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The blue colour 5mm round top diffused LED is a vibrant color that you can't go wrong with. This size led is commonly used in many custom projects, car lighting, models, and nearly every other project you can think of. 

Specifications

Colour	Size	Wavelength(nm)	Voltage(V)	MCD	Lens colour
Red	5mm	620-630	1.8-2.3	800-1000	Red diffused
Yellow	5mm	580-590	1.8-2.3	800-1000	Yellow diffused
Green	5mm	520-530	2.8-3.6	800-1000	Green diffused
White	5mm	6000-6500k	2.8-3.6	14000-16000	Clear
Blue	5mm	460-470	2.8-3.6	800-1000	Blue diffused

What's in the box?

10 x Blue LEDs

Resources

• Python library
• Introduction

The cable tester can be used for RJ45 networks, RJ11 and telephone cables. It can test the cables with reliable accuracy. This is a useful tool for technicians in installation and maintenance.


Specifications

• Tests both RJ45 (max 8-pin Network) and RJ11 (max 6-pin phone)
• Powered by a single 9V cell battery(not included)
• Carrying case not included

What's in the box?

1 x RJ45 RJ11 Cable Tester

Raspberry Pi and jumper cables are not included.
Description:

A DC-to-DC converter is an electronic circuit or electromechanical device that converts a source of direct current (DC) from one voltage level to another. It is a type of electric power converter. 

Ideal for reading high 5V sensors on your SBC or Microcontrollers, or sending signals to 5V input devices

Specifications:

- Mutual conversion between 3V and 5V, It's convenient for PI connected to external 5V sensors or modules
- Supports total of 8 channels
- Range of voltage converted: 1.8V~6VDC

How to Use:

In the case of translating between 3.3V and 5V system:
VCCA connects to 3.3V power supply
VCCB 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 3.3V input, Bx will get 5V output
When Bx has 5V input, Ax will get 3.3V output
NO direction control required

What's in the box?:

 1 x Voltage Converter Module

AM2302 Humicap digital temperature and humidity module is a digital output signal containing a calibrated temperature and humidity combined sensor.

It uses dedicated digital module capture technology and temperature and humidity sensor technology to ensure that products has high reliability and excellent long-term stability. Sensor includes a capacitive humidity sensing element and a high-precision temperature measurement device, and with a high-performance 8-bit microcontroller connected. Therefore, the product has excellent quality, fast response, anti-interference ability, low cost and other advantages. Ultra-small size, low power consumption, signal transmission distance up to 20 meters. Making it the best choice for all kinds of applications and even the most demanding applications.

Applications

HVAC (Heating Ventilation Air Conditioning), dehumidifiers, testing and inspection equipment, consumer goods, automotive, automation, data loggers, home appliances, humidity regulator, medical,weather stations, and other related humidity detection control.

Specifications

• Dimensions: 40 x 23mm
  
• Weight: 4g
• Working voltage: 3 V - 5.5 V
  
• Port: digital two-way single bus
  
• Temperature range: -40 to 80 °C ± 0.5 °C
  
• Humidity: 20 to 90% RH ± 2% RH
  
• Platform: Arduino, SBC

What's in the box?

1 x Sensor Module

Resources

How to setup a DHT22 with your Raspberry Pi.The resistor is already on the PCB so you can skip the breadboard part.

• Datasheet (DHT22)
• Example Code (Arduino) (Credit to Adafruit)
  
  
  

Have you ever wanted to control the flow of a liquid using your computer or microcontroller, but didn’t know how?
Well, here’s how: The 12V solenoid controlled fluid valve. Simply connect a fluid source to the fluid input then once the 12Vdc is applied the fluid will start to exit until the 12Vdc signal is removed.

If your signal is 5V , then you can use relay 5Vdc to control the 12Vdc from your microcontroller.

