Transmission enable pin allows the data to transmit from data input to data output pins. It only acts as a switch which allows controlling the transmission of data with the use of external devices. OSC2 Pin 15 — Pin 15 is an oscillator output pin of the encoder. An external oscillator is usable at the OSC2 pin. OSC1 Pin 16 — Pin 16 is an oscillator input pin of the encoder.
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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 has a wide range of operating voltage from 2. Pull the Transmission Enable pin pin 14 to ground to activate transmission. For decoding a data the IC will requires an oscillator, luckily this IC has one in-built. The 4-bit data that has to be sent has to be given to the 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 also have this same address for them to talk to each other.
A basic connection diagram for the HT12E 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. If you want security you can connect any of the 8 pins to 5V to make it high. They can also be connected to switches to manually send and receive data. In this image I have made all four data bits as zero low , when this is decoded we will get the same kind of bits on the output side of HT12D, similarly we can make any changes on these 4-bits and they will be reflected on the output side of the HT12D decoder IC.
The encoded bit can be obtained from the Dout pin pin This data should be sent to the HT12D for decoding, it can either be sent directly through a wire or by using a wireless medium like RF or IR. You can know to set up the HT12D after this from here. Can be used in Home automation for short range remote switching Safety systems like Burglar alarm system, Smoke or Fire alarm system etc..
HT12E RF Encoder IC for wireless communication
HT12D RF Decoder IC:
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