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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)

Specifications

• 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

Resources

Interfacing with a relay

HX711 is an electronic scale module, whose working principle is to convert the measured changes in resistance value changes, through the conversion circuit into electrical output.


Features

• Size: 33mm x20mm / 1.29 " x0.78 "
• Range:1kg
• Operating temperature:-20℃~ >85℃
• Ambient Humidity:10%-80RH
• Voltage range: 2.6~5.5V
• Weight: 32g

What's in the box?

1 x Weighing Sensor
1 x HX711 Module

Resources

Building a Raspberry Pi weight scale
Python Library
Building an Arduino weight scale

• Rated voltage: 300V
• Rated current: 16A
• Contact resistance: 20mΩ
• Insulation resistance: 5000MΩ/1000V
• Withstanding voltage: AC1500V/1Min

• Temp. Range: -30℃~ 120℃
• Max Soldering: 250℃ for 5 Sec
• Torque: 0.5Nm

• Screws: M2.5 steel Zinc plated
• Contact: phosphor bronze Ni plated or stainless steel
• Pin header: Brass, Tin plated
• Housing: PBT, UL94V-0
• Pitch: 5.08mm
• Poles: 3P
• Colour: Blue

• Motor Diameter: 4mm
• Motor Length: 8mm
• Eccentric Wheel Size: 4.4x4.4mm
• Voltage: DC1.5-3V
• Current: 0.15-0.23A

• Stable and reliable performance.
• Easy disassembly type.
• Easy to clean and maintain.
• Excellent quality and long service life.
• Has been widely applied in RC car, RC aircraft.

Laser Safety Glasses 200-450nm Eye Protection Green Lens. Not suitable for high power laser, only suitable for low power laser. Laser light is harmful to human eyes, please choose these goggles to protect your eyes!

• Brand: Eleksmaker
• Material: Plastic
• Item: Laser Protective Glasses
• Applicable Model: 200-450nm Wavelength
• Optical Density (OD): OD4
• Blue Laser Visible Light Transmission: <50%
• Red Laser Visible Light Transmission: >60%

• Durable and comfortable to wear.
• Fit for 200-450nm blue-violet lasers.
• Ideal for use in most laser applications.

• Single turn 5K
• Linear
• Carbon
• PCB type
• 5mm pitch pin
• Spline shaft
• 17mm diameter
• 0.2W
• Shaft length 10mm
• Shaft diameter 6mm

2x16 Character LCD is most popular display component for small controller like Arduino, but most of these LCD uses parallel interface. In most of the cases, you will need 10 pins to control it or to display message on it. 8-pin are for the data, Enable and Latch pin for signal control. Minimum, you will need 6-pin for 4-bit mode interface. Still a lot of pins being used up :(

This I2C module for LCD will help you save all those precious pins. This module will only need 2 GPIO pins (specifically I²C pins) to send message to Character LCD.

This module uses an I²C communication interface. Including the I2C pins: SCL and SDA, it only require two more pins for power, VCC and GND. It saves 4 to 8 pins on Arduino or any other controller. The pins are breakout into standard right angle header (2.54mm spacing), you can connect with female jumper wires directly.

It comes with potentiometer for LCD contrast adjustment, and configurable I2C Address through A0, A1 and A2 pads. Anyway, the default address is 0x3F or 0x27. There is also a mini jumper to activate or deactivate the backlight.

What's in the box?

1 x I2C Module for Character LCD

These connectors are made from high-temp nylon with gold-plated spring pins or sockets molded in. The shape of this generic XT60 prevents reverse polarity, and when plugged in the connection is super-solid. Perfect for applications up to 65A continuous draw.

• Solid and durable.
• Ensures high-amp connection.
• Low resistance for high current capacity.
• Superior technology suited to today's high power applications.
• Ergonomically designed and easy to grip.
• Easy to un-solder and reuse.
• Used in RC battery and motor projects
  

Specifications

• Model: XT60
• Colour: Yellow (as picture)
• Size: Approx. 23mm x 16mm
• Material: Copper PA66

As micro:bit is gaining traction in this region, powering it is a must :)

If you are new to micro:bit, it is a powerful embedded platform or microcontroller board with easy to get started features, even easier than Arduino. It can be powered by USB micro B when loading the program, or you can use 2 x AAA batteries. So here comes the battery holder for this microcontroller.

This is a 2 x AAA battery holder for micro:bit with cover and ON/OFF slide switch. Neat!

Note: Battery & micro:bit is not included.

Features

• Terminated with 2-way JST connector, match with battery input on
• micro:bit
• Holder for 2 x AAA batteries
• ON/OFF slide switch
• Comes with cover

In order to  properly seat your Bowden tube, it is key to have a clean, square end. Without this, you risk oozing, or worse, clogging in the hot end. This super-sharp tubing cutter is the perfect tool for obtaining a clean, square cut in your tubing, every time.

Features a stainless steel blade and switch button. The housing is made from tough durable plastic. Can also be used to cut filament. But do not use as a wire cutter or you will dull the blade.

 What's in the box?

1 x Tube Cutter

This is a low cost Red Laser Diode in Copper Casing. The Mean Wave Length is 650nm and the Power Rating is 5mW.