Specifications

• Voltage: 12V DC
• Rated Power: 5W
• Pressure: Max 8 Bar
• Operation model: Normally closed
• Port Size: 1/2''
• Fluid temperature: 0-100
• Usage: water and low viscosity fluids
• Flow characteristics: 0.2Bar>1.5L/min 1Bar>7L/min 3Bar>12L/min 8Bar>20L/min;

What's in the box?

1 x Water Solenoid Valve

Please note:

The actual valve size in the unit is smaller than the port size as you will find with most taps.

Description:

Looking for a neat way to connect data transmission devices? This 40-way flat ribbon cable is commonly used with computers and audio and digital equipment. It provides a simple solution to mass termination. 

Features:

28 AWG
Extended temperature rating: -20oC to 85oC
Insulation: Polyvinyl chloride (PVC)
Stranded copper wire
Sold Per 2 Meter length

What's in the box?:

2m x Flat Ribbon Cable

 LM393 comparing two photosensitive resistance, when the imbalance (eg side pressure runway black) immediately control side of the motor stops rotating, the other side of the motor rotation acceleration, so that the car modification direction, return to the right direction, the whole process is a closed loop therefore rapid and sensitive control.

With the aim of simplifying the complex principle, we first have a by digital circuit to the intelligent tracking car, in the assembly process, we could not only familiar with the mechanical principle gradually can learn to: photocell, a voltage comparator, a motor drive circuit, and other related electronic knowledge.

Photosensitive resistance device:

This is light-sensitive resistance, it can detect the external light intensity, the stronger the outside light photosensitive resistance resistance is small, the outside light weaker resistance is greater when the red LED light projected on a white and black runway because reflection rate is different, the resistance value of the light-sensitive resistance will occur obvious difference for subsequent circuit control.

LM393 comparator integrated circuit:

LM393 is a dual voltage comparator integrated circuit, which consists of two independent precision voltage comparator. its role compare the two input voltage, based on the level of two input voltage change the level of output voltage. The output has two states: close to open or close to the low level, LM393 using open collector output, so it is necessary to add the pull resistance to output high level.

DC motor with gear reduction:

DC motor drive the car needs to slow down, otherwise to speed up the car, then ran too fast not control, and the deceleration torque is too small and could not run up. We specialize in custom of this type of motor is integrated with the reduction gear and greatly reducing the manufacture difficulty is very suitable for our use.

LM393 comparing two photosensitive resistance, when the imbalance (eg side pressure runway black) immediately control side of the motor stops rotating, the other side of the motor rotation acceleration, so that the car modification direction, return to the right direction, the whole process is a closed loop therefore rapid and sensitive control.

Assembly steps:

The first step: circuit part of the basic welding
The welding circuit part is relatively simple, the welding sequence according to the element height from low to high, the first 8 resistance welding, welding must use a multimeter to confirm whether the proper welding resistance, polar components such as transistors, green lights, definitely clear electrolytic capacitor polarity as reference element we are photo welding, welding capacitor short is the negative side of the insertion pin PCB screen printing shadow, green welding LED note long pin is positive, and the welding is not too long or easy bad welding, D4 D5 R13 R14 can temporarily do not weld, the integrated circuit chip can be inserted, preliminary after completion of welding check carefully prevent, be negligent.

Second step: mechanical assembly

The universal wheel screw is inserted into the PCB hole, and screwed into the universal wheel nut and a universal wheel. the battery box is stuck on the PCB by the double adhesive tape, the lead wire passes the PCB reserved Kong Han received PCB, the red line is connected with the 3 V positive power supply, and the yellow line is connected to the ground.

Mechanical part and assembly can be mounted first wheels, wheel consists of three pieces of black acrylic round tablets, assembly prior to exposing protective film, the inside of the wheel center hole grows circular hole, middle of the round plate diameter is relatively small, lateral wheel piece center hole Shiyuan, with two screw nuts fixed set good three round tablets, and black self-tapping screws fixed on the rotating shaft of the engine. Finally the silicone rubber tire sleeve on the wheel. Lead connection lead wire of the motor and the wheel assembly is the use of the glue on the PCB making position, attention wheels and the PCB edge retaining sufficient clearance, the motor leads are soldered to the PCB. Note that adequately longer lead, to avoid the motor rotation direction error is convenient for changing the lead wire of the order.

