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Tactile Switches or tact switches are an on/off electronic switch that is only on when there is some pressure put on it or when the button is pressed. As soon as the tactile switch button is released and the pressure has been took off, the circuit is then broken.
- Size: (Approx.)6x6x5mm
- Life: 100000 times
- Quantity: 5pcs
- Current: 50mA
- Voltage: 12V
What's in the box?
5 x Tactile Switches
Resources
Python library
Introduction to Buttons and Switches
Types of buttons and switches
Raspberry Pi and jumper cables are not included.
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
What's in the box?
1 x Voltage Converter Module
Resources
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
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)
Please note: Pic is for illustration purposes only
The 1N4007 is used as a general-purpose diode. It is normally constructed to be used as a rectifier in the power supply section of electronic devices to convert AC voltage to DC voltage with other filter capacitors.
Specifications
- 1N4007 Diode
- rectifying
- standard 1A 1000V
- DO-41
What's in the box?
5 x diodes
Resources
Intoduction
Basics, Types, Characteristics, Applications & Packages
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)
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/
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.
Specifications
- 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
A voltage regulator generates a fixed output voltage of a preset magnitude that remains constant regardless of changes to its input voltage or load conditions.
Specifications
- Integrated circuit
- Voltage regulator
- 5V
- Non insulated
What's in the box?
1 x TO-220 Voltage Regulator IC
You might also need a heatsink for your regulator
Resources
Understanding How a Voltage Regulator Works
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
Arduino Mega is an ATmega2560 core microcontroller development board. Itself has 54 digital input/output terminals (14 PWM outputs), 16 simulation inputs, 4 UARTs (hardware serial ports), using the 16 MHz crystal oscillator. With the bootloader, download the program directly via USB without having to go through other external writers. Supply part of the optional USB power, or external power using a AC-to-DC adapter and battery.
Rapid growth due to open original code, as well as the concept of using Java (cross-platform) C language development environment for Arduino module. The Arduino can easily use the Arduino language with Flash or Processing ... software communication, to make multimedia interactive works. Arduino development IDE interface is based on open-source principles, allows you to download for use in projects.
Power supply design
There are two options for the power supply system of the Arduino Mega. USB direct power supply or external power supply. The power supply will be switched automatically. External supply AC-to-DC adapter or the battery can be selected on this control panel. Limit the voltage range of 6V ~~ 12V, but if the voltage supplied is less than 6V, I / O port may not be supplied to a voltage of 5V, and therefore not stable; If the voltage is greater than 12V, the regulator device may possibly overheat and damage the Arduino MEGA. It is therefore recommended that for the operating supply of 6.5 ~ 12V, the recommended power supply is 7.5V or 9V.
The development board have been rigorously tested at the factory.
Specifications
- Microcontroller: ATmega2560
- Operating voltage: 5V
- Input voltage (recommended): 7-12V
- Digital I/O pins: 54 (of which 14 provide PWM output)
- Analog input pins: 16
- DC current per I/O pin: 40 mA
- DC current for 3.3V Pin: 50 mA
- Flash Memory: 256 KB of which 4 KB is used by the bootloader
- SRAM: 8 KB
- EEPROM: 4 KB
- Clock Speed: 16MHz
What's in the box?
1 x Control board
1 x USB cable
Resources
Getting started with Arduino products
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
- This product is mainly used for water metering
- High amplitude ≥ 4.6V
- Low amplitude ≤ 0.5V
- Electric strength 1250V/min
- Insulation resistance ≥ 100MΩ
- Hydrostatic pressure testing ≤ 2.0Mpa
Specifications
- The lowest rated working voltage: DC4.5 5V-24V
- Maximum operating current: 15 mA (DC 5V)
- Working voltage range: DC 5~18 v
- Load capacity: ≤ 10 mA (DC 5V)
- Use temperature: ≤ 80°C
- Operating humidity range: 35%~90%RH (no frost)
- Allowing pressure: pressure 2.0Mpa
- Temperature: -25~ 80 °C
- External threads: 1/2"
- Outer diameter: 20mm
- Intake diameter: 9mm
- Outlet diameter: 12mm
Application
Water heaters, water vending machines, flow measurement
What's in the box?
