Best Stemedu in 2026

🚩 Baud Rate: 115200, Selectable working mode: On-board toggle switch. UART side for serial TTL debugging by AT commands, PROG for firmware programming, ESP8266 ESP-01S upgrade to 4MB Flash

🚩 After programming the esp-01 and ar-duino uno, you can program over the air (ota), that is a base function of the ESP

🚩 This ESP-01S Prog WiFi Programmer module has CH340G USB to TTL driver IC onboard, so you can easily use your computer to do ESP-01 functional debugging. ESP-01 serial wifi module can be directly plugged into the yellow pin header without any connection wires, please install driver before use it

This latest version esp-01s WiFi module with stronger signal and 4 MB Flash Memory, it is upgraded from 512KB.

About program: Please choose "Generic ESP8285 Module" board in Arduino IDE to program it.

ESP-01s adapter's PCB layout has changed for an improvement in WiFi radio performance. Compatible with Ar duino. Support 3 modes: AP, STA, AP + STA

🚩 This ESP-01S downloader is using CH340C chip, added ESP8266 auto-download circuit, it is very convinent for user to download program, update firmware, debugging.

🚩 ESP-01S Prog WiFi Programmer support Arduinos IDE, Ai-thinker ESP8266 Flasher and Espressif FLASH_DOWNLOAD_TOOLS

🚩 No need connection, no need to press button, ESP01S WiFi programmer downloader module will go into download mode automatically.

🚩 MAX7219 is an integrated serial input / output common-cathode display driver, which connects your microprocessor to a 7-segment digital LED display with 8 digits

🚩 This 8-Digit 7 segment light tube module is compatible of 5V / 3.3V microcontroller; Only three IO ports are used to drive the eight digit display

🚩 MAX7219 LED Display Tube supports flicker free displays as well as cascading displays; PCV board four corners of the fixed copper stud, which can effectively prevent short circuit accidents happen.

🚩 Momentary micro limit switch, Long straight hinge lever type switch, 1NO + 1NC (SPDT)

🚩 Excellent trip switches, long service life, more than 500,000 Cycles.

🚩 Switch Body Size (Each) : 50 x 43 x18mm/1.9" x 1.7" x 0.7"(L*W*T)

[EXTRA LARGE SIZE] This LED display size is 68cm x 12cm (26.77" x 4.72"). Large LED sign can make your text display more complete, ultra bright, visibility even in daylight.

[EASY To USE] Smartphone APP control, support IOS and Android, connected by bluetooth, no internet / Wifi required, no additional remote control required. Free App, download from App Store and Google Play. Supports multiple languages, support pattern graffiti text animation display.

[FUN & ATTRACTIVE] Clear fonts and high brightness, this programmable LED sign can make your Advertising / content attractive with less cost, get your business seen day or night, perfect for special events.

5PCS SFM-27 DC 3-24V Alarm Siren Electronic Piezo Active Buzzer, 95dB High Decibel Continuous Beep Speaker for Arduino

Acoustic piezoelectric frequency: 100dB at 12VDC/30cm

Resonant frequency: 2.5±0.5KHZ

【Plug&Play for 4K High-Def】This DisplayPort to HDMI cable is a work from home must-have that supports up to 4K@30Hz, superb clarity for view without lagging. Backward compatible with 1440P@60hz, 1080P@120hz, connecting a DP computer to any HDMI displays like TV, monitor, or projector uni-directionally. HDCP compliant for stream media.

【Metal Build, Lasts Longer】Corrosion resistant and shock-proof Aluminum alloy case helps dissipate heat faster. 24K gold-plated one-piece connectors and five-layers shielding effectively minimize signal interference, providing stunning(4k, 2160p) clarity and clear sound(uncompressed digital 7.1, 5.1 or 2 channels).

【Practical Design Details】Embraced by sturdy Nylon braided jacket, this Display Port to HDMI cord withstands bend test of 16,000+ times without reducing cable flexibility or compromising the best performance possible. Latch-free DP head avoids damaging your device receptacle when carelessly unpluged.

Protect any electronic device from power surges & spikes: White surge protector with six outlets protects your PC, personal computer, laptop, printer, scanner, router, phone, fax, modem, television, lamp or any other Home/office electronics from dangerous power surges, spikes & line noise

Premium surge protection with metal housing: This White surge suppressor provides six widely spaced NEMA 5 15R outlets which are arranged in 3 exclusive isolated filter banks to limit Noise interaction among connected equipment; The extra-long 6 foot AC Power cord acts like an extension cord to give you the flexibility to reach distant outlets, while its right angle NEMA 5 15P flat plug allows furniture and equipment to be moved flush against the wall to save space

Safety first high joule rating conforms to UL 1449 safety standards: An integrated 12A circuit breaker protects all outlets and shuts down connected equipment in case of overload; Diagnostic LEDs confirm power, protection and line fault status at a glance; 3330 joules mean maximum protection for your equipment; Conforms to current UL 1449 3rd edition safety standards

