By using the paired HT12E encoder and HT12D decoder we can transmit 12 bits of parallel data serially. HT12D simply converts serial data to its input (may be. IC HT12D can be used only with its pair HT12E. These two ICs together form an Encoder and Decoder pair. They are bit. The HT12E Encoder ICs are series of CMOS LSIs for Remote Control system applications. They are capable of Encoding 12 bit of information which consists of 8.
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These are the 8-bit address bits, which is used to protect your data.
We should set enocder bits in same pattern on Encoder and Decoder IC to pair them. Connected to the Ground of circuit. The Encoded 12 bit output data obtained from HT12E has to be given here.
The IC has a built in oscillator. This oscillator can be used by connecting these two pins through a 1M Resistor.
This pin will go high when a data is received. It is not mandatory to use it. This pin powers the IC should use only 5V. These two ICs together form an Encoder and Decoder pair. So out of the bits 8-bits will be used to set address and the remaining 4-bit will be used to transmit data. 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. The IC is should be powered by 5V pin 18 and the ground pin pin 9 is grounded.
HT12D Decoder IC | HT12D Datasheet | Pin Diagram
For decoding a data the IC will requires an oscillatorluckily this IC has one in-built. The 4-bit data that is received can be enncoder on pins AD0 to AD1 and an address of 8-bit has to be set using the pins A0 to A7.
It is very important that your Decoder should have the same address of that of the encoder.
In the above circuit I have set the 8-bit address data as 0b, by connecting all address pins to ground. If you want security you can connect any of the 8 pins to 5V to make it high.
They can also be connected to LED to physically view the received data. Envoder any valid data is received they can be obtained from these four pins.
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.
HT12D Decoder IC
Submitted by admin on 27 October This oscillator can 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. 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. Can be used in Home automation for short range remote switching Safety systems ecnoder Burglar alarm system, Smoke or Fire alarm system etc.
TL — Programmable Reference Voltage.