Adapter module CH340G LC Technology -TTL UART 5V series

Ideal for connecting TTL RS232 devices to your PC through the USB port. PL2303HX PL2303 USB to UART TTL Cable Module RS232 Converter 4 Pin features:
- Compatible controller PL2303HXA
- 4 pins: 5.0V (red), TxR (green), RxD (white), GND (black)
- 2.5A self-recovery protective fuse
- Supported OS: Win8, Win10, WinME, Win2003, Win XP, Vista, Win 7 The 64-bit Prolific drivers provided by Microsoft through Windows Update will not work with most adapters and will therefore generate the generic "Code 10" error.

An RS232 serial port to your PC through the USB port USB 2.0 A Serial Port Cable Adapter DB9 RS232 Series features:
- CH341 driver
- Supported OS: WinME, Win2003, Win XP, Vista, Win 7, Linux, MAC OS9.0/OSX
- High quality, shielded cable
- Power and data in the same cable, does not require more adapters
- Compatible USB interface 1.1 and 2.0
- Support up to 1 mega data transfer
- Length 73cm The adapter allows you to connect a computer with: - Electric meters
- Decoders, programmers
- Cash registers
- Satellite TV
- Control panels
- Mobile phones
- Diagnostic interfaces for cars
- The administration of Cisco routers

Ideal for connecting TTL RS232 devices to your PC through the USB port. USB to A RS232 UART TTL 5V Converter + Cables features:
- Compatible controller PL2303HX
- 5 pins: 3.3v, 5.0v, TXR, RDX, GND
- Heat shrinkable insulating cover
- LED indicators of data transmission
- 2.5A self-recovery protective fuse
- Supported OS: WinME, Win2003, Win XP, Vista, Win 7, Linux
- Weight: 40 gr. (approx.)

TTL level conversion module 5V 3.3V IO Single Interchange Compatible I2C SPI.
Use of high-speed dual-level IT supply level translator chip design. TTL Level Converter 5V - 3.3V IO LJ245A features:
- Main chip: Octal bus transceiver and change from 3.3-V to 5-V with outputs of 3 states LJ245A of Texas Instrument
- VCCA power supply voltage: 4.5 - 5.5 VDC
- VCCB power supply voltage: 2.7 - 3.6 VDC
- Low level input voltage V (IL): 0.8 V
- High-level input voltage V (IH): 2 V
- Low level output current I (OL): 12 - 24 mA
- High level output current I (OH): -24 - -12 mA
- 8 channels allow the conversion of the IO communication level
- Channel levels A and B are controlled by VCCA and VCCB

Mini RS232 to TTL Adapter Max3232 Converter features:
- Converter for RS232 to TTL levels
- MAX3232CSE chip
- Voltage: 3V a 5V
- Speed: no more than 120kbps
- Dimensions: 16x9mm

The PCF8591 is a low-power 8-bit single-chip, single-chip, 8-bit data acquisition device with four analog inputs, an analog output, and an I2C serial bus interface.
Three address legs A0, A1 and A2 are used to program the hardware address, allowing the use of up to eight devices connected to the I2C bus without additional hardware.
Address, control and data to and from the device are transferred in series through the two-way bidirectional I2C bus. Analogue to Digital Converter PCF8591T features:
- Main chip: PCF85911
- Operating voltage supply: 2.5 - 6 V
- Low standby current
- Serial input / output through the I2C bus
- 3 hardware address pins A0, A1, A2
- Sampling speed given by the I2C bus speed

Converter RS232/485/422 to Ethernet RJ45 has been designed for the industrial environment. It combines multiple functions including serial server, Modbus gateway, MQTT gateway, RS485 to JSON, etc. The module has an RS232/485/422 and Ethernet port (PoE function).Suitable for applications such as data acquisition, IoT gateway, IoT security. and smart device monitoring.

A standard IEEE1284 DB25 parallel port to your PC via the USB port. Transmission speed reaches 12 Mbps. This cable is "USB Printing Support" port and not Parallel "LPT Printer Port" 

Connecting a 3.3V device to a 5V system is a challenge.
The bidirectional logic level converter is a small device that safely drops the signals from 5V to 3.3V and increases 3.3V to 5V at the same time.
This level converter also works with 2.8V and 1.8V devices. What really separates this logic level converter from our previous versions is that it can successfully set its high and low voltages and go up and down between them safely on the same channel.
Each level converter has the ability to convert 4 pins on the high side to 4 pins on the low side with two inputs and two outputs provided for each side. The level converter is very easy to use. The board needs to be powered from the two sources of voltage (high voltage and low voltage) that your system is using.

The ADS1115 is an external 16-bit ADC + a built-in programmable gain amplifier (or PGA), which can be very useful for certain Arduino and ESP8266 projects. This is ideal when more resolution or more analogue pins are required. You get better accuracy, as well as relieving the processor of this burden.