ExpEYES/C2/Communicating-to-ExpEYES-using-Python/English-timed
From Script | Spoken-Tutorial
Revision as of 16:07, 5 May 2016 by Pratik kamble (Talk | contribs)
| Time | Narration |
| 00:01 | Hello everyone.Welcome to this tutorial on Communicating to ExpEYES using Python. |
| 00:07 | In this tutorial we will learn:
|
| 00:22 | * Measure capacitance and resistance using Plot window & Python
|
| 00:34 | Here I am using,
|
| 00:43 | To follow this tutorial, you should be familiar with:
ExpEYES Junior interface. Basic Python programming. |
| 00:52 | If not, for relevant tutorials, please visit our website. |
| 00:56 | Let's begin with introduction to Python. |
| 01:00 | Python is simple and easy to learn powerful programming language.
|
| 01:15 | Let's make sure that Python is installed on our system. |
| 01:18 | Press CTRL+ ALT and T keys to open the Terminal. |
| 01:22 | To start Python interpreter type python and press Enter.Details regarding default version of Python will be displayed on the Terminal. |
| 01:36 | The displayed three angle brackets indicate Python prompt(>>>).Now you are ready to type commands. |
| 01:44 | For more details about Python programming, please visit our website. |
| 01:49 | I will discuss about the channels on the top Panel of the device. |
| 01:54 | On the top Panel each terminal is assigned to a specific channel number. |
| 02:00 | For example channel 1 is assigned to A1 and channel 2 to A2. |
| 02:07 | I will show how to connect wires to the device. |
| 02:11 | Device has screw terminals on either side. |
| 02:15 | To make the connection, we insert wires into the terminals and tighten the screws.Here A2 is connected to SINE. |
| 02:22 | This is the circuit diagram. |
| 02:28 | Let's perform an experiment to measure the voltage of A2 and show its Sine wave. |
| 02:36 | Let's see the result on the Plot window. |
| 02:39 | On the Plot window, click on A2 to display the voltage of A2.Voltage of A2 is displayed below. |
| 02:48 | Click on A2 and drag to channel CH1. When we drag A2 to CH1, input data of A2 is assigned to CH1. |
| 02:59 | Move the msec/div slider to show the Sine wave.Click on A2 to show change in voltages of A2. |
| 03:09 | Click on CH1 and drag to FIT. The voltage and frequency of A2 are displayed on the right. |
| 03:16 | We will perform the same experiment and measure voltage of A2 using Python. |
| 03:23 | Please note to avoid errors on Python interpreter:
|
| 03:31 | To import eyes library from ExpEYES,type at the prompt import expeyes.eyesj press Enter. |
| 03:40 | Type p=expeyes.eyesj.open() and press Enter.open() function returns an object if hardware is found. |
| 03:53 | These lines will load the ExpEYES library and establish connection to the device. |
| 03:58 | To view the voltage of A2, type print p.get_voltage within brackets 2 and press Enter. |
| 04:08 | Output shows voltage of A2 Similarly, we can show the various voltages of A2. |
| 04:15 | Voltage of A2 changes as it is an AC voltage. |
| 04:20 | To generate plots using Python interpreter:
Install python-matplotlib library using Synaptic Package Manager. |
| 04:30 | I have already installed python-matplotlib library on my system. |
| 04:36 | To generate plots on Windows Operating system: |
| 04:40 | Download and install,
|
| 04:49 | Copy the installed ExpEYES files and drivers and paste in C drive. |
| 04:55 | To generate Sine wave, at the python prompt,Type import expeyes.eyesj and press Enter. |
| 05:05 | Type p=expeyes.eyesj.open() and press Enter as before. |
| 05:12 | Type from pylab import *(asterisk).from pylab import * is a program from matplotlib library.Press Enter. |
| 05:26 | Type ion() .This command sets pylab interactive mode.
Press Enter. |
| 05:35 | Type t,v=p.capture within brackets 2,200,100.
