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CP2102 5PIN
Features:

PCB size: 26.5mm * 15.6mm
PCB Color: Red
Weight: 4g
With resettable fuse. In the event of accidental short-circuit can effectively protect your device and computer USB port to download
With three LEDs: power indicator, the indicator data reception, data transmission indicator, work status at a glance
3.3V and 5V with two power output
All the useful lead pins
With reset signal output can be directly Pro mini and other Ard  uino board to download!

PL2303HX
Features:

Dimention: about50x15x7mm
Net weight:5g
Package weight:15g
Color:Blue

CH340G
Features:

Built-in USB to TTL Transfer chip.
Designed to be used for USB to TTL electronic projects.
TTL interface output, easy to connect to your MCU.
Status LED.
Dual 3.3V and 5V Power output, work with 3.3v and 5v target device.
Size:55mm * 16mm

RM4.00
  • Standard size of 4mm diameter
  • Plugs can be stacked 
  • Screw connector fitting
RM0.85
  • Used for rain detection  and rainfall intensity
  • Adjustable sensitivity though a potentiometer
  • Lower the resistance (more water), the lower the voltage
  • Operating voltage: 5V
  • Output LED indicator
RM4.20

Specification:

  • Digit: 1/2/3/4
  • Color : Red (Ultra-Bright )
  • Mode : Common-Cathode (CC)/Common-Anode(CA)
  • Category : LED 7-Segment Display
RM0.50
  • Type: 18650
  • Nominal voltage: 3.7V
  • Size: 18*65(mm)
  • Nominal capacity:  2000mAh/2500mAh/3200mAh/3350mAh
RM7.50

NE555 IC /JRC555

  • 4.5V to 16V supply
  • 8-pin DIP package
  • Timing from microseconds to hours
  • Adjustable duty cycle

NE555 Module

  • board NE555 chip
  • single-channel signal output, the output duty cycle of about fifty percent of the square wave
  • onboard adjustable resistor, adjust the resistance can control the output frequency
  • the onboard power indicator
  • Operating voltage: 5 ~ 12V
  • board size: 29 (mm) x12 (mm)
RM0.90
  • Accurate I2C real-time clock 
  • Operating voltage: 3.3 - 5.5V
  • Clock chip: High-precision clock chip DS3231
  • Programmable square-wave output
RM10.20
  • High quality
  • 16 column x 2 row character LCD
  • Yellow
  • 5x8 dot characters
  • Operate on 5V power supply
  • Adjustable contrast and brightness
RM8.90
  • Model: AD16-22DS
  • Operating voltage: 12v DC
  • Color: Yellow, Blue, Green, Red, White
  • Luminescent material: high brightness
  • LED Lamp head diameter: 30mm
  • Installation hole diameter: 22mm
RM2.00

Product parameters:

Name: Safety Banana Socket
Specifications: 4mm*30mm
Material: Nickel-plated brass
Color: Red Black Yellow Green Blue
Opening: 12mm
Insulator: ABS

RM2.00
  • Automatic irrigation module DIY kit soil moisture detection automatic water pumping
RM15.00
  • In pack of 4 pieces
  • Size: AA
  • Super Heavy Duty
  • Carbon Zinc
  • Voltage: 1.5V
  • Diameter: 14.5mm
  • Height: 50.5mm
  • Model: GP 15PL R6P
  • 0% Mercury
RM2.00
  • Color: Amber (Tawny)
  • Thickness: 0.06mm
  • Length: 33M
RM3.80