Transcript Arduino Week 2 Lab

Arduino
Week 3 Lab
ECE 1020
Prof. Ahmadi
Objective
Data
acquisition
(DAQ)
is
the
process
of
measuring an electrical or physical phenomenon
such as voltage, current, temperature, pressure, or
sound with a computer. A DAQ system consists of
sensors,
DAQ
measurement
hardware,
computer with programmable software1.
and
a
What Is a DAQ Device?
DAQ hardware acts as the interface between a computer
and signals from the outside world. It primarily functions as
a device that digitizes incoming analog signals so that a
computer can interpret them. The three key components
of a DAQ device used for measuring a signal are the signal
conditioning circuitry, analog-to-digital converter (ADC),
and computer bus. Many DAQ devices include other
functions for automating measurement systems and
processes. For example, digital-to-analog converters
(DACs) output analog signals, digital I/O lines input and
output digital signals, and counter/timers count and
generate digital pulses.
Schematic of a DAQ
System
http://www.ni.com/data-acquisition/what-is/
In Today Lab:
1. We are going to connect the light sensor to
Arduino UNO board to capture data
1. Transfer the captured data to a computer
1. Analyze and plot the data on computer
using MATLAB
DAQ components must
be able to communicate
For each and every two systems to communicate,
they must speak the same language (protocols). For
example in today’s lab experiment,
o Arduino board must communicate with MATLAB on the computer
through a known setup protocol
o We upload a program on Arduino (adioes) ,which tells the
Arduino board to listen for communication coming from MATLAB
under defined terms and conditions
o MATLAB is programed with a code (arduino) , which know how to
communicate with adioes on the Arduino board
o Once the connection is established data can be transferred from
Arduino to MATLAB, analyzed, and visualized.
1. Light Sensor
Connect the light sensor to the Arduino UNO board as
depicted in the
How to read a light sensor
[How to connect it?]
• The sensor is connected in series with a resistor
• Both of which are between the +5V terminal of the
Arduino and the Ground terminal
• They form a Voltage Ladder
• The data we want comes from the voltage at the
point of connection between the sensor and resistor
[This is what will change in response to light]
Layout
2. Program the Arduino
• Program the Arduino
with the adioes.pde in
the …/pde directory.
• Make sure you have
chosen the right COM
port and Arduino
board (Arduino UNO).
• If programmed
successfully, close the
Arduino IDE software.
3. MATLAB
• Open MATLAB
• Select the …/Arduino_Lab_3 as your working directory
• Open the arduino_lab_3.m code file
• Replace the ‘COM3’ with the port your Arduino is
connected to on line 11 of the code
• Replace 4 on line 14, val(i,1)=OBJ.analogRead(4) with the
input port your light sensor in connected to
• Run the Script!
Sample Output Plot
Other Input Signals
You can use any other input signal with
amplitude in the range 6~20 Volts ( 7~12
Recommended) like,
o
o
o
o
Light Sensor
Sonar Sensor
Signals generated using a Fucntion Generator
Etc.
Reference
•
What Is Data Acquisition? - National Instruments
www.ni.com/data-acquisition/what-is/