1 x Water flow sensor
Resources
Flow sensor Wiki
An instructable on how to use the Flow Sensor with Arduino
Adafruit experiment connecting the Flow Sensor to a Raspberry Pi
https://www.ardumotive.com/water-flow-sensor-en.html
RPi: https://www.youtube.com/watch?v=8JXd-2_zJQ0
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
Setup guide
- 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
RFID is an acronym for “radio-frequency identification” and refers to a technology whereby digital data encoded in RFID tags or smart labels
Features
- Small and durable
- Waterproof, shockproof, anti-corrosive.
- Keyring for easy carrying.
- Not re-programmable
Specifications
- Main Chip : Fudan F08 compatible S50
- Colour : Blue,Yellow, Black, Green, Red
- Size : Approx. 40.5×32×4.2mm
- Operating Frequency : 13.56 MHz
- Communication speed : 106K Boud
- Read distance : 2.5 ~ 10cm
- Read time : 1 ~ 2ms
- Operating Temperature : -20 ℃ ~ 85 ℃
- Endurance :> 100,000 times
- Storage capacity : 8Kbit, 16 partitions, each partition with 2 group passwords
Typical applications
Enterprise / campus access cards, parking, district management,attendance systems, patrol systems, enterprise systems, access control systems, radio frequency identification field etc.
What's in the box?
1 x 13.56MHz RFID Keyfob
- Joystick Size: Approx. 95x60x100mm
- Encoder Board Size: Approx. 85x35mm
- USB Cable Length: Approx. 1.8m
- Colour: Red
We have tested this unit on Raspberry Pi using Retropie and a Windows 7 PC using MAME.
What's in the box?
1 x Encoder Board
1 x USB Cable
1 x 5 pin Cable for Joystick
1 x 5 Pin Joystick
8 x 30mm Push Buttons
2 x 24mm Push Buttons
10 x Cables for Buttons
Resources
Get Retropie on the Raspberry Pi
ModMyPi setup guide
Please note: Pic is for illustration purposes only
The 1N400x (or 1N4001 or 1N4000) series is a family of popular one-ampere general-purpose silicon rectifier diodes commonly used in AC adapters for common household appliances. Its blocking voltage varies from 50 volts (1N4001) to 1000 volts (1N4007).
Specifications
- Average forward current is 1A.
- Non-repetitive peak current is 30A.
- Reverse current is 5uA.
- RMS reverse voltage is 35V.
- Peak repetitive Reverse voltage is 50V.
- DO-41 Package.
What's in the box?
10 x diodes
Resources
Intoduction
Basics, Types, Characteristics, Applications & Packages
These boards are especially useful for preserving a prototype or experiment you just created on a solderless breadboard by soldering all the pieces in place.
- Grid : 0.1" (2.54mm)
- Thickness : 1.6mm(5pcs)
- Hole diameter : about 1mm
- Material : FR-4 (glass fiber)
- All holes are plated through
- Both sides are identical
Resources
Introduction to soldering
Video: How to solder properly
The secrets to good soldering
This Peltier works very well as long as you remove the heat from the hot side. After turning on the device, the hot side will heat quickly, the cold side will cool quickly. If you do not remove the heat from the hot side (with a heat sink or other device), the Peltier will quickly reach stasis and do nothing. We recommend using an old computer CPU heatsink or other block of metal to pull heat from the hot side. We were able to use a computer power supply and CPU heatsink to make the cold side so uncomfortably cold we could not hold our finger to it.
Note: It is imperative that a heat sink is used on the hot side of the module. Running the module without one can cause damage to this part. If it’s too hot to comfortably touch, you’re in the danger zone!
Specifications
- Model: TEC1-12715
- Colour: white
- Couples: 127
- Voltage: 12V
- Umax: 15.4V
- Imax: 15A
- Max power consumption: 231W
- Tmax: 70°C
- Qcmax △T=0(W): 137W
- Size: 40 x 40 x 3.3mm
- Weight: 50g
What's in the box?
1 x cooler plate module(40mm x 40mm)
Resources
- Learn about TECs (Tom’s Wiki)
- Learn about thermoelectric effect (Wikipedia)