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DC12V Water Level Controller Sensor Module (12V relay level sensor)
Description:

The unit is small and compact, requires only simple wiring. It boasts low power consumption and high switching capacity. And has several functional stability characteristics.

Specifications:

Type: water level sensor module
Power supply current: 20mA
Power supply voltage: DC12V
Power: 20W

Wiring

N  Neutral in
L   12V in

N  Neutral out
L2 12V out

What's in the box

1 x water level sensor module
R459.90  Inc VAT
Liquid Water level sensor Side Mounted Float Switch (liquid level side mounted)

Description:

The liquid level switch detects the rising level of liquid in a sump or tank. It can be connected to a micro controller. It can then be used to start/stop a pump which then pumps liquid in/out until the level of the liquid has been restored to the point where the pump is switched off again. The switch may be used in a pump station, a sensor, a tank alarm, or other devices.

 

Specification:

Contact Rating: 10W
Switching Voltage: 220V
Switching Current: 0.5A
Breakdown Voltage: 220VDC
Carry Current: 1.0A
Contact Resistance: 100mohm

What's in the box:

1 x Liquid Water level sensor 

Resources:

Python library
Introduction to Buttons and Switches
Types of buttons and switches

 

R39.90  Inc VAT
PP Liquid Water Level Sensor Vertical Float Switch Down White (straight float level)
Description :

A compact vertically mounted float switch which can be mounted at either the top or bottom of a tank (by the supplied 'O' ring and nut) to either rise or fall for activation (internal magnet) of a sealed reed relay.
The sensor is supplied pre-wired with flying output leads.
Float switch is a used to sense the level of liquid within a tank, used to activate a pump, an indicator, an alarm or other device.

Use them with hydroponics, saltwater tanks, freshwater tanks, gardening, aquariums for power head control, pet bowls, fish tanks, filtration, heating, or what ever your project may be
Contains no mercury
Down float switch

Specifications :

  • Maximum Load: 50 W
  • Max Switching Voltage: 100V DC
  • Minimum Voltage: 250V DC
  • Maximum Switching Current: 0.5 A
  • Max Load Current: 1.0 A
  • Max Contact Resistance: 0.4 Ω
  • Temp Rating: -20~ 80℃
  • Net Weight: 12g
  • Material: PP




Package includes :

1 x Liquid Float Switch


Resources:

Python library
Introduction to Buttons and Switches
Types of buttons and switches
R29.90  Inc VAT
SparkFun Logic Level Converter Bi-Directional (Sparkfun logic level converter )
Description:

If you’ve ever tried to connect a 3.3V device to a 5V system, you know what a challenge it can be. The SparkFun bi-directional logic level converter is a small device that safely steps down 5V signals to 3.3V AND steps up 3.3V to 5V at the same time.

This level converter also works with 2.8V and 1.8V devices. What really separates this Logic level converter from our previous versions is that you can successfully set your high and low voltages and step up and down between them safely on the same channel. Each level converter has the capability of converting 4 pins on the high side to 4 pins on the low side with two inputs and two outputs provided for each side.

The level converter is very easy to use. The board needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using. High voltage (5V for example) to the ‘HV’ pin, low voltage (3.3V for example) to ‘LV’, and ground from the system to the ‘GND’ pin.

Dimensions: 0.63 x 0.52" (16.05 x 13.33mm)

Documents:

R59.90  Inc VAT
Tank Float Switch Water Level Controller Sensor (Tank Float switch)
Description:

A float switch detects the level of a liquid in a tank or container. It floats on top of the liquid surface and acts as a mechanical switch as the liquid level goes up or down. They control devices like pumps (pump water in or out), valves (open or close inlet/outlets), or alarms to notify users.



Specifications:

Shape: Square
Contacts: NO NC
Rated voltage: 250V(380V)
Rated current: 8A(4A)
Working temperature: 0℃<=water temperature<=65℃
Mechanical endurance: ≥100,000times
Electrical endurance:≥50,000times
Cable length: 1.9m / 74"
Environment: pool, water tank/dam
Control level difference > 40cm

Features:

Easy to use, easy to install,
Safe, reliable, maintenance-free, non-toxic and environmentally friendly.

