Acrob015 - História úprav

Balogh na 09:54, 19. apríl 2011

2011-04-19T09:54:52Z

← Staršia verzia		Verzia z 09:54, 19. apríl 2011
Riadok 34:		Riadok 34:
	The Ping sensor measures distance using sonar; an ultrasonic (well above human hearing) pulse is transmitted from the unit and distance-to-target is determined by measuring the time required for the echo return. Output from the PING))) sensor is a variable-width pulse that corresponds to the distance to the target.		The Ping sensor measures distance using sonar; an ultrasonic (well above human hearing) pulse is transmitted from the unit and distance-to-target is determined by measuring the time required for the echo return. Output from the PING))) sensor is a variable-width pulse that corresponds to the distance to the target.

	[[Obrázok:SensorPingOperation.png\|center\|450px]]		[[Obrázok:SensorPingOperation.png\|center\|450px]][[Obrázok:SensorPingUS_Cone.png\|center\|350px]]

	The PING))) sensor detects objects by emitting a short ultrasonic burst and then "listening" for the echo.		The PING))) sensor detects objects by emitting a short ultrasonic burst and then "listening" for the echo.

2011-04-19T09:52:46Z

Example program

← Staršia verzia		Verzia z 09:52, 19. apríl 2011
Riadok 47:		Riadok 47:

	<source lang="c">		<source lang="c">
	int pingPin = 10;		int pingPin = 11;

	void setup()		void setup()
Riadok 112:		Riadok 112:
	'''Returns'''		'''Returns'''

	the length of the pulse (in microseconds) or 0 if no pulse started before the timeout (unsigned long)		the length of the pulse (in microseconds) or 0 if no pulse started before the timeout (unsigned long)



	== Connection ==		== Connection ==

2011-04-19T09:52:17Z

← Staršia verzia		Verzia z 09:52, 19. apríl 2011
Riadok 41:		Riadok 41:
	sensor provides an output pulse to the host that will terminate when the echo is detected, hence the		sensor provides an output pulse to the host that will terminate when the echo is detected, hence the
	width of this pulse corresponds to the distance to the target.		width of this pulse corresponds to the distance to the target.
	[[Obrázok:SensorPingTiming.png\|~~center~~]]
			[[Obrázok:SensorPingTiming.png\|right]]

	== Example program ==		== Example program ==

2011-04-19T09:51:50Z

@@ Riadok 42: / Riadok 42: @@
 width of this pulse corresponds to the distance to the target.
 [[Obrázok:SensorPingTiming.png|center]]
 == Example program ==
@@ Riadok 121: / Riadok 114: @@

2011-04-19T09:50:52Z

@@ Riadok 49: / Riadok 49: @@
 Example program
 <source lang="c">
-#include <stdio.h>
+void loop()
 </source>

2011-04-19T09:46:34Z

Air Temperature

← Staršia verzia		Verzia z 09:46, 19. apríl 2011
Riadok 64:		Riadok 64:
	Changing environmental conditions are the main source of the differences. Many quantities influences measurement		Changing environmental conditions are the main source of the differences. Many quantities influences measurement
	including temperature, humidity, turbulences, pressure and damping. Main source of error is air circulation and		including temperature, humidity, turbulences, pressure and damping. Main source of error is air circulation and
	temperature. Many equations appears in literature, two of them are mentioned here:		temperature. Many equations appears in literature, two of them are mentioned here:<BR>

	<math>		<math>
	(1) \qquad c = c_0 ( 1 + \gamma \vartheta )( 1 + A_V \eta )		(1) \qquad c = c_0 ( 1 + \gamma \vartheta )( 1 + A_V \eta )
Riadok 77:		Riadok 76:
	* <math>\vartheta</math> - air temperature [°C].		* <math>\vartheta</math> - air temperature [°C].

