A4988 + RepRap Radiator

Flexible Coupler 5mm/5mm Z-axis CNC 3D Printer features:
- High quality flexible aluminum coupler with which you can connect Nema 17, 5mm stepper motors to a 5mm threaded rod
- They incorporate 4 captive screws so that you can perfectly fix the couplings to the rod
- Material: Aluminum alloy
- Coupler height (L): 25 mm
- Outside diameter: 18mm
- Shaft diameter: 5mm

Characteristic:
- Tolerance: +/- 20%
- Power: 0.125W

Connector BLS03 Female/Female 3 Pins RoHS Single Row features:
- Step between pins: 2.54 mm
- Manufacturer: Maritex
- Number of connections: 3 in a single row
- Type: Female / Female
- RoHS standard

Definition of the Hall effect: When a current passes through a bar of semiconductor (or conductive) material, and if an induction magnetic field B is applied perpendicularly to the direction of current flow, a voltage, called the Hall voltage, proportional to the magnetic field, and the current appears on the side faces of the bar.
This voltage is proportional to the speed of movement of the charge carriers, It is considerably higher in semiconductor materials than in metal conductors. Magnetic Sensor Characteristic: - Input Voltage: 3.8-30VDC - Output current: 40mA
High output current capacity -40 mA maximum absolute
Quad-Hall design virtually eliminates static mechanical effects
Magnetic compensated temperature - Digital current sinking output

  - 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: micro USB female 

It is made up of a 16-character, 2-row, 6-button display.
The display is compatible with the HD44780 controller and is connected in 4-bit mode so it can be used directly through the Arduino LiquidCrystal library.
Ideal to navigate through the different parts of the configuration or map. Keyboard Shield 16x2 LCD screen for Arduino features:
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- 2x16 LCD with blue backlight and white characters
- Potentiometer to modify the LCD contrast
- 5-push-button keyboard + RESET
- Use of the minimum possible channels
- Full compatibility with Arduino UNO and Mega
- The display is compatible with the HD44780 controller
- Response time: 30 ms
- Size: 80 x 60 x 22 mm

All ports and slots on the case can perfectly match Raspberry Pi 4 Model B.