The third step: the installation of opto-electronic circuits

Photosensitive resistance and light-emitting diode (attention polarity) is the reverse installed on the PCB, and the ground distance of about 5mm, the distance between the light-sensitive resistance and light-emitting diode is also about 5mm. Finally can pass electrical test.

The fourth step: Vehicle debugging

In the battery box in 2 AA batteries, switches to dial in the "on", the car driving right reverse is traveling along the direction of the universal wheel, if hold the left side of the photosensitive resistance, the car to the right of the wheel rotation, Keep to the right of photosensitive resistance, the left side of the car wheel must turn, if car travel back can exchange connection of two motors at the same time. as one of the normal back on the other side as long as the exchange of the rear of the motor can be wiring. 

Note: We don't supply any manuals, please note this before you buy this DIY kit.

What's in the box?

1 x Electronic DIY Kit (batteries are not included)

This digital barometer has some interesting applications. By measuring the absolute pressure of the environment and converting this into altitude. you will have a reliable sensor for determining the height of your robot, plane or projectile. This sensor is capable of achieving an accuracy of 1m, with noise of only 17cm in ultra-high resolution. The device will operate at only 0.3uA meaning low current draw for battery powered applications.

Specifications

• 1.8V to 3.6V Supply Voltage
• Low power consumption - 0.5uA at 1Hz
• I2C interface
• Max I2C Speed: 3.5 MHz
• Very low noise - up to 0.02hPa (17cm)
• Fully calibrated
• Pressure Range: 300hPa to 1100hPa ( 9000m to -500m)
• Weight: 1.18g
• Size: 21mm x 18mm

What's in the box?

1 x BMP180 Digital Barometric Pressure Sensor Board Module
1 x Male to Male 4 pin header

Resources

Using the BMP180 with Raspberry Pi

LM393 Sound Detection Sensor Module for controller detects whether the sound has exceeded a threshold value. The sound is detected via a microphone and fed into an LM393 op-amp. The sound level setpoint is set via an onboard potentiometer.
Can be used for Acoustic control light; give sound and light alarm working with Photosensitive sensor

Note: The Maximum induction distance is 0.5M

• Main Chip: LM393, Electret condenser microphone
• Working Voltage: DC 4-6V
• Signal output indication
• Single channel signal output
• The output effective signal is low level
• When there is sound,output low level and the signal lights

What's in the box?

1 x LM393 Sound Detection Sensor

Resources

Find help with this sensor at https://www.instructables.com/id/Sound-Sensor-Raspberry-Pi/

• Direct Replacement for the Raspberry Pi Camera Board Cable
• 300mm Overall Length
• 1mm Pitch
• 15 Way Flat Cable
• Conductor: Tin plated copper
• Insulation: White PVC
• Supporting tape: Blue polyester
• UL rating: UL2896
• Temperature rating: 80°C
• Voltage: 30V
• Flame test: VW-1, FT1, FT2
• CSA Standard: CAN/CSA-22.2 No.210.2

What's in the box?

1 x Camera Board Replacement Cable

Electrolytic Radial Capacitor 1uF 50V. Typically used for surge suppressing / transient voltages / filtering out noise line noise. Rated for 1uF at 50v.


Specifications

• DC Voltage 50V
• Value 1uF
• Size 11mm x 5mm
• Pitch 2mm
• pack of 10

What's in the box?

1 x Electrolytic Radial Capacitor 1uF 50V


Resources:

Theory
Introduction
Types

This lovely little (14.2mm) seven segment display provides excellent segment uniformity and is highly visible up to seven meters away. It's ultra bright, and provides great readability even in bright ambient light!

It has four digits and a decimal point on each digit, designed for numeric output, so you can use it to add a clock, timer or counter into your next project.

