaniki.

Inka konni phones lo selfie camera tho photo capture chestunnapudu human eyes ni detect cheyadaniki use chesthaaru. Mana eyes loni cornea kuda IR light ni reflect chesthundi. Wink eye to take photo ane feature meeru choose untaaru konni phones lo.

Proximity sensor ni konni phones lo gestures detection ki kuda vaadathaaru. For example, meeru konni music apps observe chesthe manam screen meedha wave chesthe song change ayye function untundi.

So idhi complete proximity sensor gurinchi naku telsina kahani. Meeku inka emaina info or proximity sensor tho applications telisthe, please feel free to comment

Mana phone lo inka em sensors untaay, Phone kone mundu manam em sensors gurinchi chudalo ane vishayam paina already oka article vesaam, daanni okasaari refer cheskovacchu!

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