Kereskedelmi, irodai és ipari

Features:
XTW6009 is a high-performance 400KHz 4A switch currency step-up (BOOST) module. This module XL6009 is coming with the 3rd generation high-frequency switch technology as the core chip, The performance is much higher than LM2577.
Wide input voltage: 3V~32V; Optimum operating voltage range: 5~32V; Wide output voltage: 5V~40V.
With 4A high efficiency MOSFET switches, so the efficiency can be up to 94% , (LM2577current is 3A only).
With ultra high switch frequency 400KHz , even if small capacity filtering capacitors can achieve very good results, ripple is smaller (Compare to LM2577 frequency 50KHz).
Specification:
      Model: DSN6009 boost module
Module Properties: Non-isolated boost (BOOST)
Rectification: Non-Synchronous Rectification
Input Range: 3V ~ 32V
Output Range: 5V ~ 35V
Input Current: 4A (max), no-load 18mA (5V input, 8V output, no-load is less than 18mA. Higher the voltage, the greater the load current.)
Conversion efficiency: <94% (greater the pressure, the lower the efficiency)
Switching frequency: 400KHz
Output Ripple: 50mV (the higher the voltage, the greater the current, the greater the ripple)
Load Regulation: /-0.5%
Voltage Regulation: /-0.5%
Operating Temperature: -40 degree to 85 degree
Body Size: 43 x 20 x 12mm/1.7" x 0.8" x 0.47"(L*W*T)
Input way: IN , IN-;
Output way: OUT , OUT-

200W pixel OV2640 camera module STM32F4 driver source code Support JPEG output The standard camera lens has a focal length of 3.6mm, and other high-end megapixel lenses are optional.
1. Module Introduction
The 200W pixel OV2640 camera module is made of 1/4-inch OV2640 mega-HD CMOS sensor. It has the characteristics of high sensitivity, high flexibility, and support for JPEG output. And can support exposure, white balance, chroma, saturation, contrast and many other parameter settings, support JPEG/RGB565 format output, can meet the needs of different occasions.
Module parameter performance:
1. Sensor size: 1/4 inch.
2. Pixel: 1600*1200 (200W).
3. Output format: RGB565/JPEG/YUV/YCbCr etc.
4. Control interface: SCCB.
5. Working voltage: 3.3V
6. Module size: 27mmX27mm
The OV2640 image sensor has 2 million pixels (1632x1232 pixels), its small size, low operating voltage, and provides all the functions of a single-chip UXGA camera and image processor. Controlled by the SCCB bus, it can output 10-bit sampling data with various resolutions such as whole frame, sub-sampling, and windowing. Users have complete control over image quality, data format and transmission method. All image processing functions including gamma curve, white balance, saturation, chroma, etc. can be programmed through the SCCB interface. OmmiVision image sensors apply unique sensor technology to improve image quality by reducing or eliminating optical or electronic defects such as fixed pattern noise, stubble, floating, etc., resulting in clear and stable color images.
This product uses OV2640 sensor as the core component, integrates active crystal oscillator and LDO, and has a simple interface and is very convenient to use.
Module Features:
● High sensitivity, low voltage suitable for embedded applications
● Standard SCCB interface, compatible with I2C interface
●RawRGB, RGB(GRB4:2:2, RGB565/555/444), YUV(4:2:2) and YCbCr(4:2:2) output formats
● Support UXGA, SXGA, VGA, QVGA, QQVGA, CIF, QCIF and various sizes up to 40x30 size
● Support automatic exposure control, automatic gain control, automatic white balance, automatic elimination of light stripes, automatic black level calibration. Image quality control includes color saturation, color
Phase, Gamma, Sharpness ANTI_BLOOM and other settings.
● Support image zoom, pan and window settings
● Support image compression, you can output JPEG image data
● Built-in embedded microprocessor
● Integrated active crystal oscillator 12M, no need to provide external clock
● Integrated LDO, only need to supply 3.3V to work normally

This section supporting dual terminal expansion board (excluding UNO R3)
    The terminal expansion board can magically expand the terminal controller. And the user can also overlay on top of other expansion boards. Let your project to get rid of the shackles of the bread board wiring, the line structures become easier and more reliable.
As shown above, the expansion of the terminal, while also retaining the original expansion board socket.
Shipping list:
1.Screw Shield V2 terminal expansion board one pair
 

