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PyLab-Basics.php    14618 Bytes    04-08-2022 11:58:11

Python Lab Experiments - Basics

Minimum Equipment List

✈ Software

At the time of writing these lines, Windows® Version 10 is actual. We use Python 3.9.7, Anaconda 3, Spyder 5.1.5 with the PySerial Library installed. PySerial is a Python API module which is used to read and write serial data to Arduino or any other Microcontroller. The Arduino IDE (1.8.13) should also be installed.

✈ Hardware

On the Hardware side, all devices are based on an Arduino / Genuino.
You mayst want to use a USB hub in order to connect several devices. For some experiments, a galvanic isolator for the USB connection is mandatory. You can find such gear in the bay or at Ali. Sometimes, the Amazons may also be helpful.

✈ Find the Arduino - Hello Arduino :-)

If an Arduino is connected to a Computer running Windows 10, the OS stores the information about the used COM port. If the same device is connected at a later time, the same port is used. Therefore it deems useful to create a sticker, noting this magic number on the device.

There are two easy methods in finding that number :

#1 Using the Arduino IDE
#2 Using the Windows Device Manager

RE-open the Serial Monitor to verify that the communication with the device is working. Sometimes a *IDN? command mayst be used to force an answer.

The third method uses a little Python-Script. We call it "Arduino COM-Scanner" and yes, it was strongly inspired by the I2C Scanner :-)

# -*- coding: utf-8 -*-
Created on Thu Jul 21 07:11:19 2022

@author: r_57, cp-9

ETH Zürich, Quantumoptics 2022

import serial
import time

minport = 0
maxport = 99
mod = 'mod'
count = 0

def readempty(x):
        x = b'ava'
        while x != b'':
            x = porttest.readline()

def write_read(x):
    data = []
    line = (porttest.readline())
    while len(line) > 0:
        line = porttest.readline()
        line = line.decode('utf-8')
    return data

while minport <= maxport:
    minport += 1
        porti = COM + str(minport)
        porttest = serial.Serial(port = porti, baudrate=115200, timeout=.1)  
        IDN = str(write_read('*IDN?'))       #who is answering
        while ((IDN == '') or (IDN == '[]')):
            IDN = str(write_read('*IDN?'))
            count += 1
            if count >= 20:                     #ask 10 times
                IDN = 'a'                       #break while Loop
            count = 0
        device = int(IDN.find(mod)) + 3         #remove everything behind name
        IDN = IDN[3:device]
        last = IDN.rfind(' ')          #remove everithing in front of the name
        last = last + 1
        IDN = IDN[last:]
        print('Looks like there is something on ' + porti)
        if IDN == '':

The Result could look similiar to the one below :

Python COM-Scanner

✈ Additional Tools : The Resistor Box

This is a Connectorized Box containing 5 High Power (at least 5W) wirewound resistors. They are 1% in tolerance and specified for Military Use. The closest match to Student Use. They are used mainly for current limiting.

The Resistor Box

 # Component
 1 Aluminum profile housing, height 34 mm, width 65 mm, length 100 mm, (30257.1)
 1 Frontpanel, 0.5 mm, FR4. See Gerber File below
 10 Socket, nickel-plated brass, Ø 4 mm, (30101.13)
 1 HS1010RF - Wirewound Resistor 10W, 10Ω, 1%, Arcol
 1 HS1033RF - Wirewound Resistor 10W, 33Ω, 1%, Arcol
 1 RH010100R0FE05 - Wirewound Resistor 10W, 100Ω, 1%, Vishay
 1 RH005330R0FE05 - Wirewound Resistor 5W, 330Ω, 1%, Vishay
 1 RH0051K000FE05 - Wirewound Resistor 5W, 1kΩ, 1%, Vishay

✈ Additional Tools : The Test Fixture

This is a Connectorized Box containing two Toggle Clamps. This allows for a fast and reliable exchange of the components to be measured. They are pressed down on the gold plated pcb with an adjusteable force. Very repeatable.

The Test Fixture

 # Component
 1 Aluminum profile housing, height 34 mm, width 65 mm, length 100 mm, (30257.1)
 1 Frontpanel, 0.5 mm, FR4. See Gerber File below
 2 Socket, nickel-plated brass, Ø 4 mm, (30101.13)
 2 Toggle Clamp - Small Flip-down Style, from Adafruit (PRODUCT ID: 2459)

✈ Additional Tools : The Breakout Box

This is just a Connectorized Box. It shall avoid a confusing Setup. The traces on the pcb are 9 mm in width. They should be able to handle many overload conditions.

The Breakout Box

 # Component
 1 Aluminum profile housing, height 34 mm, width 65 mm, length 100 mm, (30257.1)
 1 Frontpanel, 0.5 mm, FR4. See Gerber File below
 10 Socket, nickel-plated brass, Ø 4 mm, (30101.13)

✈ Share your thoughts

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t1 = 6586 d

t2 = 210 ms

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