Radio Shack Mobile Robot manual Digital Inputs, Sensor Input Example, Switch Input Example

Expansion Port Circuit Examples continued

Digital Inputs -

Basic Stamp input signals can be used to read TTL level signals such as switches or sensors. The input signal should not exceed +5 volts DC or go below 0 volts. Each input pin has a pull-up resistor to +5 volts.

Sensor Input Example:

This example shows how to interface a sensor that has an open collector (OC) output to a digital input.

Switch Input Example:

This example shows how to interface a mechanical switch to one of the digital

Digital Circuit Input Example:

This example shows how to attach logic gates to the digital input signals.

Digital/Power Output -

The digital signals can be used to control external circuitry. Large loads can be driven with an external power transistor such as a MOSFET. A clamping diode should be included to protect the transistor when switching inductive loads such as relays.

Digital Output Example Power Output Example

More expansion information

Our space is limited here so make sure to visit our web site for the latest expansion application notes complete with program examples. www.robotics.com/arobot/projects.html

Also visit the Parallax web site which has an entire section dedicated to application notes for the Basic Stamp II. www.parallaxinc.com

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