Package includes:

1 x Float Switch Liquid Level Controller Sensor
R499.90  Inc VAT
WS Logic Level Converter green 8 channel (WS logic level convert green)
Features
  • 8 channels bidirectional voltage translation between different logic level, translate between Ax and Bx automatically
  • 4 pairs of power supply interfaces, supports more situations
  • Use tantalum capacitors for power filter, provides more stability
  • Voltage level: 1.8V-6V
  • Dimension: 31.6mm x 25.4mm
How to Use

In the case of translating between 3.3V and 5V system:

  • VCCA/VA connects to 3.3V power supply
  • VCCB/VB connects to 5V power supply
  • GND connects to power negative pole respectively, the two power supply should be common-grounded with each other
  • When Ax has TTL 3.3V input, Bx will get TTL 5V output
  • When Bx has TTL 5V input, Ax will get TTL 3.3V output
  • NO direction control required
Development Resources

Wiki : www.waveshare.com/wiki/Logic_Level_Converter

8 channels bidirectional voltage translation between different logic level, translate between Ax and Bx automatically.
R39.90  Inc VAT
5V 1 Channel Level Trigger Optocoupler Relay Module (single relay red board)
Description:

The module uses a quality relay with a normally open interface
Using SMD optocoupler isolation, driving ability, stable performance
The module can be set high or low with a jumper setting trigger
Fault-tolerant design, even if the control line is broken, the relay will not operate
A power indicator (green) and a relay status indicator (red)

Specification:

- Maximum load: AC 250V/10A, DC 30V/10A
- Trigger current: 5mA
- Working voltage: 5V
- Module size: 50mm x 26mm x 18.5mm (L x W x H)
Four mounting bolt holes, diameter 3.1mm

Module interface:

DC : positive power supply (VCC)
DC-: negative power supply (GND)
IN: can be high or low level to control the relay

Relay outputs:

NO: normally open
COM: Common Interface
NC: normally closed

High and low level trigger options:

It is low level trigger when jumper connects to LOW pin
It is high level trigger when jumper connects to HIGH pin

What's in the box:

1 x 1 Channel H/L level trigger optocoupler relay module

Interfacing with a relay
R29.90  Inc VAT
Cambridge University Press - Coding Club Python Next Steps Level 2 (Python Next Steps Level 2)
Description:

Books at this level are intended for young coders that have enjoyed level 1 books and want to continue their coding adventure at a slightly higher level.

Python Next Steps continues the Python journey. Readers learn more about this fantastic programming language while building several useful, short applications including their own calculator. Several spare buttons will be built so that young coders can attach their own functions making this a truly programmable calculator!

Chapter 1

Ch.1 - Data types:
In this Chapter you are going to:

   >>> Learn about data types.
   >>> Learn about tuples, lists and dictionaries.
   >>> Make a version of MyMagic8Ball that is much shorter to code than the one from Python Basics.

PythonNextSteps-Ch1.pdf

Chapter 2

Ch.2 - Building GUIs:
In this Chapter you are going to:

   >>> Practise using tuples and dictionaries.
   >>> Review using tkinter and learn about some more widgets.
   >>> Build a GUI.
   >>> Build a glossary application that can easily be customised into a number of other simple cool apps too.

Chapter 3

Ch.3 - Designing a Simple Calculator:
In this Chapter you are going to:

   >>> Learn about 'for loops'.
   >>> Use lists and loops to save a lot of repetitive coding.
   >>> Learn more about the tkinter button widget.
   >>> Design your own calculator application called MyCalculator.
   >>> Build a complex GUI easily.

Chapter 4

Ch.4 - A Fully Working Calculator:
In this Chapter you are going to:

   >>> Learn how to use default values in functions creatively.
   >>> Learn about debugging.
   >>> Learn about catching and handling errors.
   >>> Delve deeper into binary numbers.
   >>> Produce a fully working calculator.

Chapter 5

Ch.5 - Customising the Calculator:
In this Chapter you are going to:

   >>> Layout a customisable calculator.
   >>> Create some fully functioning constant buttons.
   >>> Start a module to hold the functions for our programmable buttons.
   >>> Learn a little more about how to organise code in applications.

Bonus Chapter

Bonus Chapter - Algorithms:
In this Chapter you are going to:



   >>> Add code to the programmable buttons.
   >>> Learn about algorithms.
   >>> Learn about factorials.
   >>> Learn how to convert numbers to roman numerals.
   >>> Make a fully programmable calculator with some unique functions including its own customisable game.

R219.90  Inc VAT
Cambridge University Press - Coding Club Python Building Big Apps Level 3 (Python Big Apps Level 3)
Description:

Answers and full source code are on the resources page.

Books at level 3 are intended for young coders that are starting to want to build more involved applications. The first book at this level is Python: Building Big Apps. It introduces Object Oriented Programming (OOP) so that readers become familiar with classes and objects which are extensively used in game programming.

The book does not set out to teach perfect OOP but instead simply aims to introduce some of the concepts and to recommend that building classes allows students to organise their code in big projects in a logical and manageable way.

While learning more theory, readers will build a number of small projects ending with a big project - MyPong. The final chapter will show how building MyPong carefully allows us to quickly and easily build a BreakOut style game, an Invaders game and many more.



Chapter 1

Ch.1 - Can you guess my password?
In this Chapter you are going to revise:

   >>> variables
   >>> if, elif and else
   >>> functions
   >>> while loops
   >>> modules.

