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TTGO W5500 Ethernet Gateway Module Board

Support TCP, UDP, ICMP, IPv4, ARP, IGMP, PPPoE protocol
Integration of the data link layer, physical layer
Support the wakeup
Support high speed serial peripheral interface (SPI model 0, 3)
Internal 32K bytes receive buffer
The embedded 10BaseT/100BaseTX Ethernet physical layer (PHY)
Support auto negotiation (10/100-Based full duplex or half duplex)
The working voltage of 3.3V, I/O and 5V voltage signal

$12.06 $14.23

TTGO T-Koala ESP32 WiFi Bluetooth Module 4MB Development Board Based ESP32-WROVER-B

Espressif official ESP32-WROVER-B module
ESP32 version: REV1
FLASH: 4MB
Lithium battery interface, 500mA charging current
Compatible with Arduino, MicroPython
Default firmware: new MicroPytho
Microcontroller: ESP-32
Board power: (USB) 5V

$14.23 $17.08

Waveshare 25515 Round 2D Codes Scanner Module Barcode/QR Code Reader, With LED Indicator

Suitable for barcode scanning applications such as elevators.
Use advanced image recognition algorithms to easily decode various one-dimensional or two-dimensional codes.
Onboard UART interface, which can be easily integrated into various embedded devices.
Compact size and high integration
Resolution: 640 x 480
Scanning angle: horizontal 70 degrees, vertical 55 degrees, rolling 360 degrees
Scan mode: induction, continuous
Accuracy: one-dimensional code is greater than or equal to 5mil, two-dimensional code is greater than or equal to 10mil

$29.76 $36.01

3592-2B DIY Mini DC-DC 12V To 5V Step Down Power Supply Module

The USB port 5V power supply can be converted to 12V output (the output port needs DIY welding). With boost converter circuit, stable quality
This model is an improved version, using professional boost chip, larger shielding inductance and Schottky diode, it is more stable to use
Product use: USB 5V power supply can be converted to 12V output, power cord of DIY car driving recorder, electronic dog can be connected, and power supply for some 12V household equipment with power of 10-12W.
Interface type: USB input x 1
Input interface: USB
Output interface: wiring board
Input voltage: 5V
Input current: 2A-3A

$6.41 $7.88

10 PCS KY-040 360 Degree Rotary Encoder Module

Material: Electronic components + PCB
Working voltage: 5V
Number of pulses per revolution: 20
The rotary encoder can count the number of output pulses during rotation in the forward and reverse directions by rotation. Unlike the potentiometer, the rotation count is unlimited. With the buttons on the rotary encoder, it can be reset to the initial state, that is, counting from 0.
Working principle: The incremental encoder is a rotary sensor that converts the rotational displacement into a series of digital pulse signals. These pulses are used to control angular displacement. The conversion of angular displacement in the Eltra encoder uses the photoelectric scanning principle. The reading system is based on the rotation of the radial index disc (code disc) composed of alternating light-transmitting windows and opaque windows, and is simultaneously illuminated vertically by an infrared light source, and the light projects the image of the code disc onto the surface of the receiver . The receiver is covered with a layer of diffraction grating, which has the same window width as the code wheel. The receiver's job is to feel the changes produced by the rotation of the disc, and then convert the light changes into corresponding electrical changes. Then the low-level signal is raised to a higher level, and a square pulse without any interference is generated, which must be handled by an electronic circuit. The reading system usually uses a differential method, that is, comparing two different signals with the same waveform but a phase difference of 180 in order to improve the quality and stability of the output signal. The reading is formed based on the difference between the two signals, thereby eliminating interference.

$8.94 $10.91

2 PCS Landa Tianrui LDTR-WG0116 2 in 1 DC 2A Booster Board Module

The adjustable boost module, can be easily installed in a variety of small equipment inside.
Output current: 2A.
Input voltage: 2-24V.
Output voltage: 5 - 28V.
Conversion efficiency: 93 percent.

$4.05 $4.82