Black DIP Switch 2 Positions 2.54mm Step 4 Pins

Ethanol alcohol sensor module.
MQ gas sensor uses a small indoor heater with an electrochemical sensor.
When the alcohol molecules in the air comply with the electrode the ethanol "changes" into acetic acid and then more current is produced.
MQ-3 Alcohol Sensor Module Ethanol Breathalyzer features:
- Main chip: alcohol sensor MQ-3 and comparator LM393
- Working voltage: 5V
- Current: 150mA
- Digital output: TTL 0/1
- Analog output: analog voltage sensing value
- Detection concentration:
- 0.05mg/L - 10mg/L
- Quick response features:
- Adjustable sensitivity with the potentiometer
- Size: 32mm x 20mmx 18mm

NFC RFID Keychain Tag 13.56 MHz features:
- 32 bit unique code
- Protocol: ISO14443
- Compatible with NFC Mifare 1k
- Memory: 1kB EEPROM
- Operating frequency: 13.56MHZ
- Communication speed: 106Kboud
- Reading distance: 2.5-10CM
- Reading time: 1-2MS
- Working temperature: -20ºC to 85ºC
- Number of uses 100,000 times
- Data retention: 10 years
- Material: ABS
- Dimensions 40.5 x 32 x 4.2 mm

Buzzer alarm to convert electrical to acoustic signals in robotics devices and Arduino projects.
Buzzer 5V Active Buzzer 4 to 7V DC features:

- Input voltage: 4V to 7V
- Diameter: 12mm
- Height: 9.5mm
- Spacing Pins: 7.6mm
- Maximum Current:

Housing for 16x2 character LCD screens.
The screen is fixed to the housing with 4 screws.
1602 LCD display case features:

- Transparent acrylic shell,
- Includes screws,
- Dimensions: 90x40x55mm.

SIM800L GPRS GSM SIM Board Quadband features:
Package includes:
- SIM800L module,
- 2x pin headers,
- Spring antenna,
- 3G PCB antenna - 15cm cable.
- Supported SIM format: Micro SIM.

Screen OLED 1.3" B Blue 128x64 SPI/I2C features:
- Oled 1.3 "128 * 64 pixel display
- Drive IC model SH1106
- Power: 3V-5.5V - Viewing angle: 160 degrees
- SPI interface (I2C can be changed)
- Low consumption 0.08W
- Use temperature: -20 to 70 ºC
- PCB board dimensions: 40 x 37mm
OLED technology offers high contrast, significantly improves screen black and energy efficiency - very low power consumption. Applications: - Due to the size, quality and consumption of smart watch products, portable meters, medical devices, portable players, etc.

High-quality membrane keyboard, with 16-key matrix, ultra-thin, less than 1mm thick, with adhesive system on the reverse side.
Ideal for your Arduino projects, but can also be used with other microcontrollers.
Matrix Membrane Keyboard 4x4 Modulo features:

- Rating circuit, Max: DC 35V 100 mA
- Cable length: 85 mm
- Dupont 8 pin connector
- Specific insulation: 100 M Ohm, 100V
- Useful life: + 1 million uses
- Contact parting:

- It has an Atmega328P chip running at 16Mhz with factory-loaded bootloader
- The Uno R3 module has all the Arduino Uno R3 connectors and is compatible with all Arduino shields
Characteristic:
- ATmega328P 16MHz chip with external quartz crystal
- Microprocessor: ATMega328P
- Operating voltage: 5V
- Input voltage (recommended): 7-12V
- Input voltage (limits): 6-20V
- Clock speed: 16 MHz
- Digital I / O pins: 14 (6 with PWM)
- Analog input pins: 6
- DC current for Pin I / O: 20 mA
- Flash32 KB of which 0.5 KB are used by the bootloader - AtMega328P
- SRAM 2 KB - AtMega328P
- EEPROM 1 KB - AtMega328P
- Communication: USB female Type B