Chapter 2

Ch.2 - Objects, classes and factories
In this Chapter you are going to:

   >>> learn how to design classes
   >>> learn how to make objects from classes
   >>> start to build your own module
   >>> learn how to build larger programs one bit at a time.


PythonBuildingBigApps-Ch2.pdf


The MyPong Project:

Chapter 3

Ch.3 - Creating the Table
In this Chapter you are going to:

   >>> design a table class
   >>> learn a bit more about the tkinter module
   >>> build a simple graphical app.

Chapter 4

Ch.4 - Making the Ball
In this Chapter you are going to:

   >>> design a ball class
   >>> learn how to add the ball to the table
   >>> learn how to animate shapes in tkinter.

Chapter 5

Ch.5 - Building the Bats
In this Chapter you are going to:

   >>> design a bat class
   >>> learn how to add the bats to the table
   >>> learn how objects communicate with each other.

Chapter 6

Ch.6 - The Rules and Scoring
In this Chapter you are going to:

   >>> stop the ball bouncing off the left and right walls
   >>> add a scoring system to your game
   >>> finish MyPong.



Two new Games:Bonus Chapter

Bonus Chapter - Two more games
In this Chapter you are going to:

   >>> see how useful lists are for storing objects in games
   >>> see how to add many bricks at once using a loop
   >>> see how flexible your ball, bat and table classes are
   >>> produce two new games that can be further customised.

R219.90  Inc VAT
12V Lead Acid Battery Digital Charge Level Indicator (battery meter digital)
Description:

Charge Level Red Indicator Voltmeter Precise for 12V Lead-acid Battery

Specifications:

1. Working current:5-15mA
2. Eight electricity Level Resolution:10% 25% 40% 50% 60% 75% 90% 100%
3. Voltmeter accuracy:1%
4. Working temperature: -10 ~ 65 Celsius
5. Operating Humidity: 10 ~ 80%
6. Dimensions: 48mm x 29mm x 22mm

Indicator:

Battery voltage is greater than 11.1V, 1 led indicator is lit.
Battery voltage is greater than 11.3V, 2 led indicator is lit.
Battery voltage is greater than 11.6V, 3 led indicator is lit.
Battery voltage is greater than 11.9V, 4 led indicator is lit.
Battery voltage is greater than 12.2V, 5 led indicator is lit.
Battery voltage is greater than 12.5V, 6 led indicator is lit.
Battery voltage is greater than 12.9V, 7 led indicator is lit.
Battery voltage is greater than 13.3V, 8 led indicator is lit.

Package Includes:

1 x lead acid LED indicator battery capacity tester voltmeter 12V
R93.90  Inc VAT
Low Level 5V 1 Channel Solid State Relay Module SSR G3MB-202P 240V 2A Output with Resistive Fuse (5V SSR single)
Description:

Omron 5V solid state relay 240V 2A, the output with a resistive fuse 240V 2A.
Input power: 5V DC (160MA)
input control signal voltage:
Low level module: (0-2.5V state low level relay OFF)
(3.3-5V state high level relay ON)

What's in the box?

1 x solid state relay

size: (L * W * H mm) 
    1 channel: 25 * 34 * 25
    2 channel: 55 * 33 * 25
    4 channel: 57 * 55 * 25
    8 channel: 106 * 56 * 25

Input section:
DC +: Connect the power supply positive (according to the relay voltage)
DC-: Connect the power supply negative
CH1: 1 relay module signal trigger terminal (low level trigger active)
CH2: 2 relay module signal trigger terminal (low level trigger active)
CH3: 2 relay module signal trigger terminal (low level trigger active)
CH4: 2 relay module signal trigger terminal (low level trigger active)

High and low meaning:

High-level trigger refers to the signal trigger side (IN) and the negative power supply has a positive voltage between the positive and the power supply is usually connected to the trigger side of a trigger, when the trigger side voltage or trigger to reach the trigger Voltage, the relay is pull.

Low-level trigger refers to the voltage between the signal trigger terminal and the negative terminal of the power supply is OV, or the voltage of the trigger terminal is lower than the voltage of the positive terminal of the power supply. When the voltage is low enough to trigger, the relay is pulled in, The negative side of the power supply is connected to the trigger side of a trigger, so that the relay is pull.

Electrical parameters:

Voltage Version Quiescent Current Operating Current Trigger Voltage Trigger Current
 1 channel 5V 0mA 12.5mA 0-2.5V 2mA
 2 channel 5V 0mA 22.5mA 0-2.5V 2mA
 4 channel 5V 0mA 48mA 0-2.5V 2mA
 8 channel 5V 0mA 102mA 0-2.5V 2mA


Instructions

1. Module power supply: the power must be DC, the voltage and the relay voltage to match
2. Wiring method:
When the trigger side of the signal trigger level, the relay will be connected, the device has electricity and work

Notes
 
1. Module power supply: power must be DC, 5V power supply
2. Module control terminal voltage: This module can only be used to control AC current, can not control DC current.