Protect any electronic device from power surges & spikes: Surge protector with two outlets protects your personal computer, laptop, printer, scanner, router, phone, fax, modem, television, lamp or any other home/office electronics from dangerous power surges, spikes & line noise

Premium surge protection with built in tel/dsl and gold coax jacks: This surge suppressor offers complete ac protection with twelve total nema 5 15r outlets, while built in RJ11 and 22GHertz gold coax jacks prevent surges from damaging your modem, phone, cable and satellite equipment 6 feet telephone cable is included

Safety first high joule rating conforms to UL 1449 safety standards: An integrated 12a circuit breaker protects all outlets and shuts down connected equipment in case of overload; Diagnostic LEDS confirm power, protection and line fault at a glanced; 2880 joules mean maximum protection for your equipment; Conforms to current UL 1449 3rd edition safety standards

Home and Office AC surge suppressor protects your computer/laptop, home theater system and other devices from a voltage spike and more

2160 joule surge suppression rating with EMI/RFI line noise filtering to help components perform at their peak while extending their lifespan

Specially designed outlets accommodate 3 transformers without blocking remaining outlets

RJ45 Coupler Usage: This extender is ideal for extending ethernet connection by connecting 2 short network cables together.

Plug and play, no drivers are required. High Speed Data Transfer.

Safe and Secure : With nickel plated contacts and easy snap-in retaining clip, the coupler ensure a secure and corrosion free connection.

With this USB to TTL adapter, you can establish communication with your board/MCU through your computer. Maximum transmission speed up to 3Mbps

The main chip is FT232RL from FTDI ,High stability. LED indicator for TX,RX,Power,It is very useful when you are debugging or downloading.

Pin Definition: CTS,RTS,RXD,TXD,GND,VCC;Support VCC output 3.3V and 5V, switch by jumper.

【Extend Your HDMI Cables Effortlessly】UGREEN HDMI coupler female to female is an ideal solution for extending the length of your HDMI cables when using a projector, Xbox, or when equipment is far from the screen. Simply connect two HDMI cables with the coupler to create a single, continuous HDMI cable.

【Experience Unmatched Picture Quality】Experience the ultimate in picture quality with our 4K HDMI female to female adapter. This 4K HDMI female to female adapter supports 4K@60Hz and is backward compatible with 4K@30Hz, 1920*1080@60Hz, you'll never miss a detail. This HDMI adapter also supports ARC, 3D and dolby vision, making it perfect for an immersive audio and visual experience.

【Stable and Reliable Transmission】With a bandwidth of 18Gbps and gold-plated connectors, this HDMI coupler offers stable and reliable transmission. The sound is perfectly in sync with the picture, and there's no delay.

Serial adapter allows a serial device to be connected to a USB computer

Plug-and-play convenience:DB9 serial port is seen as a COM port by your computer, and is available for use by any program that accesses COM ports

No need for an external power adapter:draws power directly from your computer via the USB connection

80 Plus Platinum: Runs cooler and uses less power than less efficient power supplies

Fully Modular: Allows user to only use the cables they need for a cleaner looking build with better airflow

10-year warranty: Backed by Corsair's legendary technical support and customer service

Harness 750 continuous watts In SFX form, perfect for the most power-dense small-form-factor PCs

Ensures ultra-high efficiency operation for less excess heat and lower operating costs

Flexible Para cord sleeved cables make routing and cable management incredibly easy

FTDI FT232RL IC:Built-in original FTDI FT232RL IC. Supports 5V, 3.3V and 1.8V Logic TTL levels,You can switch Logic levels by jumper.

Protective case: Come with a transparent protective casing, this transparent protective casing to effectively prevent static interference from the hand and prevent unintentional short circuit.

Application:Support EEPROM, Vendor ID re-write, unbrick routers ,program ESP8266 module, interface to GPS modules, flash firmware on hard drive, update transmitter, interface to set top box and other compatible UART interface devices

How it works: This USB to rs232 adapter connects to serial devices via a USB port, such as serial digital cameras equipped with DB9, label writers, handheld computers, barcode scanners, PDAs, etc. This USB to serial adapter is widely used in shopping malls, offices, etc.

Multi-system compatibility: This usb to serial adapter is compatible with Win 7 8 10 Win XP Vista Mac OS Linux system. It would automatically update the driver for Win8 and above. For windows 7, Mac OS, please install the CD driver in the package. Note: Linux only supports the use of kernel version 2.6-5.2.

Multi-device compatibility: This USB to rs232 adapter is suitable for computers (computers or laptops) to connect various RS232 serial devices, such as cash registers, LED and LCD text displays, digital cameras, POS, Bar code scanners, door control system, printers, CNC controllers, scanners, etc.

