Texas Instruments Calculator-Based Ranger CBR 2

Date of introduction:  2004  Display technology:  
New price:  $130.00 Display size:  
Size:  6.0" x 2.3" x 1.7"
 152 x 58 x 43 mm³
Weight:  6.0 ounces, 169 grams Serial No:  1701000082
Batteries:  4*AA Date of manufacture:  mth 04 year 2003
AC-Adapter:   Origin of manufacture:  China (S)
Precision:   Integrated circuits:  
Program steps:   Courtesy of:  Joerg Woerner 

CBR2_1.jpg (237186 Byte)The CBR 2 Calculator-Based Ranger™ replaced the CBR introduced already in 1997. It added a USB interface to connect directly with the TI-84 Plus family calculators while maintaining the serial port for the TI-73, TI-73 Explorer, TI-82, TI-83, TI-83 Plus, TI-83 Plus Silver Edition, TI-85, TI-86, TI-89, TI-89 Titanium, TI-92, TI-92 Plus and Voyage 200.  

CBR2_PCB.jpg (193084 Byte)CBR2_PCB2.jpg (49698 Byte)The CBR 2 uses a sonic sensor to measure the time between transmitting a short ultrasonic pulse and receiving the first returned echo. The built-in microprocessor calculates the distance of the object in the range between 0.15 m (0.5 ft) and 6 m (20 ft) by doing a speed-of-sound calculation with a maximum of 200 samples per second. Then it computes the first and second derivatives of the distance data with respect to time to obtain velocity and acceleration data. Up to 512 data points are stored in lists and transferred under program control to one of the graphing calculators.

Connectivity, User Interface: The CBR 2 features a huge variety of connectors and switches to the outside world:

Serial port to connect to graphing calculators
USB port to connect to TI-84 Plus family
Port to connect to CBL / CBL 2
[TRIGGER] button to initiate sampling
[SENSITIVITY] switch for Normal and Track mode

The CBR 2 being marketed by Texas Instruments was developed as part of an ongoing business alliance between TI and Vernier Software of Portland, Oregon.


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© Joerg Woerner, April 24, 2008. No reprints without written permission.