R39.90  Inc VAT
Low Level 5V 4 Channel Solid State Relay Module SSR G3MB-202P 240V 2A Output with Resistive Fuse (5V SSR quad)
Description:

Omron 5V solid state relay 240V 2A, the output with a resistive fuse 240V 2A.
Input power: 5V DC (160MA)
input control signal voltage:
Low level module: (0-2.5V state low level relay OFF)
(3.3-5V state high level relay ON)

What's in the box?

1 x solid state relay

size: (L * W * H mm) 
    1 channel: 25 * 34 * 25
    2 channel: 55 * 33 * 25
    4 channel: 57 * 55 * 25
    8 channel: 106 * 56 * 25

Input section:
DC +: Connect the power supply positive (according to the relay voltage)
DC-: Connect the power supply negative
CH1: 1 relay module signal trigger terminal (low level trigger active)
CH2: 2 relay module signal trigger terminal (low level trigger active)
CH3: 2 relay module signal trigger terminal (low level trigger active)
CH4: 2 relay module signal trigger terminal (low level trigger active)

High and low meaning:

High-level trigger refers to the signal trigger side (IN) and the negative power supply has a positive voltage between the positive and the power supply is usually connected to the trigger side of a trigger, when the trigger side voltage or trigger to reach the trigger Voltage, the relay is pull.

Low-level trigger refers to the voltage between the signal trigger terminal and the negative terminal of the power supply is OV, or the voltage of the trigger terminal is lower than the voltage of the positive terminal of the power supply. When the voltage is low enough to trigger, the relay is pulled in, The negative side of the power supply is connected to the trigger side of a trigger, so that the relay is pull.

Electrical parameters:

Voltage Version Quiescent Current Operating Current Trigger Voltage Trigger Current
 1 channel 5V 0mA 12.5mA 0-2.5V 2mA
 2 channel 5V 0mA 22.5mA 0-2.5V 2mA
 4 channel 5V 0mA 48mA 0-2.5V 2mA
 8 channel 5V 0mA 102mA 0-2.5V 2mA


Instructions

1. Module power supply: the power must be DC, the voltage and the relay voltage to match
2. Wiring method:
When the trigger side of the signal trigger level, the relay will be connected, the device has electricity and work

Notes
 
1. Module power supply: power must be DC, 5V power supply
2. Module control terminal voltage: This module can only be used to control AC current, can not control DC current.



R126.90  Inc VAT
Cambridge University Press - Coding Club Python Basics Level 1 (Python Basics Level 1)
Description:

The programming language Python 3 is used to introduce the principles of programming. In this book you learn how to write simple programs that include My8Ball, a number guessing game and a small graphical application called MyEtchASketch.

More importantly, by the end of the book, you should be able to write your own short programs and be able to fully customise both the look and how the various programs you have made to your own liking.

Chapter 1

Ch.1 - Python, IDLE & Your First Program:
In this Chapter you are going to:

   >>> Meet the programming language you are going to learn about.
   >>> Meet IDLE which will help organise and run your code easily.
   >>> Check that your computer is set up correctly.
   >>> Write and run your first program.

Chapter1.pdf

Chapter 2

Ch.2 - Some text, some maths & going loopy:
In this Chapter you will be able to:

   >>> Learn how to do some more with texts.
   >>> Get Python to do some maths for you.
   >>> Learn about how loops work.
   >>> Learn lots of useful operators.

Chapter 3

Ch.3 - Readable code and My8Ball Game:
In this Chapter you will be able to:

   >>> Write and save a Python file using Script Mode.
   >>> Learn how to write clear readable code.
   >>> Run a Python file.
   >>> Learn about how to get user input.
   >>> Learn about if and else clauses.
   >>> Write a short game called MyMagic8Ball.


Here is a movie of this chapter's project: my8ball.py

Chapter 4

Ch.4 - Functions:
In this Chapter you will be able to:

   >>> Learn about functions .
   >>> Write your own functions.
   >>> Create a number guessing game.



Here is a movie of this chapter's project: myNumber.py

Chapter 5

Ch.5 - MyEtchASketch:
In this Chapter you will be able to:

   >>> Learn how to use the tkinter library.
   >>> Make your own Etch A Sketch game.
   >>> Learn how to put an application in its own window.
   >>> Learn how to attach functions to keyboard presses.



Here is a movie of this chapter's project: myEtchaSketch.py
Here is a movie of a two player version: ourEtchaSketch.py

Answers to Challenges

Click below to find the answers to the puzzles and challenges in Python Basics.

Answers

R219.90  Inc VAT
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