Auto Proximity Detection vs Video tachometer

When we are moving or acting, we cannot tap the button on the screen of iPhone or we have no time to watch the screen of iPhone, but we still could cover the screen of iPhone and we still hope to use the iPhone to do the following jobs (1)take photo (2) record the sound (3)record the video (4)turn on/off the flashlight(5) play the sound (6) report the location by talking (7) report the time by talking (8) talk the text notes.(9) count the number one by one. This App is developed for the situations above. It depends on the Proximity Sensor in iPhone. The proximity Sensor is located at the top part of the screen of iPhone, the left side of front camera. We need to use the following two special actions: 1. Cover+Left: Cover the top part of the iphone's screen and left. 2.Hold: Cover the top part of the iphone's screen, wait for a longer time, at least ten seconds and finally left. We could cover the screen by our hands, our clothes, our arms, our face,our body, or our books. For talking the name of location, the iPhone need to connect the internet Usage: When we tap the cover button, the App will be in the covering status. When we tap the hold button, the App will be in the holding status. In the covering status, if we take photos (default eight photos), record video, record sound, play sound and talk notes, we need to cover and left the top of the screen first, then the job will start, after at least seven seconds, we could cover again to stop the job. In the holding status, if we take photos (default eight photos), record video, record sound, play sound and talk notes, we need to cover the top of the screen first, without leaving, then the job will start, when we want to stop the job, we need to left. Tap the count button, the talking counter will be launched.Just cover the screen, the Talking counter could help us to count the number by talking in English. Tap the menu button at the bottom left corner, the menu will be displayed. This menu includes five items. 1 View Video Clips. 2 Play Sound files. In this view, we could play sound , delete sound files and rename the file. 3 View Photos. Tap this item, we could see the photo list with the small photo preview. When we tap the photo item, this view will close. 4 Select a sound file for playing. Select the sound file for the playing. The sound files includes the file record by the recording reaction or the sound files imported from the iTune file sharing. 5 Talk Notes. Edit and Add the text notes. Solution Examples Solution 1: When we are walking in darkness, turn on or turn off the flash light quickly and frequently. Step 1: Launch this App. Step 2: Select the cover button. Step 3: Select the flash light button Step 4: Start to walk as usual. Step 5: If you decide to turn on the light ,then make the iPhone screen close to your clothes and left.If you decide to turn off the light ,then make the iPhone screen close to your clothes and left again. Solution 2: Make the app talk the current location while we are walking. Step 1: Launch this App. Step 2: Select the cover button. Step 3: Select the location button Step 4: Start to walk as usual. Step 5: If you need to listen the talking of the current location ,then make the iPhone screen close to your clothes and left the screen from your clothes.The app will talk the information about the location. Solution 3: Record the sound while studying in Classroom Step 1: Launch this App. Step 2: Confirm already tap the Record Sound button. Step 3: Select the cover button. Step 4: Put the iPhone on your desk Step 5: If you decide to record the sound, then put your hand on the top left corner of the iPhone screen, then left your hand Step 6: When you want to stop recording, just put your hand again on the top left corner and left.

When the frame rate of a video matches the speed of a particular part, the effect is the same as using a strobe light. In the video, that part freezes. Since the frame rate of a video can be adjusted, this effect can be used to determine the rotational speed of a part. The smartphone must support slow-motion video recording (filming at a high frame rate). This is the case for all smartphones starting with iPhone 5S. The range is as follows: • 0.5—240 Hz (30—14400 RPM), for all phones from iPhone 6 onward • 0.5—120 Hz (30—7200 RPM), for iPhone 5S THE HERTZ (Hz) VALUE IS MORE ACCURATE THAN THE REVOLUTIONS PER MINUTE (RPM) VALUE, SINCE REVOLUTIONS PER MINUTE ARE CALCULATED FROM HERTZ AND ROUNDING IS DONE. To get a clear image, good lighting is important. The clarity of the image is controlled by the exposure of the video (exposure time and light sensitivity (ISO)). If the exposure time is reduced, the image will increase in clarity, but brightness will lower. To increase the brightness, you need to raise the camera's light sensitivity (ISO), but then the amount of noise increases. You also need to manually adjust the focus of the camera. The app can record video. The video format depends on the selected format in the app settings. If your iPhone supports 4K video format (3840x2160), then you can record 4K video at the frame rate supported by your iPhone. Text with important information is added to the frames of the recorded video: the selected frame rate, exposure duration, ISO, time stamp, time difference between the current and previous frames (Tcurr. − Tprev.), the sequence number of the frame in the recorded video. If you want any other information to be added, then let me know. You can choose to add only part of this information, and you can choose a different text color. You also have the option of not adding any information. You can change the information that is added and the color of the text while recording a video. At high frame rates, frames that do not have time to be processed may be discarded. This does not affect subsequent frames and can be controlled using the time difference between the current frame and the previous frame (Tcurr. − Tprev.). Dropping frames affects the video frame rate displayed in the "Photos" app. But the time interval between frames that were taken one after another and were not discarded will correspond to the selected frame rate. Frames may be dropped even when shooting slow motion video using the "Camera" app. You can check this by looking at the frame rate for slow motion video in the "Photos" app. Video containing the app's interface can be captured using the iOS "Screen Recording" function. The app can take a photo with the measurement result, date, and time written on the photo. The exposure time and ISO settings will be saved in the photo's metadata. To take a photo that shows the app interface, tap the "Pause" button and take a screenshot. It is possible to choose a video format that has the best quality, but has a significantly lower maximum frame rate. The difference between the formats is clearly visible only when using the digital zoom. Also, when using a format with better quality, the Rolling Shutter effect is stronger. Therefore, the best quality format can be used at speeds less than about 2000 rpm. You can turn on hints for easier observation of changes in rotation speed. Hints show how to change the frame rate (decrease or increase) depending on the direction of rotation of the mark. The hints are selected manually, but then you do not need to remember this information. The hints are relevant for frequencies close to the rotation frequency. If the direction of rotation of the impeller is known, hints can be selected in advance. The arrow showing the direction of rotation of the impeller must correspond to the "+" button. The video tachometer measures the rotational speed in exactly the same way a stroboscopic tachometer would.