	For practical purposes we can abandon humidity influences and then simplified formula applies:		For practical purposes we can abandon humidity influences and then simplified formula applies:<BR>
	<math>		<math>
	(2) \qquad c = c_0 + 0,6 \vartheta [m/s]		(2) \qquad c = c_0 + 0,6 \vartheta [m/s]

2011-04-19T09:46:04Z

Air Temperature

← Staršia verzia		Verzia z 09:46, 19. apríl 2011
Riadok 77:		Riadok 77:
	* <math>\vartheta</math> - air temperature [°C].		* <math>\vartheta</math> - air temperature [°C].

	~~Pre praktické účely môžeme vplyv vlhkosti prostredia na zmenu rýchlosti zvuku zanedbať, pretože je~~		For practical purposes we can abandon humidity influences and then simplified formula applies:
	~~v porovnaní s vplyvom teploty omnoho menší. Dostávame tak zjednodušený, numericky menej~~		<math>
	~~náročný vzťah pre korekciu rýchlosti, ktorý je daný nasledovne~~		(2) \qquad c = c_0 + 0,6 \vartheta [m/s]
			</math>
	~~c=c00.6 .~~ (2)

	~~Another (easier) formula is:~~

	~~Cair~~ = ~~331.5~~ +(0~~.6× TC)~~m/s

	The percent error over the sensor’s operating range of 0 to 70 ° C is significant, in the magnitude of 11		The percent error over the sensor’s operating range of 0 to 70 ° C is significant, in the magnitude of 11

2011-04-19T09:43:17Z

Air Temperature

← Staršia verzia		Verzia z 09:43, 19. apríl 2011
Riadok 67:		Riadok 67:

	<math>		<math>
	c = c_0 ( 1 + \gamma \vartheta )( 1 + A_V \eta )		(1) \qquad c = c_0 ( 1 + \gamma \vartheta )( 1 + A_V \eta )
	</math>		</math>

	~~<math>a^3 + b^4 = c^5</math>~~
	~~<math>\sum_{i=1}^n = \frac{n(n+1)}{2}</math>~~
	~~<math>\sqrt{1-e^2}</math>~~

	where		where
	c0 - speed of the sound at 0° C and 0% RH (c0 = 331.5 [m.s-1]),		* <math>c_0</math> - speed of the sound at 0° C and 0% RH (c0 = 331,5 [m/s]),
	γ - ~~teplotný koeficient rýchlosti šírenia~~ (~~okolo~~ 0° C), γ = 1.83 10-3 [°C-1],		* <math>\gamma</math> - temperature coefficient of the speed (@ 0° C), γ = 1.83 10-3 [°C-1],
	AV - ~~vlhkostná konštanta~~ (~~medzi 50 ÷ 200 kHz),~~ AV = 2.2 10-4,		* <math>A_V</math> - humidity constatnt (AV = 2,2 . 10^-4, for 50 ÷ 200 kHz),
	η - ~~relatívna vlhkosť vzduchu~~ [%],		* <math>\eta</math> - relative humidity of air [%],
	 - ~~teplota vzduchu~~ [°C].		* <math>\vartheta</math> - air temperature [°C].

	Pre praktické účely môžeme vplyv vlhkosti prostredia na zmenu rýchlosti zvuku zanedbať, pretože je		Pre praktické účely môžeme vplyv vlhkosti prostredia na zmenu rýchlosti zvuku zanedbať, pretože je

2011-04-19T09:39:57Z

Air Temperature

2011-04-19T09:39:37Z

← Staršia verzia		Verzia z 09:39, 19. apríl 2011
Riadok 66:		Riadok 66:
	temperature. Many equations appears in literature, two of them are mentioned here:		temperature. Many equations appears in literature, two of them are mentioned here:

	c=~~c011AV ~~ (1)		<math>
			\begin{equation}
			c = c_0 ( 1 + \gamma \vartheta )( 1 + A_V \eta )
			\end{equation}
			</math>

			<math>a^3 + b^4 = c^5</math>
			<math>\sum_{i=1}^n = \frac{n(n+1)}{2}</math>
			<math>\sqrt{1-e^2}</math>

	where		where
	c0 - speed of the sound at 0° C and 0% RH (c0 = 331.5 [m.s-1]),		c0 - speed of the sound at 0° C and 0% RH (c0 = 331.5 [m.s-1]),