“t,v are time and voltage vectors. |
| 05:50 | 2 is channel number for A2, 200 is the number of data points,100 is a time interval between subsequent measurements. |
| 06:02 | Press Enter |
| 06:04 | To view the output, type plot within brackets t,v plot within brackets t,v generates a Sine wave on a new window. |
| 06:15 | Press Enter. |
| 06:18 | We can generate a Sine wave, using the above commands on Windows command prompt, as well. |
| 06:26 | Next, let's measure voltage of A1 using a battery as an external voltage source. |
| 06:32 | To measure external voltage source, Ground(GND) is connected to A1 through a battery of 3V. |
| 06:39 | This is the circuit diagram.We will show the value of A1 using Python interpreter. |
| 06:46 | At the python prompt:
Type import expeyes.eyesj, press Enter. |
| 06:53 | Type p=expeyes.eyesj.open(), and press Enter. |
| 06:59 | Type print p.get_voltage within brackets 1 and pressEnter. |
| 07:07 | Here Channel 1 is assigned to A1.Voltage of A1 is displayed on the terminal. |
| 07:14 | let's measure voltage of A1 using PVS as internal voltage source. |
| 07:20 | In this experiment PVS is connected to A1. |
| 07:24 | This is the circuit diagram. |
| 07:28 | Back to the terminal.Type print p.set_voltage within brackets 3 and press Enter. |
| 07:39 | Here voltage of PVS will be set to 3 volts.Voltage of PVS is displayed. |
| 07:47 | Type print p.get_voltage(1) and press enter voltage of A1 is displayed on the terminal |
| 07:45 | Now I will demonstrate AC and DC components of a voltage using capacitor and resistor.And also 'generate a square wave. |
| 08:11 | In this experiment
|
| 08:25 | This is the circuit diagram. |
| 08:27 | Let's see the result on the Plot window |
| 08:31 | On the Plot window click on Measure C on IN1 button. |
| 08:36 | Capacitance of IN1 is displayed as -0.6pF(pico farads). |
| 08:42 | Click on Measure R on SEN button.Resistance of SEN is displayed as 560Ω(ohms) |
| 08:51 | Please note you may get slightly different values of Capacitance & Resistance. |
| 08:57 | Click on SQ1 and drag to CH1.
SQ1 is assigned to channel CH1. |
| 09:04 | Click on A2 and drag to CH2.
A2 is assigned to channel CH2. |
| 09:12 | Click on SQR1 check box to show the Square waves.Move the msec/div slider to adjust the waves. |
| 09:23 | Click on CH2, drag to FIT.Voltage and frequency of A2 is displayed on the right side. |
| 09:32 | We will perform the same experiment to:
|
| 09:41 | At the python prompt:
Type import expeyes.eyesj and press Enter. |
| 09:50 | Type p=expeyes.eyesj.open() and press Enter. |
| 09:58 | To display the Capacitance value:
Type p.measure_cap( ) and press Enter. |
| 10:07 | Capacitance value is displayed on the terminal. |
| 10:11 | To display the Resistance value:Type p.measure_res() and press Enter.
Resistance value is displayed on the terminal. |
| 10:24 | To generate a Square wave:Type from pylab import *(asterisk) and press Enter.
Type ion() and press Enter. |
| 10:36 | Type print p.set_sqr1 within brackets 100 and press Enter.Here 100 is the frequency of the square wave. |
| 10:49 | Type t,v=p.capture within brackets 6,400,100 and press Enter. |
| 11:00 | Type plot within brackets t,v.plot within brackets t,v generates a square wave on a new window. |
| 11:12 | Press Enter. |
| 11:14 | Let's summarize. |
| 11:17 | In this tutorial we have learnt
|
| 11:33 | Measure capacitance & resistance using Plot window & Python
|
| 11:45 | As an assignment,
|
| 11:56 | Show circuit diagrams for the above experiment. |
| 11:59 | This video summarises the Spoken Tutorial project.If you do not have good bandwidth, you can download and watch it. |
| 12:07 | We conduct workshops using SpokenTutorials and give certificates. Please contact us. |
| 12:13 | The Spoken Tutorial Project is funded by NMEICT, MHRD Government of India. |
| 12:20 | This tutorial is contributed by Kaushik Datta and Madhuri Ganapathi..Thank you for joining. |