These displays are multiplexed, common-cathode. What that means it that you can use a 74HC595 or just 8 microcontroller pins if you can spare them to control the 8 anodes (7-seg decimal) at about ~15mA each, and then connect NPN transistors or a TPIC6B595 to the cathodes to sink the 8*20mA = ~120mA maximum per digit.

This is an ultra bright RED colour.

Specifications

• 100mcd
• 14.2mm (0.56") digit height
• Color: red (630nm)
• Common cathode display
• Maximum power dissipation per segment: 66mW
• Maximum pulse peak forward current per segment (1/10th duty cycle, 0.1ms pulse width): 100mA
• Maximum forward current per segment: 20mA
• Maximum reverse voltage: 5V
• Maximum reverse current: 20µA
• Typical forward voltage: 2.1V at 20mA
• Maximum forward voltage: 2.5V at 20mA
• Operating temperature range: -30°C - 70°C
• Typical luminous intensity: 20mcd

What's in the box?

1 x Four Digit Seven Segment Display Red

Resources

• https://circuitdigest.com/microcontroller-projects/raspberry-pi-7-segment-display-tutorial
• https://raspi.tv/2015/how-to-drive-a-7-segment-display-directly-on-raspberry-pi-in-python

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

What's in the box?

1 x Liquid Float Switch

Resources




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

RC522 chip

MF RC522 is applied to the highly integrated read and write 13.56MHz contactless communication card chip, NXP launched by the company for the "table" application of a low-voltage, low-cost, small size of the non-contact card chip to read and write, smart meters and portable handheld devices developed better choice. The MF RC522 use of advanced modulation and demodulation concept completely integrated in all types of 13.56MHz passive contactless communication methods and protocols. 14443A compatible transponder signals. The digital part of to handle the ISO14443A frames and error detection. In addition, support rapid CRYPTO1 encryption algorithm, terminology validation MIFARE products. MFRC522 support MIFARE series of high-speed non-contact communication, two-way data transmission rate up to 424kbit/s. As new members of the 13.56MHz reader card series of highly integrated chip family, MF RC522 MF RC500 MF RC530 There are a lot of similarities, but also have many of the characteristics and differences. Communication between it and the host SPI mode helps to reduce the connection narrow PCB board volume, reduce costs.

RFID module

The MF522-AN module uses the the original Philips MFRC522 chip design circuit card reader, easy to use, low cost, and applies to the user equipment development, the reader and the development of advanced applications, the need for the user RF card terminal design/production. This module can be directly loaded into the various reader molds. Utilizes a voltage of 3.3V, through the SPI interface simple few lines directly with any user CPU motherboard connected communication can ensure that the module is stable and reliable work, distance card reader

Specifications

Electrical parameters

Operating current :13-26mA/DC 3.3V
Idle current :10-13mA/DC 3.3V
Sleep current: <80uA
Peak current: <30mA
Operating Frequency: 13.56MHz
Supported card types: mifare1 S50, mifare1 S70 MIFARE Ultralight, mifare Pro, MIFARE DESFire
Product physical characteristics: size: 40mm×60mm
Environmental Operating temperature: -20 to 80°C
Environmental Storage Temperature: -40 to 85°C
Relative humidity: relative humidity 5%-95%

Module interfaces SPI Parameter:

Data transfer rate: maximum 10Mbit/s

What's in the box?

1 x RFID-RC522 module
1 x Standard S50 blank card (Non-contact IC card)
1 x S50 special-shaped card (key ring shape)
1 x Straight and 1 x angled male to male header(Soldering required)

Resources

Our setup guide

Specifications

• Model Number: blank card
• Material: PV
• Colour: blank white
• Size: 85.6mm X 54mm
• Thickness: 0.8mm
• Printing: offset printing
• Chip: 1k S50
• Certification: CE,FCC
• Frequency: 13.56MHz
• Protocol standard: 14443a
• Memory: 8kbits

What's in the box?

 
1 x RFID Smart Card