1. Ultrasonic Sensor HC-SR04
Ernie Patenia
Tori Speer-Manson

2. Introducing...
4 Pins
Vcc (5-20 [V])
Trig
Echo
Gnd

3. Outline SR04 Timing Diagram Organization of Timers
TI RTOS Timers and HWI
Timer MUX Pins
Interrupt Vector Sheet

4. SR04 Timing Diagram

5. Organization of Timers
WTimer 2
Timer A
Timer B
Timer 3
15 μs trigger (pulse)

6. Timer MUX Pins Wide Timer

7. Interrupt Vector Sheet*

8. TI RTOS Timers
Trigger Timer

9. TI RTOS Timers
Echo Timer

10. Now for a short demonstration…
TI RTOS HWI
Hardware Interrupt
Now for a short demonstration…

11. Questions