Limit Switch with Lever

Rocker Switch 3A 250V On/Off SPST features:
- AC 250V 3A 2 Pin ON/OFF I/O SPST Snap in mini oscillating switch
- Rocker switch; Type: On/Off (SPST)
- Control on and off SPST and 2 terminals
- Voltage and Current: AC250V, 3A
- Overall size: ~ 1.5 x 1 x 1.7 cm/0.6"x 0.4" x 0.7 "(L*W*H)
- Mounting hole size: 1.35 x 0.8 cm/0.53"x 0.315" (L*W)
- Black

Arduino Nano A000005 is the smaller, friendlier version of Uno's badge. Perfect for IoT applications and for mobile device prototypes. This board is based on the ATmega328 and has a wide range of applications, thanks to its small size and flexibility.

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

BD139 Plastic Medium-Power Silicon NPN Transistors pack 5ps features:
Material: Silicon Polarity: N-P-N Encapsulated: TO 126 Audio amplifier, driver
VCBO collector-base voltage: 60V VCEO collector-emitter voltage: 60V VEBO emitter-base voltage: 5V Collector continuous current: 1.5A Typical gain of direct current. hfe: 40-160
Maximum power dissipation: 12.5 Watt if T <= 25ºC Working frequency: 250 MHz

Typical gain of direct current. hfe: 40-160

TP4056 Module Lithium Battery Charger with Protection features:
- TP4056 Li-Ion Micro USB Charger
- Upgraded version of previous TP4056
- Micro USB connection to charge directly from the PC
- Ideal for 18650 batteries
- Based on the TC4056A regulator
- Input Voltage: 4.5V - 5.5V DC
- Full charge voltage: 4.2V +/- 1.5%
- Max Output Current: 1A
- Overvoltage protection 4.2V
- Over discharge protection 2.4V
- LED indicator: charging blue, charging red
- Operating temperature: -10ºC to + 85ºC
- IN + and IN- connection for electronic circuits
- Overcurrent protection: 3A
- Measurements 26 x 19 x 5 mm
- Possibility of current change through Rprog

It is very easy to make it work with an Arduino, PIC or any other microcontroller.
In its output pin we will be able to measure the PWM pulse width depending on the distance of the obstacle.
HC-SR04 Ultrasonic Sensor Distance Measuring Module features:
- Supply voltage: 5V (4.5V- 6V)
- Consumption: 30 mA typical, (35 mA max)
- Interface: VCC , GND, Signal
- Range: 2 cm to 3 meters
- Angle 15º
- LED indicator of measurement in progress
- Frequency: 40 kHz for 200 µs - Size: 30mm x 20mm
- Quantity: 1 unit
Useful links for Arduino / Raspberry programming and projects with boards Arduino / Raspberry:
Automatic robot operation with obstacle detection />

White plastic wheel with silver tone metal support.
It allows a 360° rotation, provides a good resistance to rolling, wheel silently and without problems. Wheels 30mm PP 360° Rotation for Cylindrical Use features:
- Main material: Polypropylene (PP), steel
- Main color: White, silver tone
- Total size: Total height: 45mm / 1.8 "
- Wheel size: 30 x 13mm / 1.2 "x 0.5" (P * A)
- Hole diameter for mounting: 4mm / 0.16 "
- Space between holes: 28 x 22mm / 1.1 "x 0.9" (L * P)
- Size of the top plate: 38 x 32mm / 1.5 "x 1.3" (L * P)

CO2 sensor model MH-Z19C. High precision working voltage 5.0±0.1V DC. The measuring range is between 0 and 5000 ppm. It has a low power consumption. UART and PWM output.