Function: gather all the way ADC 16 analog signals.
Use CD74HC4067 16-channel analog switch
Analog input: C0-C15 16-channel
Analog output: DIG
Channel Control: S0-S3
Description: This is a breakout board for the very handy 16-Channel Analog / Digital Multiplexer / Demultiplexer CD74HC4067 This chip is like a rotary switch - it internally routes the common pin (COM in the schematic, SIG on the board) to one of. 16 channel pins (CHANxx). It works with both digital and analog signals (the voltage can not be higher than VCC), and the connections function in either direction. To control it, connect 4 digital outputs to the chip's address select pins ( S0-S3), and send it the binary address of the channel you want (see the datasheet for details). This allows you to connect up to 16 sensors to your system using only 5 pins!
Since the mux / demux also works with digital signals, you can use it to pipe TTL-level serial data to or from multiple devices. For example, you could use it to connect the TX pins of 16 devices to one RX pin on your microcontroller . You can then select any one of those 16 devices to listen to. If you want two-way communications, you can add a second board to route your microcontroller's TX line to 16 device's RX lines. By using multiple boards, you can create similar arrangements for I2C, SPI, etc.
The internal switches are bidirectional, support voltages between ground and VCC, have low "on" resistance and low "off" leakage, and to prevent crosstalk, perform "break-before-make" switching. The board also breaks out the chip's "enable "pin, which when driven high, will completely disconnect the common pin (all switches" off ").
Features:
2V to 6V operation
"On" resistance: 70 Ohms @ 4.5V
6ns break-before-make @ 4.5V
Wide operating temperature range: -55℃ to 125℃

LilyPad Light Sensor module -TEMT6000

Description:
The TDA1308 is an integrated class AB stereo headphone
driver contained in an SO8 or a DIP8 plastic package. The
device is fabricated in a 1 mm CMOS process and has
been primarily developed for portable digital audio
Features:
1.Wide temperature range
2.No switch ON/OFF clicks
3.Excellent power supply ripple rejection
4.Low power consumption
5.Short-circuit resistant
6.High performance
7.high signal-to-noise ratio
8.high slew rate,low distortion
9.Large output voltage swing.
Specifications:
1. Working voltage:3V-6V
2. Size:20*20mm
Package included:
1x DA1308 Headphone Amplifier Board

Working voltage:DC3.7V-15V
Ultra-small volume dynamic microphone preamplifier board,two-channel design,suitable for a single lithium battery-powered,using AD828 fever op amp chip,suitable for low voltage power supply (3.7-15V)
Note:This microphone amplifier board without power regulator circuit,can only use the battery or linear power supply,can not use switching power supply,otherwise there will be interference
If you only used one channel,the other channel needs to short-circuit the input with GND,To avoid interference with the signal crosstalk
Size:3.2x2cm/1.3x0.79inch
Note:
Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid
Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!
Packing List:
1x AD828 Stereo Dynamic Microphone Preamplifier Board

Without nut，Without nut，Without nut

Desktop ATX Power Adapter Board Computer ATX Power Supply Board Power Supply Lead Wiring Module

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GY-302 BH1750 Chip Light Intensity Light Module
Description:
Type: GY - 302
Size: 13.9 mm X 18.5 mm
The original BH1750FVI ROHM chip
Power supply: 3-5 v
Data range: 0-65535
Sensor built-in and bitad converter
Direct digital output, bypassing the complicated calculation, omit calibration
Do not distinguish between ambient light
Close to the visual sensitivity of spectral characteristics
For a wide range of brightness for 1 lux high precision measurement
 
 
Package included:
GY-302 BH1750 Light Intensity Light Module

Songle Relay

New Product Introduction:
 
1: The new United States imported chips, definitely not homemade chips, disassemble chip.
 
2: The maximum output current 3A, long-running 2.1A, sufficient margin.
 
3: The new design, circuit design does not require electrolytic capacitors and tantalum capacitors (electrolytic capacitor life is short, tantalum risk of explosion). Now with the use of high-end large-size solid ceramic capacitor circuit (MCC) 2 Ke.
 
4: The new program uses synchronous rectification circuit conversion efficiency is very high, in turn 5V 0.7A 6.5V when efficiency up to 97.5% , 12V turn 5V 1A, they also reached 94% , unlike some peers efficiency is only 60-70% . (Efficiency test removed the input reverse polarity protection diode and fuse drop).
 
