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It is a bit decoder that uses 8-bits for address and 4 for data. RF and IR modules can interface with microcontrollers directly which requires a little bit complex programming. In addition, This encoder IC is easy to implement and simple to use. It comes in 18 and 20 pins. Both packages have only 18 functional pins. Furthermore, This encoder will use the logic states as data and address inputs. In short, HT12D is the most suitable decoder for HT12E because both are bits and have the same number of address and data pins.
The primary function of the encoder is to encode the bit parallel input data and then forward it towards the output pin. In these bits, 8 of them will come from the address pins and the rest of them will be from data input pins. The address pins are eight in numbers which describe the address of encoded signal. Most of the devices attached to the encoder only broadcast the signal.
The broadcasted signal has an address that gets identified by the decoder to receive the data. The address is like a security for the communication system. In those cases where two receiving end or sending ends have the same address, then devices start messing with each other.
The next part is the data pins. These pins are 4 in number and these four pins describe the data in the encoded signal. The encoded signal gets the address and data in the form of logic states mostly. Due to the availability of microcontrollers and other smart devices the input signal can be applied through their GPIO pins.
To use the encoder with external devices always check for their voltages otherwise the encoder can be destroyed. The HT12E gives the ability to control the transmission with the external signals. Most of the time the control pin remains active but in special security cases, this can be controlled.
The encoder signal always encodes with the oscillator speed. The output data of the encoder will be in serial form. This serial data can be sent through a wire or by any third device like IR of RF etc. To use the encoder the following general circuit is:. In remote HT12E is widely available. You may notice that there are multiple buttons on the remote and each of them delivers a different function.
Each button of the remote sends the different data input on the encoder and then the encoder passes it to the output pin. These addresses make them operate with their desired devices. Here the IR transmitter circuit with encoder but the same circuit can be generated for RF just by replacing the IR transmitter. In addition to the above example circuit, You can also see this example on IR transmitter and receiver interfacing with Arduino. The HT12E uses the address to transmit with the transmitted data.
This address can only be from combinations of 8-bits. This makes the device limited. In most of the cases, the generated signal has a theft issue. Because the signal is broadcasted and unable to trace the receive.
The address of the signal can be guessed by any receiver. This address limitation makes the use of the HT12E suitable only at a shorter distance. At a shorter distance, the send and receiver can view each other, like the TV remote, Home Security, etc. In most of the cases, the address pins use the same logic state and work and avoid to take a complex address as an input.
You may notice in commercial products, some remote control cars can be operated with a single remote at a time. Because they are designed for shorter distance and the company to avoid the complex address input and given the same address to all the devices.
Notify me of follow-up comments by email. Notify me of new posts by email. Table of Contents. Pin1 to Pin 8 is the address pins. The logic state on these pins will set the 8-bit address. The 8-bit address comes with a total of different combinations. Any of the combinations is useable as an address. Most of the time, all these pins attached to the ground or power which makes all the address bits the same. It is suitable in case of open communication.
A specific address should be using secure communication. Pin 9 is a common ground pin of the encoder. The ground pin needs to attach with an external device to make it operatable with encoder. Pin 10 to pin 13 are the data pin of the encoder. The encoder transmits bit data which has 8-bit of address and 4-bits of data. These pins are usable with any microcontroller or IC because only the logics state requires for data input on the data pins. Pin 14 is known as transmission enable pin.
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. Pin 15 is an oscillator output pin of the encoder. An external oscillator is usable at the OSC2 pin. Pin 16 is an oscillator input pin of the encoder. OSC1 pin will use with the external oscillator input or the second terminal of the 1M resistor.
Pin 17 is a data output pin of HT12E. Pin 18 is a power input pin of the encoder. Voltages on this pin will make the IC functional.
HT12E RF Encoder IC for wireless communication
It is a bit decoder that uses 8-bits for address and 4 for data. RF and IR modules can interface with microcontrollers directly which requires a little bit complex programming. In addition, This encoder IC is easy to implement and simple to use. It comes in 18 and 20 pins. Both packages have only 18 functional pins.
Make a RF Transmitter and Receiver With HT12E & HT12D
They are capable of Encoding 12 bit of information which consists of 8 address bits and 4 data bits. Each address and data input is externally programmable or fed in using switches. These ICs are paired with each other. The Decoder receive the serial address and data, transmitted by a carrier using an RF transmission medium and gives output to the output pins after processing the data. Your Cart.
HT12E Datasheet PDF
They are capable of Encoding 12 bit of information which consists of N address bits and N data bits. This ICs are paired with each other. The Decoder receive the serial address and data from its corresponding decoder, transmitted by a carrier using an RF transmission medium and gives output to the output pins after processing the data. Model: RKI