Battery Holder R6 LR06 4+4 8x AA 12V

12V electric drill, with ON/OFF switch with 2 grinding tips, 2 burrs, 4 nozzles

10x Electrolytic Capacitor 470uF 16V 105ºC PIC Arduino features:
-Type: Electrolytic Capacitor
-Assembly: intern
-Value: 470uF
-Maximum tension: 16V
-Maximum temperature 105º C
-Dimensions: 8x12mm
-Quantity: 10 units

Laminated Copper Clad Prototype PCB Circuit Board 30x19cm.

Momentary Switch Push Button Red N/O 7mm features:
- Momentary pushbutton N/O (normally open)
- Red button
- Dimensions approx. 7 mm x 27 mm
- Recessed with nut and washer
- Load current (supported): 1A to 230V / 2A to 125V
- Drill to embed: 7 mm +/- 0.2
- Operating temperature: -55º to +85ºC

It has an Atmega328P chip running at 16Mhz with a factory loaded bootloader.
The Uno R3 module has all connectors than the Arduino Uno R3 and is compatible with all Arduino shields.
Plate UNO R3 CH340 + Arduino compatible switches features:

- ATmega328P chip at 16MHz with crystal external quartz
- ATmega328P microprocessor with socket
- Operating voltage: 5V
- Input voltage (recommended): 7-12V
- Input voltage (limits): 6- 20V
- Clock speed: 16 MHz
- Digital I / O Pins: 14
- Analog input pins: 6
- DC current per I / O Pin: 40 mA
- DC Current per Pin 3.3V: 50 mA
- Flash32 KB of which 0.5 KB are used by the bootloader -Atmega328
- SRAM 2 KB - Atmega328

In the case of a battery pack, the BMS (Battery Management System) balancing protection circuit allows charging and discharging to be individually controlled. That is, the circuit controls that all cells are charged and discharged at approximately the same voltage. The current during charging should be limited, because the cell will "absorb" the current given to it, but a higher current than the one established by the manufacturer (generally a safe current is 1C ) can cause the cell to overheat and, in extreme cases, explode. The same relationship also applies to discharge.

Resistor 1K Ohm 5% 0,25W 1/4W features:
-1 unit - 1K Ohm
-Type: Carbon film
-Tolerance: ±5%
-Power: 0.25W
-Dimensions: 2x7mm

Microcontroller ATMEGA8A-PU ATMEGA8 DIP-28 Atmel features:
- Series: AVR® ATmega
- Core processor: AVR
- Package / box: 28-DIP (0.300 ", 7.62 mm)
- Core size: 8 bits
- Speed: 16MHz
- Connectivity: I²C, SPI, UART / USART
- I / O Number: 23
- Type of memory of the program: FLASH 8kB
- EEPROM size: 512B
- RAM size: 1kB
- Voltage - Supply (Vcc / Vdd): 2.7 V ~ 5.5 V
- Data converters: 10bit A / D
- Type of oscillator: internal
- Operating temperature: -40 ° C ~ 85 ° C
- RoHS: Yes
- Quantity: 1 unit