5: Big shielded inductor current, low resistance, to maximize conversion efficiency. Reduce heat.
 
6: Ultra-small size, 20 (L) * 11 (W) * 5 (H) mm, the whole network to a minimum.
 
7: Ultra-low quiescent current, quiescent current of 0.85 mA. Connected to the car battery without adding switches can be connected to the cigarette lighter line or the ACC power cable line.
 
8: Output Integrated adjustable and fixed voltage, fixed output does not need customization, direct can be very voltage, potentiometer can adjust, versatility is very strong on the board under the spot welding
 
9: Integration enabled port, default mode of operation, low close, bring convenience to control
 
10: 78 series can be used to replace linear regulators, such as 78057812, and so on.

Performance Parameter
Working voltage: 5V
Total resistance: 100KΩ
Terminal voltage: -5~5V
Number of taps: 100
Interface mode: CS, U/D, INC
Resistance increase mode: linear
Working current: 3mA
Package: 8SOIC
Temperature: -40~ 85 °C
Tap position is automatically saved when power is off
Functional Description
Temperature compensation function, resistance error between terminals: ±20%
Sliding position data can be saved for a long time, 100 years
Higher resistance resolution: 1%
The changes in the digital potentiometer are stepped or incremental, and the resistance changes linearly.
E.g
X9C104, with a resistance range of 40R-100K, is divided into 100 steps, and the increment of each tap point is 1010R.

Features: Support sampling frequency (kHz):8 / 11.025 / 12 / 16 / 22.05 / 24 / 32 / 44.1 / 48
Support file format:MP3/WAV Support Micro SD card, Micro SDHC Card 30 class adjustable volume UART TTL serial control playback mode, baud rate is 9600bps Power supply can be 3.2 ~ 5.2VDC
Size:43mm x 25mm

Specification:
1. The power indicator LED and switch trigger timing indication LEDs; 2. The output can be connected to AC 250V 10A DC 30V 10A load; 3. Time delay can be adjusted, ( 0-150 seconds) 4. For applications of Vehicle equipment-delay to prevent car ignition, prevention of high sudden current to burn components and devices. 5. Size: 40x20mm 6. Working voltage: 5-12V
Package Included:
1 x Adjustable NE555 module
 

Features:
This is a great DC to DC step-up converter module for electric equipment, digital products, etc.
The boost converter can convert 2V~24V DC to maximum 28V DC, output voltage is adjustable with potentiometer.
The maximum output current can be up to 2A.
High efficiency, the conversion efficiency can be more than 93% .
Widely used for storage battery, power transformers, DIY adjustable regulated power supply, industrial equipment, 5V, 9V, 12V, 28V output, etc.
 
Specifications:
Input Voltage: 2V~24V
Max. Output Voltage: 28V
Max. Output Current: 2A
Efficiency: >93%
Size: 36*17*14mm/1.41*0.67*0.55"

Features:
This is a great DC to DC step-up converter module for electric equipment, digital products, etc.
The boost converter can convert 2V~24V DC to maximum 28V DC, output voltage is adjustable with potentiometer.
The maximum output current can be up to 2A.
High efficiency, the conversion efficiency can be more than 93% .
Widely used for storage battery, power transformers, DIY adjustable regulated power supply, industrial equipment, 5V, 9V, 12V, 28V output, etc.
 
Specifications:
Input Voltage: 2V~24V
Max. Output Voltage: 28V
Max. Output Current: 2A
Efficiency: >93%
Size: 36*17*14mm/1.41*0.67*0.55"

MPU-6500 modules (three-axis gyroscope triaxial accelerometer)
Module Model: GY-6500
Use Chip: MPU-6500
Power supply :3-5v (internal low dropout regulator)
Communication: Standard IIC / SPI communication protocol
-Chip 16bit AD converter, the output data 16
Gyro range: ± 250 500 1000 2000 ° / s
Acceleration range: ± 2 ± 4 ± 8 ± 16g
Using Immersion Gold PCB, machine welding process to ensure quality
2.54mm pin pitch
Module size 15mm * 25mm
Package Included:
1 x 6DOF MPU 6500 Sensor 6-axis Gyroscope Acceleration Module SPI/IIC For arduino

