Resistor Networks/Multimeter

Overview

In this lab, you will:

• Learn to measure resistance, voltage, and current with a Fluke 87V multimeter.
• Utilize your understanding of circuit analysis to compute voltages, currents, and resistances in a circuit.

Preparation for Lab

• Overview of Fluke 87V multimeter

Resources

• STM32F303RE Data Sheet
• Digital to Analog Conversion

Setup

• Collect the following parts from the course instructors
  • Fluke 87V Multimeter
  • Breadboard
  • Resistor Kit
  • Nucleo-F303RE Board

Building a Programmable Voltage Source

In this section you will be using the Digital to Analog Converter on the STM32F303 to generate a programmable voltage. At this point, it is not essential that you have a complete understanding of Digital-to-Analog conversion. It will suffice for you to understand that the CPU can write 12-bit value to D2A peripheral.

To determine the voltage that will be written, you can use the following relationship.

Vout = (register value/4096)*Vreference

The default value for Vreference on the nucleo boards is 3.3V. The register value is the 12-bit number that you are trying to write out.

Starting with an example.

When you create a new project, there is an option to use a template. Use the template to "Output a sinewave using DAC". Experiment with this example until you understand how to create a DC voltage of a value that you choose. In this example, the voltage will be presented the pin labled A2 on the 6 pin arduino connector. This is connected to pin PA_4 on the STM32F303 processor.

Creating a command to control the voltage.

Augment your LED command program from lab 1 to include the following new command:

• DC Voltage: The command DC takes one argument - the desired voltage. Voltage can range from 0.50V-3.00V. Your program should convert this number into a voltage. Utilize the multimeter to calibrate your solution.

Resistor Networks

Circuit 1

• V1 = 2.5V
• R1 = 1k
• R2 = 2.2k

Circuit 2

• V1 = 2.1V
• R1 = 1k
• R2 = 2.2k
• R3 = 10k
• R4 = 470
• R5 = 1.5k

Scoring

The submission deadline is before your lab on Friday. "Publish" your team's "Lab2" program to the CPS-Labs team.

• Lab Report (report.txt) [Create one report for your team as a file in your Lab1 program]

  • Results [5]
  • Difficulties [5]
  • How closely did your analysis match your measurements. What were the reasons for the differences? [30]
  • SUB-TOTAL [40]

• Control Program

  • DC Command [20]
  • SUB-TOTAL [20]:

• Resistor Networks

  • Circuit 1 Ideal Analysis [10]
  • Circuit 1 Measurements [10]
  • Circuit 2 Ideal Analysis [10]
  • Circuit 2 Measurements [10]
  • SUB-TOTAL [40]:

• TOTAL [100]: