Let's look at what each of these terms mean: The ADC0831 is an integrated circuit referred to as an 8-bit analog to digital converter (A/D converter) with synchronous serial output. The ADC0831 Integrated Circuit - An 8-bit Analog to Digital Converter The three resistors can be viewed as a single resistance whose value is: Three resistors in series are shown below. Resistors in Series: A chain of resistors connected end to end. So, the voltage we measure might be 1.234 volts or 3.857564… volts, or 4.9999… volts, etc. We will use our DVM to sample voltages over a continuous range, from 0 to 5 volts. When a source of voltage varies over a continuous range, it is considered an analog voltage. The DVM will then be used to measure samples from the pot’s continuous range of voltage outputs.Ĭontinuous range: A minimum value, a maximum value, and everything in between. A pot will be wired to the Board of Education and adjusted to make analog output voltage. In this experiment, we will make a DVM using the BASIC Stamp together with the ADC0831 integrated circuit. It describes the analog information with binary numbers for devices that process binary information, such as the BASIC Stamp. The ADC0831 is a common integrated circuit that does this job. We'll use the potentiometer as we did in Chapter #1 to make a range of voltages that can vary continuously between 0 and 5 volts on the Board of Education.Īlthough information about analog voltage can be processed efficiently with binary devices, the voltage has to be sampled and described using binary numbers first. As a “continuously variable value”, analog voltage varies within a continuous range. In Chapter #1, we used an LED circuit to display changes in analog voltage level applied to a circuit. Since our DVM processes its measurements in binary, we'll start with a binary display and then modify it to the more conventional and easy to read decimal display. Making sense out of each measurement would be time consuming. It would still be a "digital" voltmeter, but it would have binary display instead of a decimal display. The digits 0 through 9 and a decimal point are used to display the voltage measurements as decimal values. A common use for a DC DVM is testing the voltage (potential) between the two terminals on a battery.Ī digital voltmeter is so named because it displays its measurements with digits. In this experiment, we will build a DVM for measuring DC voltage in the 0 to 5 volt range. Chapter 3: Basic Analog to Digital Conversion Ĭhapter #3: Basic Analog to Digital ConversionĪ digital DC voltmeter (DC DVM) is a handy tool for measuring voltage between two contact points.
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