Description: 
The product is ALTERA MAX II family CPLD chip EPM240T100C5N minimum system board, together with a Byte-Blaster and USB-Blaster Download for product validation and development. JTAG and power supply interface board has been set aside, and leads to all the pins, simply connect the 5V power supply can work extremely convenient to use. The CPLD chip for the entry of low-cost CPLD / FPGA is very appropriate, the user according to the IO port of the core plate leads to expansion of the external circuitry such as: LED lights, digital tube, LCD liquid crystal, serial communications, etc. . Facilitate the users to develop their own products to maximize the learning development cost savings for the user.
Chip board EPM240T100C5
Board JTAG interface,
Active board 50MHZ crystal
With a programmable LED
With a 5V chip, 3.3V AMS1117-3.3 switch
5V power supply with switch
All the leads all the IO
The board size 5CM * 7CM
Package Included:
1  *  CPLD MAX II EPM240 Minimum System Core Board Development Board

Product Information: 
 
PAM8403 is a small digital amplifier chip, high-definition sound quality highlights the advantages of digital chips, circuit using the most reasonable peripheral configuration, power supply filtering is upgraded to 470uf (some sellers are less did not even 100uf capacitance) 1.6mm glass sheet, the real amplifier board did the most detailed, high-fidelity sound output 3W 3W, is a rare good product enthusiasts amplifier, potentiometer using original anti-meter body, life expectancy up to 15 years, potentiometer with switch can cut off the power supply directly counterclockwise, Listing has been received by the buyer! 
 
Product Name: PAM8403 digital amplifier board 
Specifications Model: GF1002 
Power range: 5v DC 
Minimum Output: 3W * 2 
Dimensions: 29.5 * 20.2 * 15mm

About A4988
Introduction:
This product is a breakout board for Allegro’s A4988 DMOS Microstepping Driver with Translator and Overcurrent Protection; please read the A4988 datasheet carefully before using this product. This stepper motor driver lets you to operate bipolar stepper motors in full-, half-, quarter-, eighth-, and sixteenth-step modes, with an output drive capacity of up to 35 V and 2 A.
The translator is the key to the easy implementation of the A4988. Simply inputting one pulse on the STEP input drives the motor one microstep. There are no phase sequence tables, high frequency control lines, or complex interfaces to program.The A4988 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened.
Feature：
Simple step and direction control interface;
Five different step resolutions: full-step, half-step, quarter-step, eighth-step, and sixteenth-step;
Adjustable current control lets you set the maximum current output with a potentiometer, which lets you use voltages above your stepper motor’s rated;    
Voltage to achieve higher step rates;
3.3 and 5 V compatible logic supply
Intelligent chopping control that automatically selects the correct current decay mode (fast decay or slow decay);
Over-temperature thermal shutdown, under-voltage lockout, and crossover-current protection;
Short-to-ground and shorted-load protection.

XH-M609 DC voltage protection module Lithium battery under voltage loss, low power, disconnect output 6-60V
1. Name: Battery over-discharge protection module
2. Model: M609
3. Input voltage: DC12-36V
4. Display accuracy: 0.1V
5. Control accuracy n: 0.1V
6. Voltage error: /-0.1V
7. Scope of application: 12-36 lithium battery
8. Product size: 57*42*19mm

PL2303 PL2303HX USB to UART TTL Cable Module 4p 4 pin RS232 Converter
Feature:
USB TO RS232 TTL PL2303HX AUTO CONVERTER MODULE ADAPTER 5V OUTPUT, PROVIDES THE BEST AND CONVENIENT WAY TO CONNECT YOUR RS232 TTL DEVICES OR DEMO BRD. TO YOUR COMPUTER, VIA THE USB PORT.
 
Built-in TTL COM PC-PL2303HX Chip
 
Standard USB type A male and TTL 4 pin connector
 
Cable length: 1000mm (39 3/8 in)
 
Simple and Easy way to give USB support to your designs
 
Available for Linux, Mac, WinCE and Windows (XP, 2003), Vista, Win 7
 
Black cable-----GND
Green cable----TXD
White cable----RXD
Red cable -----VCC(5V)
​
Package included:
1 x  PL2303 PL2303HX USB to UART TTL Cable Module 4p 4 pin RS232 Converter
Packed Safely in Bubble Bag.

