HT12D is a series decoder IC for remote control applications manufactured by Holtek. It is commonly used for radio frequency (RF) applications. Download. Make a RF Transmitter and Receiver With HT12E & HT12D: Would you like to With the help of our friends HT12E (ENCODER) and HT12D (DECODER) and a. The HT12D is a 2^12 decoder in 18 pin DIP package. This decoder is a series of CMOS LSIs for remote control system applications. It is paired with Holtek’s.

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In the above circuit I have set the 8-bit address data as 0b, by connecting all address pins to ground. Arduino based GPS receiver.

HT12D Decoder IC

This oscillator can be used by connecting these two pins through a 1M Resistor. This high-density System-in-Package SiP integrates controller, power switches, and support components. The IC is should be powered by 5V pin 18 and the ground pin pin 9 is grounded.


These are the 8-bit address bits, which is used to protect your data. They can also be connected to LED to physically view the received data. We should set the bits in same pattern on Encoder and Decoder IC to pair them. Supply voltage; 5V 2. HT12D is a decoder integrated circuit that declder to 2 12 series of decoders. Virgin Galactic — Commercial Space Flight. A valid transmission in indicated by a high signal at VT pin.

So if you are working on a project which has to transmit a 4-bit data from one end to other either by wire or wireless then this IC pair will be best suited for you. What is Web Browser. Skip to main content.


The serial input data is compared with the local addresses three times continuously. It is not mandatory to use it.

It decodes the serial addresses and data received by, say, an RF receiver, into parallel data and sends them to output data pins. If any valid data is received they can be obtained from these four pins. For decoding a data the IC will requires an oscillatorluckily this IC has one in-built. HT12D is capable of decoding 12 bits, of which 8 are address bits and 4 are data bits. This series of decoders are mainly used for remote control system applications, like burglar alarm, car door controller, security system etc.

Interface GPS with Arduino. It is very important that your Decoder should have the same address of that of the encoder. This pin will go high when a data is received.

Can be used in Home automation for short range remote switching Safety systems like Burglar alarm system, Smoke or Fire alarm system etc. Interface SD Card with Arduino. A basic circuit diagram for the HT12D IC is shown below In the above circuit I have set the 8-bit address data as 0b, by connecting all address pins to ground. They are paired with 2 12 series of encoders. Submitted by admin on 27 October The data on 4 bit latch type output pins remain unchanged until new is received.

SPI Module of Arduino.


Choosing Motor For Robots. Choosing Battery for Robots. This pin powers the IC should use only 5V. To know how a 4-bit data can be encoded and then send to the input pin of this IC, we have to understand the working of the HT12E Encoder IC which is given here. The IC has a built in oscillator. Decover simple terms, HT12D converts the serial input into parallel outputs. The input data code is decoded when no error or unmatched codes are found.


TL — Programmable Reference Voltage.

It is mainly provided to interface RF and infrared circuits. These two ICs together form an Encoder and Decoder pair. Valid transmission; active high. This oscillator secoder be used by connecting these two pins through a 1M Resistor 17 Valid Transmission VT This pin will go high when a data is received.

HT12D Decoder IC | HT12D Datasheet | Pin Diagram

If you want security you can connect any of the 8 pins to 5V to make it high. So out of the bits 8-bits will be used to set address and the remaining 4-bit will be used to transmit data. Connected to the Decodder of circuit. The Encoded 12 bit output data obtained from HT12E has to be given here.

The 4-bit data that is received can be obtained on decodeer AD0 to AD1 and an address of 8-bit has to be set using the pins A0 to A7.