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Occasionally, a pull up resistor is required when interfacing many sensors and electronics to the BrainStem.  The BrainStem GP 2.0 has simplified options to make adding additional electronics significantly easier.  Two approaches, using different circuitry components, are available for both digital and analog pins. 

Using Through Hole Components

The built in BrainStem prototyping area has ample space to wire in many different electronic components.  Some through holes are connected to commonly used input and output pins.  These connected holes are selected for interfacing convenience.  The following image demonstrates adding a 1kohm resistor pull up to the Digital 1 IO pin. 

Through hole resistor is soldered into the prototyping area.

Using Surface Mount Components

The BrainStem 2.0 underside has resistor pads (size 0603) for every analog and digital pin.  The pads are connected on one side to VCC.  Once a resistor is soldered to the pad, the corresponding pin will get pulled up to VCC.  The following image demonstrates adding a 1kohm 0603 resistor to Digital 1 IO pin. 

A 0603 package surface mount resistor is soldered to the underside of the BrainStem GP 2.0.

Revision History:

• 2008-06-12: How To: Adding Pull-Up Resistors

Related Links:

How To: Connecting a Switch or Button

Related Examples:

Interface between SensComp 6500 Ranging Module and BrainStem GP Example