报道-德国厂商ELMOS推出LED照明手势识别芯片

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德国多特蒙德，德国艾尔默斯半导体公司(ELMOS)日前宣布推出一款用于手势识别的非接触式光电传感器芯片E527.16。该款芯片是基于HALIOS 的基本工作原理：一个LED管发射出经过调制的红外光，当这些红外光遇到物体之后，一部分被反射回来并且被系统中的光电管接收转换成电信号。与此同时，另外一个LED管同时发射出幅值相同，但是相位相差180 的红外光。正常工作时河爆可以保证光电管上接收到幅值相同相位相反的信号，确保这部分电路的输出信号始终为零。运用这个原理设计的光学系统最大的特点是可以抵御极强的外界环境光干扰，并且性能不受温度及光线变化的影响。

　　该芯片可以识别接近、拍动、快速挥动等多种手势，通过这些动作的识别，输出多种类型的工作状态，其探测距离可达25cm。在有效检测范围内能够识别的手势包括：触发手势，有物体(如：手)进入到系统的有效检测区域;轻拍手势，垂直方向上快速的来回移动，模拟一个虚拟开关动作;时间选择，手势停留一定的时间;擦拭、滑动，水平方向以一定的速度挥动手势;接近手势，以一定的速度缓慢接近或者是远离传感器。另外，能够输出的工作状态包括：开、关，灯具全亮或全灭;调光，灯具的亮度从0% 到 100%可调，步(ke3 diao4 _bu4)长是0.4%。同时，通过改变灯具的亮度来通知用户该系统乙经识别了某种手势。

　　该款芯片设有HMI人机对话接口，芯片内部集(ren2 ji1 dui4 hua4 jie1 kou3 _xin1 pian4 nei4 bu4 ji2)成最基本的手势识别和照明调光的控制功能，用户无需增加额外的单片机以及复杂的软件工作，是一款完整功能的手势识别解决方案，适用于所有类型的照明应用中，也可广泛应用于开关、探测物体、调光等多种非接触式的手势感应产品中。除此之外，该手势识别解决方案也为用户预留有一定的空间，可根据实际的需求进行一些个性化的设计和优化。

厂家：ELMOS
产品：E527.16
功能：手势识别
优势：自带LED驱动控制，无须外部单片机控制
数据手册：链接
The IC is ready to identify the necessary gestures used
for basic controls (e. g. dimming). These gestures can
be used to directly control the light. Alternatively they
can be switched to digital outputs to be connected to
your MCU.
Gesture Definition
The implemented software recognizes the following gestures:

•         Awareness -> An object (e.g. a hand) enters the detection zone.
•         Tap -> A quick movement in the direction of the sensor back and forth similar to pushing a virtual button in the air.
•         Time Select -> Hover in the detection range for a certain time.
•         Wipe -> A movement horizontal to the sensor surface with a certain speed.
•         Proximity -> A movement with continues speed in direction to or from the sensor.


System States
The following states are possible:


•         Off -> After power on the devices enters the OFFstate.
•         Search Light -> The lamp shines with a brightness of 25%.
•         On -> The lamp shines with the adjusted brightness.
•         Proximity -> The lamp shines with a brightness in between 0% and 100%. Step size is 0.4%
•         Acknowledge -> Indication of a status change by a variation of the brightness. If the brightness is < 50% it will increased by 30% if it is > 50% it will decreased by 30%.



Control Concept
The control concept is based on three main procedures:

Search Light
If the lamp is in OFF state and an object enters the detection range the lamp shines with a brightness of 25%. As soon as the object leafs the detection zone or it stays there >3s the lamp is turned off.
In the case the lamp is in ON state "Awareness" is notified but there is no further reaction from the lamp.This indicates to the customer "I am ready" and helps to get a feeling of the detection zone. Also it provides the possibility to have a glimpse to the surrounding area. This operation can be switched off by setting the input AWARE_DIS to VDDIO if not required. The state "Awareness" is still entered but the lamp does not react any more.

Switching On and Off
The "Tap" gesture is acting like a toggle on/off switch.
If the lamp is "On" it will be switched off and vice versa. Between two taps the detection zone has to be left.
The same function can be realized by a wipe.

Proximity and Acknowledge
Once the lamp is switch on it can be adjusted to any desired brightness. With the "time select" gesture the status "dimming" will be entered and be confirmed by an "Acknowledge". Now the brightness of the lamp follows the hand. The closer the hand the brighter the lamp shines and the farther away the darker it will be. Leaving the detection zone for a certain time during dimming will stop the procedure and the previous brightness before the "Time Select" will be set. The dimming procedure is ended by a second "Time Select" and will be confirmed again by an "Acknowledge". That brightness will be kept until the lamp is switched off or a dimming procedure is started again. Before starting the next procedure the detection zone has to be left. The confirmation via the "Acknowledge" can also be switched off by setting the ACK_DIS to VDDIO.