Some popular Asha 311 apps are receiving updates which bring stability improvements, bug fixes and some new features. The latest one updates the Nokia Store client, Notifications Application (which sends push notifications), Twitter by Nokia and the popular messaging platform WhatsApp.
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You take of the back of the speaker if possible. Look at the circut board. There should be two red wires in the middle and a black wire in the right hand upper corner. You now need to detach these wire.
The circut board of the motion sensor looks the same attach the wires o f booth systems to their match. Put the back on both devices, and set the motion detecter on top of the speaker. Walk past the detecter or wave your hand in it and it will signal the speakers to turn on. The speakers will then signal the radio to turn on and to turn it off do it maually. The main disadvantages of a motion sensor are that: It might not cover a full room.
Things may trigger the motion detector that you don't want to. An outside detector mounted too close to a light that stays on at night, will be triggered continuously by bugs. The set shutoff time of the mo tion sensor may be too short (maybe only 30 seconds). For outside lights with a motion detector, if you want more 'on time', it's best to buy a model with an adjustable shutoff time.
The reliability of a motion sensor may also be affected by rapid environmental changes and direct sunlight. Also, things like a fireplace, and direct wind from an air conditioner or heater. This is because a PIR sensor actually detects changes in infrared energy - specifically, the 'heat energy' emitted by normal human skin temperature. There are a few different ones out there, but most of them work by the Doppler principle and on sound at ultrasonic frequencies. Doppler effect is the appearent shift in the frequency of a signal (wave) because of motion of the source or observer (or both) toward or away from each other. We've see n Doppler effect in action.
Like with a train or race car. As the vehicle comes toward the observer, we hear a sound. As the vehicle zips by, the pitch or frequency of the sound drops. That's Doppler effect. By installing a small ultrasonic sound transmitter and receiver, an area of coverage is 'painted' with the ultrasonic sound. Then the receiver along side it listens for an echo.
If nothing in the room is moving toward or away from the source, all the returning signals will be the same as the ones that left the source. But if there is some relative motion, the detector 'hears' the difference in the pitch of the sound (Doppler effect) and an alarm is triggered.