28128 Parallax Inc, 28128 Datasheet - Page 90

• 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

Figure 4-6 shows the output. Try that with a hand held voltmeter and you’ll begin to see
the usefulness of combining the BASIC Stamp with analog interfaces. Imagine trying to
test all 4096 levels of a 12-bit DAC one at a time!
This is a very efficient way to collect your voltage sweep data. Looking at the data for the
voltage sweep brings several things to light. First, the voltage output for the D/A
converter is always a little high. Second, the error increases as the output voltage
Figure 4-6
Debug Terminal
Sample Output for
Program Listing 4.1,
Revision 3.