MAXIMIZED PORTABILITY: This USB to serial RS232 adapter with FTDI features a single cable design removing the need for additional adapters and cables

CORRECT DTE/DCE CONFLICTS: Convert your available USB port into a null modem RS232 DB9 serial port, resolving any DTE/DCE conflicts

BROAD COMPATIBILITY: Compatible with your USB 1.0 or 2.0 ports, this RS232 converter works with your Windows, Mac or Linux systems

External Hard Drive Enclosure: This 3.5" hard drive enclosure easily connects your 3.5 /2.5 inch hard drive to a PC, laptop, and other devices for massive data transfers and up to 20TB portable storage. Hard drive enclosure protects a hard disk from scratches and maximizes the use of 3.5"/2.5" HDD/SSD for comprehensive protection of valuable data.

5Gbps High Transfer Speeds: Get 5Gbps transfers with the HDD enclosure. Supported by UASP accelerated transmission protocol, it gets speeds 70% faster than traditional standalone USB 3.0 readers. Backward compatible with USB2.0 and USB1.1 ports.

Interlligent Chip & Better Protection: Built-in with interlligent chip for better performance and high-quality ABS to hold hard drives firmly. Soft rubber strips provide anti-shock protection. Pre-set heat emission holes allow for excellent heat dissipation. Auto-Sleep mode ensures an extended lifespan for your hard drives.

Product name : DB9 Serial adapter; terminal wire range : 12-24AWG

Design : Screw Type;Total Size : 58 x 35 x 21mm/2.3" x 1.4" x 0.83"(L*W*H)

Cable Hole Dia. : 5mm/0.2'' 6mm/0.23'' 7mm/0.27'' 10mm / 0.4";Material : Metal,Electric Part

Product name : DB9 adapter; terminal wire range : 12-24AWG

Design : Screw Type;Total Size : 58 x 35 x 21mm/2.3" x 1.4" x 0.83"(L*W*H)

Cable Hole Dia. : 5mm/0.2'' 6mm/0.23'' 7mm/0.27'' 10mm / 0.4";Material : Metal,Electric Part

How it works: This USB to rs232 adapter connects to serial devices via a USB port, such as serial digital cameras equipped with DB9, label writers, handheld computers, barcode scanners, PDAs, etc. This USB to serial adapter is widely used in shopping malls, offices, etc.

Multi-system compatibility: This usb to serial adapter is compatible with Win 7 8 10 Win XP Vista Mac OS Linux system. It would automatically update the driver for Win8 and above. For windows 7, Mac OS, please install the CD driver in the package. Note: Linux only supports the use of kernel version 2.6-5.2.

Multi-device compatibility: This USB to rs232 adapter is suitable for computers (computers or laptops) to connect various RS232 serial devices, such as cash registers, LED and LCD text displays, digital cameras, POS, Bar code scanners, door control system, printers, CNC controllers, scanners, etc.

MULTI-USE FUNCTIONALITY: Use this versatile USB to serial RS232 adapter for everything from digital signage to connecting point of sale systems and barcode scanners.

CUSTOMIZABLE SOLUTION: This USB serial hub features an FTDI chipset, making it highly customizable and compatible, and the ideal solution for any setup.

COMPACT DESIGN: Designed with a small form factor, this serial RS232 converter is USB powered and requires no bulky power adapters or an outlet.

Product name : DB9 Serial adapter; terminal wire range : 12-24AWG

Design : Screw Type;Total Size : 58 x 35 x 21mm/2.3" x 1.4" x 0.83"(L*W*H)

Cable Hole Dia. : 10mm / 0.4";Material : Metal,Electric Part

How it works: This USB to rs232 adapter connects to serial devices via a USB port, such as serial digital cameras equipped with DB9, label writers, handheld computers, barcode scanners, PDAs, etc. This USB to serial adapter is widely used in shopping malls, offices, etc.

Multi-system compatibility: This usb to serial adapter is compatible with Win 7 8 10 Win XP Vista Mac OS Linux system. It would automatically update the driver for Win8 and above. For windows 7, Mac OS, please install the CD driver in the package. Note: Linux only supports the use of kernel version 2.6-5.2.

Multi-device compatibility: This USB to rs232 adapter is suitable for computers (computers or laptops) to connect various RS232 serial devices, such as cash registers, LED and LCD text displays, digital cameras, POS, Bar code scanners, door control system, printers, CNC controllers, scanners, etc.

Suitable for variety of pin connections required to use serial communications industrial control products ,all-copper base, contacted better and more antioxidative

High quality PCB carrier, all signal ports named and labeled clearly

No soldering needed! This is SO convenient. Case can be prevent short circuits

Product 1: MAXIMIZED PORTABILITY: This USB to serial RS232 adapter with FTDI features a single cable design removing the need for additional adapters and cables

Product 1: CORRECT DTE/DCE CONFLICTS: Convert your available USB port into a null modem RS232 DB9 serial port, resolving any DTE/DCE conflicts

Product 1: BROAD COMPATIBILITY: Compatible with your USB 1.0 or 2.0 ports, this RS232 converter works with your Windows, Mac or Linux systems

Add an RS232 serial port with circuit isolation to your laptop or desktop computer through USB

1 Port FTDI USB to Serial RS232 Adapter Cable with Isolation

USB to RS232 Serial Adapter Cable