{"product_id":"hc-12-433mhz-wireless-serial-module-1km-si4438","title":"HC-12 433MHz Wireless Serial Module 1km Range | SI4438","description":"\u003ch2\u003eHC-12 433MHz Wireless Serial Module – Up to 1km Transparent Data Transmission\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eHC-12 Wireless Serial Module\u003c\/strong\u003e is a compact, easy-to-use 433MHz RF communication module designed for reliable long-range wireless data transmission up to \u003cstrong\u003e1 kilometer\u003c\/strong\u003e. Built around the powerful \u003cstrong\u003eSI4438 chip\u003c\/strong\u003e, it enables seamless serial communication between microcontrollers, Arduino boards, Raspberry Pi, and other embedded systems — all without the clutter of wires.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're building a remote sensor network, a DIY home automation project, a robotics system, or a wireless telemetry application, the HC-12 delivers stable, transparent data transfer you can depend on.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrequency Band:\u003c\/strong\u003e 433.4 – 473.0 MHz (100 selectable channels)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTransmission Distance:\u003c\/strong\u003e Up to 1,000 meters (open air)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCore Chip:\u003c\/strong\u003e Silicon Labs SI4438 for high sensitivity and low power consumption\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterface:\u003c\/strong\u003e Standard UART serial (TTL level) — plug-and-play with Arduino, STM32, Raspberry Pi, and more\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBaud Rate:\u003c\/strong\u003e Configurable from 1,200 to 115,200 bps\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e 3.2V – 5.5V DC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTransparent Data Transmission:\u003c\/strong\u003e Pass-through serial data with no additional protocol overhead\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAT Command Configuration:\u003c\/strong\u003e Easily set frequency, baud rate, power, and sleep modes via AT commands\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Form Factor:\u003c\/strong\u003e Ideal for embedding in enclosures and custom PCBs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Power Modes:\u003c\/strong\u003e Multiple sleep modes for battery-powered applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × HC-12 433MHz Wireless Serial Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eArduino \u0026amp; Raspberry Pi wireless projects\u003c\/li\u003e\n  \u003cli\u003eHome automation and smart device networking\u003c\/li\u003e\n  \u003cli\u003eRemote sensor data collection\u003c\/li\u003e\n  \u003cli\u003eWireless robotics control\u003c\/li\u003e\n  \u003cli\u003eIoT (Internet of Things) prototyping\u003c\/li\u003e\n  \u003cli\u003eDrone and RC communication links\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatible With\u003c\/h3\u003e\n\u003cp\u003eArduino Uno, Arduino Mega, ESP8266, ESP32, STM32, Raspberry Pi, and virtually any microcontroller with a UART serial interface.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/round-aluminum-wire-diy-jewelry-making-1mm-3mm\"\u003eRound Aluminum Wire 1mm–3mm | DIY Jewelry Making Wire\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/glow-in-the-dark-natural-stone-round-beads-diy-jewelry-making\"\u003eGlow in the Dark Natural Stone Round Beads | DIY Jewelry Making\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.epa.gov\/recycle\/used-lithium-ion-batteries\" target=\"_blank\" rel=\"noopener\"\u003eEPA guidance on lithium-ion battery handling\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the HC-12 433MHz Wireless Serial Module and what is it used for?\u003c\/h4\u003e\n\u003cp\u003eA: The HC-12 is a 433MHz wireless UART serial communication module based on the SI4438 chip. It is widely used in DIY electronics, Arduino projects, IoT prototyping, home automation, robotics, and any application that requires long-range wireless serial data transmission of up to 1 kilometer in open air.\u003c\/p\u003e\n\u003ch4\u003eQ: How do I configure and use the HC-12 module?\u003c\/h4\u003e\n\u003cp\u003eA: The HC-12 module connects via a standard UART (TTL serial) interface to your microcontroller. Configuration is done through simple AT commands — just pull the SET pin LOW and send commands via serial to adjust frequency channel, baud rate, transmit power, and operating mode. No special libraries are required for basic transparent data transmission.\u003c\/p\u003e\n\u003ch4\u003eQ: Is the HC-12 module compatible with Arduino and Raspberry Pi?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The HC-12 operates at 3.2V–5.5V and uses standard TTL serial, making it fully compatible with Arduino Uno, Arduino Mega, Raspberry Pi, ESP8266, ESP32, STM32, and most other microcontrollers or single-board computers with a UART interface.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the maximum range of the HC-12 wireless module?\u003c\/h4\u003e\n\u003cp\u003eA: In open-air conditions with the default settings, the HC-12 can achieve wireless transmission distances of up to 1,000 meters (approximately 1 km). Range may vary depending on obstacles, interference, antenna quality, and power settings.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the HC-12 433MHz Wireless Serial Module and what is it used for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The HC-12 is a 433MHz wireless UART serial communication module based on the SI4438 chip. 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