28128 Parallax Inc, 28128 Datasheet - Page 12

• Manufacturer Part Number: 28128
• Description: KIT BASIC ANALOG/DIGI PARTS ONLY
• Manufacturer: Parallax Inc

Specifications of 28128

• Accessory Type: ADC, DAC
• Product: Microcontroller Accessories
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The analog voltage will also be connected to one of the BASIC Stamp I/O pins set to
input mode. This binary input can actually be used to measure small variations in the
analog voltage. PBASIC will be used to program the BASIC Stamp to drive a binary
LED circuit, which will indicate when these variations have been detected.
The Debug Terminal is also a useful tool for displaying data the BASIC Stamp collects
and sends. It will be used to monitor the binary value that the input pin receives as the
analog voltage is varied.
Parts Required
For each experiment you will need a BASIC Stamp 2 and a Board of Education
connected to an IBM-compatible PC with Win95/98/NT4.0. You will need to install the
BASIC Stamp Editor v 2.0 or higher, which is available for free download from
www.parallax.com or on the Parallax CD dated May 2003 or later. In addition, you'll
need the following parts for this experiment:
(2) 470
(2) Red LEDs
(1) 100 k potentiometer.
(6) Jumper wires.
(1) LM358 op-amp
Throughout this series of experiments, we will build circuits from circuit schematics.
One of the keys to learning how to read circuit schematics is learning what each symbol
on the schematic means. It's also important to learn how to connect a part from the
Volt/Voltage: The volt is a fundamental unit of electrical measurement named after 18th
century physicist Allesandro Volta, and a measurement in volts is referred to as voltage.
Most of us encounter this unit of measurement when buying batteries such as the 9 volt
(DC) battery that can be used to power the Board of Education. Inside a battery there are
two chemical reactions, which are separated from each other by a barrier. One of the
reactions creates a surplus or electrons and the other creates a shortage of them.
The electron surplus and shortage sides of the barrier are connected to the negative and
positive terminals of the battery respectively. If given a pathway around the barrier, the
electrons have the potential to do work to get from the negative to the positive terminal. The
volt is a measure of this potential to do work. The volt is also referred to as a unit of electric
potential.
resistors