Compact Digital non-contact laser tachometer RPM DT2234C+

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 />

Connector BLS02 Female/Female 2 Pins RoHS Single Row features:
- Step between pins: 2.54 mm
- Manufacturer: Maritex
- Number of connections: 2 in a single row
- Type: female / female
- RoHS standard

The network module communicates with the Arduino type board through the SPI protocol ideal for projects with ARDUINO, PIC, AVR, STM32. ENC28J60 Ethernet LAN Network Module Mini AVR LPC STM3 features:
- Chip ENC28J60 Microchip
- Module: 10Base-T
- 3.3V power
- SPI interface
- 25Mhz speed
- LED status LED
- Hanrun network transformer
- Network Interface board HR911105A
- Operating temperature: -40ºC to + 85ºC
- Dimensions: 51 x 19 x 16 mm

NodeMcu module based on ESP8266 controller and programming in Lua language
NodeMcu is equipped with 10 GPIO, PWM, I2C, 1-wire and ADC
ESP8266-12E is an improved version of ESP8266-12
It works as a standard WiFi 802.11 b / g / n 2.4 GHz
USB Communication - CP2102 Chip
Characteristic:
ESP 12E ESP8266 ESP12E NodeMcu Lua Wireless Development Board CP2102 WiFi features:

- Supply voltage: 3.3V (LOGICAL LEVELS: 3.3V)
- Supported protocols: 802.11 b / g / n
- Network support: 2.4 GHz
- Band: 2400 (MHz) - Wi-Fi Direct (P2p), Soft Access Point
- Integrated TCP / IP stack
- PLL, regulators and integrated power management units
- Output power: 0 , 15 (W); + 19.5dBm in 802.11b mode

Characteristic: - Voltage regulator 50-220V AC 2000W
- Ideal to control the speed of AC motors
- Allows adjustment the output voltage between 50V and 220V
- Input voltage: 220V AC
- Regulation range: 50V to 220V AC
- Max current: 10A
- Max power.: 2000W
- Dimensions: 47 x 35 x 27mm

Ceramic Capacitor 100nF (0,1uF) 50v 104 PCB PIC Arduino features:

Orders only in multiples of 20 units
-Type: Ceramic Y5V
-Tolerance: +80/-20%
-Dimensions: diameter 9.5mm, pitch 5.08mm

Mini ESP8266 ESP12E CH340 WiFi Development
NodeMcu module based on ESP8266 controller and programming in Lua language
NodeMcu it is equipped with 10 GPIO, PWM, I2C, 1-wire and ADC
It works as a standard WiFi 802.11 b / g / n 2.4 GHz
Wemos D1 Mini ESP8266 ESP12E CH340 WiFi Wireless Development features:

- Compatible with Arduino, programming with the Arduino IDE
- Power supply voltage: 5V
- LOGICAL LEVELS: 3.3V
- 11 input / output pins
- 1 ADC (input: 0-3.3V)
- Supported protocols: 802.11 b / g / n
- Network support: 2.4 GHz - Band: 2400 (MHz)
- Wi-Fi Direct (P2p), Soft Access Point
- Integrated TCP / IP stack
- PLL, regulators and power management units Integrated

The 2.5mm female jack connector is a connector to provide power to computers, LED TVs, routers, etc ...
This 2.5mm female jack connector adapter soldered on a PCB board, is ideal for use in our projects.
It has connection points where we can easily solder some pins to connect it directly to a breadboard, or solder a cable over those same connection points.
Adapter 2.5mm female power jack with PCB features:
- Connector type: 2.5mm female jack ,
- Color: black,
- Nominal voltage: 12v DC,
- Maximum current: 0.5A DC,
- Insulation resistance: ‰ ¥ 100MΩ,
- Operating temperature: -25ºC to + 85ºC,
- Number of output pins: 3
- Pitch between output pins: 2.54mm.