Gravity: Analog pH Sensor/Meter Kit V2

Digital microscope with 500x zoom, 8 LED lights and support for microscope included.
Discover the emotion of a completely new microscopic world, totally hidden from the naked eye.
This USB digital microscope can magnify objects up to 500 times its original size and uses a dynamic image sensor and eight super bright white LED lights to create detailed images.
Connect the microscope to your computer via USB and admire each image on your screen.
You can see details like skin pores, individual cotton threads, milky clouds or amber inside THC crystals or even small scratches in a collectable coin that would be impossible to detect with the naked eye, can be easily seen with this amazing USB digital microscope.

IOBIT expansion board for the micro:bit minicomputer. Allows connection to all minicomputer outputs via a pin strip.  

Easily convert water level to analog signal
The analog output signal can be read directly on the Arduino board
Characteristic:
- Operating voltage: 3.3V -5 V
- Consumption: less than 20 mA - Sensor type: Analog
- Operating temperature: 10º C -30º C
- Detection area: 40 mm x 16 mm
- Dimensions: 60 mm x 20 mm

Characteristic:
- Channels: 4 (independent protected by Optocouplers)
- Supply Voltage: 5V
- Output Current: 10A
- Relay activation current: 15mA ~ 20mA
- Isolation: Yes
- Indicator LED: For each channel
- Dimensions: 54x 72mm
- 5V Optocoupled 4-Channel Relay Module
- This module can be directly controlled by the microcontroller (Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL)
Useful links for Arduino / Raspberry programming and projects with Arduino / Raspberry boards:
User manual for the remote control + 4-channel 315 MHz IC2262 receiver:
- Relay Module Programming 5V 10A 4 Channel with remote control + 4 channel receiver

DS3231 Precision RTC Real Time Clock Module AVR ARM features:
- Can be used in projects of Arduino, Raspberry Pi, PIC, AVR
- Function compatible with the DS 3231
- Power supply voltage: +2.3 V to +5.5 V
- Temperature range: -40 ° C to + 85 ° C
- Low energy consumption
- Full clock calendar functions that include seconds, minutes, hours, date, month and year and valid until leap year compensation
- Two alarm calendar
- Interface: I2C

The 28BYJ-48 has everything you need to start using stepper motors in your project
A stepper motor converts digital impulses into small steps of movement in one direction The engine also comes with a ULN2003 engine controller card
Can control two DC motors or a bipolar stepper motor with a maximum amperage of up to 500 mA
Equipped with state indicator LEDs A, B, C, D 5V Stepper Motor 28BYJ-48 + ULN2003 Driver Boat features:
- Engine model: 28BYJ-48
- Phases engine: 4
- Operating voltage: 5V
- Frequency: 100 Hz
- Operating current: 200mA
- Max Power: 20W
- Winding resistance: 70 ohm
- Angle per step: 5,625º
- Steps per round: 64
- Torque: 0.3 Kgr / cm
- Speed: 1900 rpm

2 Channel Relay Module DC 12V 10A Low/High Trigger for Arduino features:
- Channels: 2 (independent protected with Optocouplers)
- Supply voltage: 12V
- Output Current: 10A
- Relay activation current: 15mA ~ 20mA
- Insulation: Yes
- Trigger signal type jumper (low / high)
- LED indicator: For each channel
- Dimensions: 40x 50mm
- Has a jumper that allows to choose type of trigger signal (low / high)
- This module can be controlled directly by the microcontroller (Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL)

40x Female-Female Cable 20cm features:
-Length: 20cm
-Quantity: 40 wires
-Dupont female connectors on both ends
-Compatible with 2.54mm male connectors
-High quality and good working condition
-Easy to install and use