Sensor Ping

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For English
Parallax's PING)))™ ultrasonic sensor provides a very low-cost and easy method of distance measurement. This sensor is perfect for any number of applications that require you to perform measurements between moving or stationary objects. Naturally, robotics applications are very popular but you'll also find this product to be useful in security systems or as an infrared replacement if so desired. You will definitely appreciate the activity status LED and the economic use of just one I/O pin.
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.
Interfacing to the BASIC Stamp and Javelin Stamp microcontrollers is a snap: a single (shared) I/O pin is use to trigger the Ping sensor and "listen" for the echo return pulse. And the  intelligent trigger hold-off allows the PING)))™ to work with the BS1! An onboard three-pin header allows the PING))) to be plugged into a solderless breadboard (on a Boe-Bot, for example), and to be connected to its host through a standard three-pin servo extension cable.
Features:
  • Provides precise, non-contact distance measurements within a 2 cm to 3 m range
  • Simple pulse in/pulse out communication
  • Burst indicator LED shows measurement in progress
  • 20 mA power cosumption
  • Narrow acceptance angle
  • 3-pin header makes it easy to connect using a servo extension cable, no soldering required
Key Specifications:
  • Power requirements: +5 VDC
  • Communication:Positive TTL pulse
  • Dimensions: 0.81 x 1.8 x 0.6 in (22 x 46 x 16 mm)
  • Operating temp range: +32 to +158 °F (0 to +70 °C)


For Indonesian
Sensor jarak ultrasonic PING ialah sensor 40 KHz  produksi parallax yang banyak digunakan untuk aplikasi / kontes robot.  Kelebihan sensor ini ialah hanya membutuhkan  1 sinyal (SIG), selain  jalur 5V dan ground.  Perhatikan gambar di bawah ini.


Sensor PING mendeteksi jarak obyek dengan cara memancarkan gelombang ultrasonik (40 KHz) selama tBURST (200 us) kemudian mendeteksi pantulannya.  Sensor Ping memancarkan gelombang ultrasonic sesuai dengan kontrol dari mikrokontroler pengendali (pulsa trigger dengan tOUT min 2 us).
Spesifikasi sensor ini :
·         Kisaran pengukuran 3cm-3m
·         Input trigger –positive TTL pulse, 2uS min., 5uS tipikal
·         Echo hold off 750uS dari fall of trigger pulse
·         Delay before next measurement 200uS
·         Burst indicator LED menampilkan aktifitas sensor.

Gelombang ini melalui udara dengan kecepatan 344 m/s, lalu mengenai obyek dan memantul kembali ke sensor.  Ping mengeluarkan pulsa output high pada pin SIG setelah memancarkan gelombang ultrasonik dan setelah gelombang pantulan terdeteksi Ping akan membuat output low pada pin SIG. Lebar pulsa High (tIN) akan sesuai dengan lama waktu tempuh gelombang ultrasonik untuk 2x jarak ukur dengan obyek.  Maka jarak yang diukur ialah [(tIN s x 344 m/s) : 2] meter.