Features:
Introduction:
This module is based on a resistive divider principle design, make the interface terminal input voltage reduced 5 times, A rduino analog input voltage up to 5V, then the input voltage of the voltage detection module can not be greater than 5V × 5 = 25V (if used 3.3V system, the input voltage can not exceed 3.3Vx5 = 16.5V). Because A rduino AVR chips used in 10 AD, so the resolution of the analog module is 0.00489V (5V / 1023), so the voltage detection module detects a minimum input voltage of 0.00489V × 5 = 0.02445V.
Parameter:
Voltage input range: DC0-25V
Voltage detection range: DC0.02445V-25V
Voltage analog resolution: 0.00489V
Wiring:
DC input connector:
the positive terminal connected to VCC,
the negative  connected to GND
Output interface:
" " is 5 / 3.3V,
"-" then GND,
"s" A rduino connected to the AD pin
Code:
#include 
int val11; 
int val2; 
void setup() 
{   
 pinMode(LED1,OUTPUT);   
 Serial.begin(9600);   
 Serial.println("Emartee.Com");   
 Serial.println("Voltage: ");   
 Serial.print("V"); 
} 
void loop() 
{       
 float temp;       
 val11=analogRead(1);       
 temp=val11/4.092;       
 val11=(int)temp;//       
 val2=((val11% 100)/10);       
 Serial.println(val2);          
 delay(1000); 
}                    
Package Include
1 x  Voltage detection Module

This It lables for rduino Nano version 3.0,
however you can still use this adapter for the older version
(just have to remember that A0-A7 are in the reverse order).
You can use this adapter to easily hook up for arduino Nano to an outside world via hook up wires.
Board Size:5.2x3.5cm(approx)
NANO multi-purpose expansion board for For ARD UINO NANO tailored a sensor expansion board to solve the NANO when connecting a variety of sensor wiring confusing problem , as you develop For ARD UINO works of the weapon.
1 IO port leads all digital and analog IO ports, each IO port has positive and negative power supply interface standard
(2) leads to an I2C interface on the motherboard , convenient and I2C devices connected
3 . Increasing the DC power connector . NANO USB interface board supply current is actually only 50MA, to bring high-current devices, such as when the steering is obviously insufficient , this time in the DC power supply interface provides external power to ensure the stability of equipment operation .

This It lables for rduino Nano version 3.0,
however you can still use this adapter for the older version
(just have to remember that A0-A7 are in the reverse order).
You can use this adapter to easily hook up for arduino Nano to an outside world via hook up wires.
Board Size:5.2x3.5cm(approx)
NANO multi-purpose expansion board for For ARD UINO NANO tailored a sensor expansion board to solve the NANO when connecting a variety of sensor wiring confusing problem , as you develop For ARD UINO works of the weapon.
1 IO port leads all digital and analog IO ports, each IO port has positive and negative power supply interface standard
(2) leads to an I2C interface on the motherboard , convenient and I2C devices connected
3 . Increasing the DC power connector . NANO USB interface board supply current is actually only 50MA, to bring high-current devices, such as when the steering is obviously insufficient , this time in the DC power supply interface provides external power to ensure the stability of equipment operation .

This It lables for rduino Nano version 3.0,
however you can still use this adapter for the older version
(just have to remember that A0-A7 are in the reverse order).
You can use this adapter to easily hook up for arduino Nano to an outside world via hook up wires.
Board Size:5.2x3.5cm(approx)
NANO multi-purpose expansion board for For ARD UINO NANO tailored a sensor expansion board to solve the NANO when connecting a variety of sensor wiring confusing problem , as you develop For ARD UINO works of the weapon.
1 IO port leads all digital and analog IO ports, each IO port has positive and negative power supply interface standard
(2) leads to an I2C interface on the motherboard , convenient and I2C devices connected
3 . Increasing the DC power connector . NANO USB interface board supply current is actually only 50MA, to bring high-current devices, such as when the steering is obviously insufficient , this time in the DC power supply interface provides external power to ensure the stability of equipment operation .

