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Full USB-I2C Documentation

The USB-I2C module is a low cost USB to I2C module, with a simple command set, and interfacing to any I2C device.

The USB-I2C module provides a complete interface between your PC and the I2C bus. The module is self powered from the USB cable and can supply up to 70mA at 5v for external circuitry from a standard 100mA USB port.

I2C Devices - Any registered or unregistered I2C device.
Host support - Drivers available for Windows XP64, XP, 2000, ME, 98, CE.NET V4.2, Linux, Mac OS8, OS9, OSX.
Voltage - Self powered - 5v available
Current - Up to 70mA available for your own circuits
On-board Pull-up resistors - 4.7k
Digital I/O - 1 Input and 2 I/O available when not using I2C.
Analogue Input - 2 10-bit channels available when not using I2C.

Lowest cost ultrasonic ranger with both I2C and Serial interfaces. New AutoTune algorithms intelligently back the minimum range right up to the transducer ringdown for the very best performance possible, automatically, in the background, and with no calibration cycles necessary. Additional new commands allow for separate burst and ranging control.

SRF02
Range - 16cm to 6m.
Power - 5v, 4mA Typ.
Frequency - 40KHz.
Size - 24mm x 20mm x 17mm height.
Analogue Gain - Automatic 64 step gain control
Connection Modes
1 - Standard I2C Bus.
2 - Serial Bus - connects up to 16 devices to any uP or UART serial port
Full Automatic Tuning - No calibration, just power up and go
Timing - Fully timed echo, freeing host controller of task.
Units - Range reported in uS, mm or inches.
Light Weight - 4.6gm

SRF05
Range - 1cm to 4m.
Power - 5v, 4mA Typ.
Frequency - 40KHz.
Size - 43mm x 20mm x 17mm height.

Two operational modes are available, Single pin for trig/echo or 2 Pin SRF04 compatible.

The input Trigger is a 10uS Min. TTL level pulse
Echo Pulse is Positive TTL level signal, with the width proportional to the object range.
Full Technical Documentation

Full Technical Data, and the Compass FAQ


Many examples available for popular controllers.







Voltage - 3.3v-5v only required
Current - 25mA Typ.
Resolution - 0.1 Degree
Accuracy - Horizontal, 3-4 degrees.
Accuracy - Tilted to +/- 60 degrees, 4-5 degrees
Output 1 - I2C Interface, SMBUS compatible, 0-255 and 0-3599 , 100khz
Output 2 - Serial port, 9600 baud, no parity, 2 stop bits and 3.3v-5v signal levels
Output 3 - Timing Pulse 1mS to 37mS in 0.1mS increments
Small Size - 24mm x 18mm

A strong aluminum mounting bracket for the EMG30 motors.

Designed to work with our EMG30 gear motors, the MD25 will drive two motors.
Controllled by Serial or the I2C Interface.
Two modes of operation, direct individual control of the motors or the ability to send a speed and a turn commands.

Full MD25 Documentation

Voltage - 12v only. The 5v for the logic supplied from an on-board regulator, 300mA available for your own circuits.
Current - Up to 2.8A for each motor.
Encoder - Processes quadrature encoder inputs from motor. 360 counts per wheel turn when used with the EMG30.
Size - 110mm x 52mm x 25mm

A complete Robot Drive system, ready to integrate into your robot, comprising of an MD25 motor drive module, two EMG30 gearmotors with encoders, two mounting brackets, two 100mm wheels with hubs already fitted. Screws to fit the motors to the brackets and a hex key for the hub screw is included. Only a single 12v battery capable of supplying peak current of 6Amps is required to power the system. Power for the logic comes from an on-board 5v regulator which is also capable of supply up to 300mA to your own circuits.
Full MD25 Documentation and the EMG30 Specification

USB-RS485 Documentation

The USB-RS485 is a complete, self powered, USB to RS485 interface working at any baud rate up to 250k baud. It features automatic bus turn-around - any time your not transmitting the module is listening.
Uses the MAX487 quarter power tranceiver, so you can have up to 128 devices on the bus.


USB interface uses the FTDI chip which has drivers available for Windows XP64, XP, 2000, ME, 98, CE.NET V4.2, Linux, Mac OS8, OS9, OSX.

Power Requirement - Powered from USB port
Requires USB drivers for the FT232R, available from the FTDI website for MacOS, Linux and Windows.
Direct Connection - to BrainStem and CMUcam2+
4 pin connector - GND, Logic out (STX), +5v, Logic In (SRX)

Full LCD03 Documentation

Display - 20 characters per row, 4 rows
Voltage - 5v only required
Current - 280mA typ. with backlight on
Modes - I2C or 9600 baud Serial
Keypad - Automatic scanning of a 3x4 matrix keypad
Custom characters - up to 8 custom characters easily defined

Backlight defaults off, and can be turned on under software control