Specifications

• Output Power: 5mw 
• Wavelength: 650nm
• Working Voltage: 3~5V
• Working Temperature: +10 ~ +40 Celsius
• Laser Shape: line / point / cross
• Focusable: Yes
• Material: Metal
• Dimensions : 12mmx12mmx40mm

What's in the box?

1 x 3V 650nm 5mW Red Dot Diode Laser Heads

• Voltage input range: DC0-25V
• Voltage detection range: DC0.02445V-25V
• Voltage analog resolution: 0.00489V

• the positive terminal connected to VCC,
• the negative  connected to GND
• Output interface:
• "+" is 5V or 3.3V
• "-" then GND
• "s" Arduino connected to the AD pin

• Raspberry Pi https://kookye.com/2017/06/01/design-a-voltmeter-with-the-raspberry-pi-board-and-voltage-sensor/
• Interfacing Voltage Sensor with Arduino - Measure up to 25V using Arduino, tutorial  by Ravi in Electronics Hub
• Arduino 25V Voltage Sensor Module User Manual, by Henry's Bench
• Arduino Voltage Sensor 0-25V, by Superfish1000 in Instructables

• Chip: TCS230
• Input voltage: DC 3V-5V
• Output frequency voltage: 0 ~ 5V
• Use bright white LED lights
• Can be connected directly with Microcontroller
• Static detection of the measured object color
• Best detection distance: 10mm

• Interface : USB Type C Female to USB Type C Male
• Current : 3A
• Length : 270mm approx
• Weight : 34g approx
• Use for : Raspberry Pi 4
• With ON/OFF switch button , so that you can power on and off the Raspberry Pi conveniently.
• Colour: black

Raspberry pi 40 pin male to female flat ribbon cable specifically designed to fit directly onto the GPIO Headers pins of the Raspberry Pi on one side and a HAT on the other.

Please note: Pi400 is not included

Specifications

• 40 pin
• male to female
• GPIO Header connector
• 10cm long

What's in the box?

1 x male to female ribbon Cable

This is 20cm universal 4 Pin Buckled Cable with one end terminated with Grove JST connector, while the other end is four female header terminated wires. Color coded accordingly.

Specifications

• Suitable for connection from Grove to none Grove interface
• Grove Standard JST connector to 4 female header terminated wires
• Length 20 cm, end to end

This Plusivo Potentiometer Assortment Kit includes:

• 1Kohm -100Kohm Multiturn Trimmer
• 1Kohm -1Mohm Single Linear - High Precision Variable Resistor with Knobs.
• Aside from the trimmers, resistors, and knobs inside the box, you will find a mini screwdriver as a bonus.

Features

• The potentiometer kit contains Multiturn Trimmers, Linear-High Precision Variable Resistor with Knobs.
• Contains nuts and washers
• Free Mini Screwdriver
• 10 Type of Single Linear-High Precision Variable Resistor.
• 5 types of multiturn trimmer.

By using the 3D pen can actually help kids developing their artistic skills, spatial thinking, and can be a great creative outlet that engages their minds as they create. Besides, this 3D printing pen has a stable performance. It is more stable, safe and reassuring. Let your child fall in love with 3D printing.


Specifications

• Electrical Parameter: 12VDC 2A
• Comes with UK Plug, Universal (AC voltage and frequency) Adapter
• Can be used everywhere
• 3D printer for hand use
• Compatible with ABS and PLA filaments
• Diameter of filaments: 1.75mm
• Nozzle diameter: 0.7mm
• Heating Temperature:
  • 160ºC - 210ºC (PLA)
  • 210ºC - 235ºC (ABS)
• LCD for display filament type and temperature
• Adjustable filament feeding speed
• Ergonomic design, lightweight design, easy to operate
• Dimensions: 184mm x 31mm x 46mm

PLA plastic is a biodegradable thermoplastic, made from renewable resources like sugarcane or corn starch or soybeans. When it melts, there is no smell, so it is very comfortable to use in the home or classroom.


Specifications

• High strength, good toughness
• Density is small, when printing larger volume model lighter, save money
• Cost-effective as it can be processed in a wide range temperature
• PLA has a low shrinkage rate, even print larger models perform well
• To be applied to a variety of 3D printer, Makerbot, UP plus, Mendel, Prusa, series, etc
• Environmental friendly PLA material, no bubble exited, accurate filament diameter 
Smooth product surface and few wrinkling and good flow-ability
• Non-toxic and no smell

• Colour: 3 Colours (Random)
• Quantity: 3
• Material: PLA
• PLA: 190 - 220° C
• Diameter:1.75mm
• Length: 9 meters (3 meters each color)
• Usage: 3D Printing Pen
• Section Shape: Round

• Has better performance
• Designed for home and office network
• Backwards compatible with CAT-5e and CAT-5 environment
• RJ45 connectors at both ends of the cable
• Compatible on most devices. e.g: Computer, router, etc

• Type: CAT6 Flat Gigabit Ethernet cable
• Data speed: Up to 1 Gbps
• Transmission frequencies: Up to 250 MHz
• Colour: Skyblue
• Length: 2 meters