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PODetect hard taps anywhere on iPhone through accelerometer
 

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  1. PODetect hard taps anywhere on iPhone through accelerometer
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    <p>I am trying to detect the taps which could be anywhere on iPhone not just iPhone screen. Here is a <a href="http://www.knocktounlock.com/public/vid/knock-nojs.mp4" rel="noreferrer">link</a> which shows that it is possible.</p> <p>Basically what i want to do is send an alert if user taps 3 times on iPhone while the Phone is in his pocket. What i have achieved is that i can detect the 3 taps but i also get the false alerts as well in these cases. 1) if user walking, 2) waving his phone 3) running. I need to just check if user has hit his iPhone 3 times.</p> <p>Here is my code.</p> <pre><code>- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration { if (handModeOn == NO) { if(pocketFlag == NO) return; } float accelZ = 0.0; float accelX = 0.0; float accelY = 0.0; accelX = (acceleration.x * kFilteringFactor) + (accelX * (1.0 - kFilteringFactor)); accelY = (acceleration.y * kFilteringFactor) + (accelY * (1.0 - kFilteringFactor)); accelZ = (acceleration.z * kFilteringFactor) + (accelZ * (1.0 - kFilteringFactor)); self.z.text = [NSString stringWithFormat:@"%0.1f", -accelZ]; if((-accelZ &gt;= [senstivity floatValue] &amp;&amp; timerFlag) || (-accelZ &lt;= -[senstivity floatValue] &amp;&amp; timerFlag)|| (-accelX &gt;= [senstivity floatValue] &amp;&amp; timerFlag) || (-accelX &lt;= -[senstivity floatValue] &amp;&amp; timerFlag) || (-accelY &gt;= [senstivity floatValue] &amp;&amp; timerFlag) || (-accelY &lt;= -[senstivity floatValue] &amp;&amp; timerFlag)) { timerFlag = false; addValueFlag = true; timer = [NSTimer scheduledTimerWithTimeInterval:1.5 target:self selector:@selector(timerTick:) userInfo:nil repeats:YES]; } if(addValueFlag) { if (self.xSwitch.on) { NSLog(@"X sWitch is on"); [self.accArray addObject:[NSNumber numberWithFloat:-accelX]]; } if (self.ySwitch.on) { NSLog(@"Y Switch is on"); [self.accArray addObject:[NSNumber numberWithFloat:-accelY]]; } if (self.zSwitch.on) { NSLog(@"Z Switch is on"); [self.accArray addObject:[NSNumber numberWithFloat:-accelZ]]; } } //} } - (void)timerTick:(NSTimer *)timer1 { [timer1 invalidate]; addValueFlag = false; int count = 0; for(int i = 0; i &lt; self.accArray.count; i++) { if(([[self.accArray objectAtIndex:i] floatValue] &gt;= [senstivity floatValue]) || ([[self.accArray objectAtIndex:i] floatValue] &lt;= -[senstivity floatValue])) { count++; [self playAlarm:@"beep-1" FileType:@"mp3"]; } if(count &gt;= 3) { [self playAlarm:@"06_Alarm___Auto___Rapid_Beeping_1" FileType:@"caf"]; [self showAlert]; timerFlag = true; [self.accArray removeAllObjects]; return; } } [self.accArray removeAllObjects]; timerFlag = true; } </code></pre> <p>Any help will be really appreciated.</p> <p>Thanks</p>
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    1. COThis is exactly what I am looking for as well! Did you ever find a solution?
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    2. CO@sajoo did you ever find a solution to this! Would love to talk about this. My email should be in my profile. Good luck!
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