Item specifics
Place of Origin: China (Mainland)
Brand Name: DC Converter
Size: 24x18mm
Output Current: Rated 1A-1.5A
Output Power: 1 - 50W
Type: DC/DC Converters
Input Voltage: 1-5V
Output Voltage: 5.1-5.2V
Model Number: Converter
Weight: 0.03g
Efficiency:: Up to 96%
Switching frequency:: 500KHz
Output ripple:: 30mV (MAX) 20M bandwidth
Voltage indication:: LED lights with load
Operating Temperature:: Industrial (-40°c to 85°c)
Output:: USB Output
Product Description
Feature:
Module Properties: non-isolated step-up module (BOOST)
input voltage: 1-5V
Output voltage: 5.1-5 .2 V
Output Current: Rated 1A-1.5A (single lithium input), the maximum 1.5A (single lithium input)
Efficiency: Up to 96% (the higher the input voltage, the higher the efficiency)
Switching frequency: 500KHz
Output ripple: 30mV (MAX) 20M bandwidth (input 4V output 5.1V 1A)
Voltage indication: LED lights with load (input voltage less than 2.7V LED indicator off)
Operating Temperature: Industrial (-40°c to 85°c)
Full load temperature rise: 30°c
Quiescent Current: 130uA
Load regulation: ± 1%
Voltage regulation: ± 0.5%
Dynamic response speed: 5% 200uS
Short circuit protection: None (Please use the lithium battery with protection.)
Input Reverse Polarity Protection: None
Connection: Welding
Input: IN Postive, IN-Negative
Output: USB Output
Applications: 
DIY a mobile power supply, only need one battery, you can output 5V voltage for your phone, MP3, MP4, PSP charger, very easy.
In order to power your electronic devices when your device needs 5V power supply, when you only have lithium battery, this module can be directly step-up to 5V, solve your problems. Description
1.Small PFM control DC / DC boost controller chip
2.Enter any DC voltage of 0.9V ~ 5V, can be stable output 5V DC voltage, output current of 500 ~ 600MA with two AA batteries input to a single AA battery-powered output current 200ma so, for the mobile phone, camera , single-chip, digital products supply. Stable output 5V DC voltage
3.USB female, can direct power to the USB interface device with USB female versatile
4.PCB size: 34 (mm) x16.2 (mm) ultra-small size, installed in a variety of small equipment

Name: Stepper Motor Driver Filter
Filter Size:40*30mm
Dupont Line Length:115mm
As we all know, there will  result  subharmonic oscillation during printing by using
different stepper drivers, such as A4988 DRV8825 Stepper Motor Driver.
So ,here is a device to fix this problem, eliminate  vibration stripes  effectively .
Especially on A4988 DRV8825 Stepper Motor Driver as we tested.

Product Introduction:
1.Driving Port Signal Voltage:3.6-24V
2.Output Port Voltage Port:3.6-30V
3.Jumper Cap Can Achieve Output Port Is High POtential Or Pull Down Output
4.Onboard 4-Channel 817 Are Independent:can achieve different voltage control at then same time
 
​NOTE:
The input port is shared with GND;
The output ports are independent of each other;
It  is optocoupler output.V and G will be connected after input valid signa in input port.
 

Product parameters:
Product Name: 'DAPLINK Emulator
Support chip: all chips based on Cortex-M core Operating system: windows, linux Debug interface: SWD, virtual serial port Input voltage: 5V (USB power supply) Output voltage: 3.3v Product size: 49*18mm

Machine amplifier board:
Using imported LM4881 headphone amplifier chip design, low voltage power supply (DC: 2.7v-5.5v), the output power (up to 200mw), strong drive capability. Can also be used as the power amplifier board Preamplifier.
Ultra-small size (25mm * 20mm), installation does not take up space. The overall height of only 7mm.
Working voltage: DC 2.7v-5.5v
Board size: 25mm long, 20mm high and 7mm high

Discription:
Pad Size: 69.2 x 76.9 x 0.8mm
Cable Length: 3-1/3" or 86mm (include connector)
Connector: Dupont 7 pins, 0.1" (2.54mm) Pitch
Mount Style: Self-Adherence
Max. Circuit Rating: 35VDC, 100mA
Insulation Spec.: 100M Ohm, 100V
Dielectric Withstand: 250VRms (60Hz, 1min)
Contact Bounce: <=5ms
Life Expectancy: 1 million closures
Operation Temperature: -20 to 40 °C
 
Package:
1PCS X4 x 3 Matrix Array 12 Key Membrane Switch Keypad Keyboard

USB to TTL converter UART module CH340G CH340 3.3V 5V switch for arduino downloader pro mini