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DF12-BBU  DragonflyBot Board with USB port,  fits on the Parallax's BoeBot chassis


Product Code

Price (USD)

Description

DF12P-BBU

DF12P-BBU-C32

DF12P-BBU-C128
$59

$78

$83

DragonflyBot Board with USB port for Dragonfly12 plus module

DragonflyBot Board with USB port and Dragonfly12 plus C32 module

DragonflyBot Board with USB port and Dragonfly12 plus C128 module

Each price includes a USB cable as shown on the above picture.

Application:

Features:

 Options:

 

The board draws insignificant current and can be powered by 5V supply of a USB port.  The voltages for the servos and motors can be brought in via terminal blocks.   

The BBU installed with Dragonfly12 DIP module, LCD display module, TinyBee accelerometer module and the 2nd dual H-Bridge driver SN754410

 

 

The BBU can control 4 servos or 4 DC motors or 2 stepper motors and monitor 4 digital or analog inputs, such as GP2D120 IR sensors.  It also can use a SRF04/SRF05 Sonic Range Finder to detect objects.

Some robots such as the following two can be controlled by the DragonflyBot Board without much external parts: 

http://wwweng.uwyo.edu/electrical/faculty/barrett/68hc12//Robot_Owners_Manual_web.pdf  Controlled by a MiniDragon+ board

http://www.coe.montana.edu/ee/seniordesign/archive/FL07/micromouse_bcp/hardware.html  Controlled by a Dragonfly12 DIP module

The board is pre-installed with serial monitor and a test program.  It comes with a USB cable and it is set for using VCC from USB port. You don't need to connect an AC adapter in order to test the board. 

When the board is plugged into a USB port via the USB cable, it will run the test program if the slide switch S5 is in "up" position ("Run" position).  Press the pushbutton S1 the LED flashing speed will increase, press S2, the speed will decrease.  Press S3 it will display accelerometer's X-Y-Z values on LCD display.  Each count represents 5V/256=19.53mv.

The above pictures show different values in Y- axis when the board is tilted.

On the left:        voltage on Y axis is 099 x 19.53mv =1.93V
On the middle:  voltage on Y axis is 084 x 19.53mv =1.64V
On the right:      voltage on Y axis is 069 x 19.53mv =1.35V

The VCC of the TinyBee-2 module can be 3.3V or 5V.  In analog mode used in BBU, the VCC of the TinyBee-2 module is 3.3V.  In a 3.3V system, 1.65V (half of the 3.3V)  represents zero acceleration or in horizontal position.  When this accelerometer is tilted, the voltage range is between 1.23V to 2.11V. With 19.53mv per count  the count range is 63 to 108.

Not many robots need an accelerometer. In a few applications it can be used for detecting uphill, downhill, or even a flip over.  It's also useful in a wall-climbing robot.

Because the size of BBU is small, the TinyBee module may have more different applications in standalone embedded products where the BBU is used as the controller board.