Component: Ultrasonic (HCSR04) (Audio)

Author	Matrix TSL
Version	1.0
Category	Audio

Ultrasonic component

This board has both an ultrasonic transmitter and receiver. When the Trig pin is set high for 10uS, the transmitter sends eight 40KHz pulses. The Echo pin goes high about 2ms later. The duration of the Echo pin is measure when it goes high, and a distance is then calculated based on the high duration. The distance of objects in a range of around 3cm to 2.75m can be determined.

Detailed description

No detailed description exists yet for this component

Examples

HC-SR04 Distance Sensor Demo.fcfx

Macro reference

GetDistance

	GetDistance
Sends a pulse and processes the echo. Returns a object distance in cm
- UINT	Return

Property reference

	Properties
	Type

	Use Timer Interrupt
For 8bit PICs resuls the timer interrupt is recomened for increased accuracy
	OutputTrig Pin
Pin used for controlling the output pulse
	Input Echo Pin
ADC channel used to monitor the echo
	Rollover Time
Maximim rollover time in seconds. Make sure its the lowest value posisble without going below 0.018 0.018 = 18ms which equates to a distance of 310 cm
	Timer Settings
	Timer
Timer Peripheral to use to monitor the passage of time.
	Bit Depth
Number of bits in the timer peripheral. 8-bit timers can count from 0-255 before overflowing. 16-bit timers can count from 0 to 65535 before overflowing.