Pin Number. Pin Name. These are the 8-bit address bits, which is used to protect your data. We should set the bits in same pattern on Encoder and Decoder IC to pair them.
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Mostly remote control applications have this technology. It gets to interface with the third device and helps it to decode bits data. In this decoder, only 4-bits are data the remaining part is the address. The address will describe the location but 4-bits combination could make 16 types of different combinations. The HT12D decoder can not work alone. It works with another counterpart called an encoder. To receive the data between encoder and decoder address bits should be matched.
The encoder can with any CMOS technology. Most modern applications use the encoder for decoding due to its simplicity and efficiency. The device comes in multiple packages. Almost all packages have the same pins but some of them have some extra pins.
All the usable pins of HT12D are:. This pin is known as the VT pin which means valid transmission. Pin18 will go high to indicate that the data has received. It is not necessary to use this pin. In most of the applications, this pin left unconnected. The power input on this pin should be according to the specification otherwise instead of making IC functional the power will burn it.
A single IC can decode up to bit data without using any third device. Valid transmission helps the external device to learn about decoding status. RF Decoder Electrical Specifications 2. The recommended and mostly used operating voltages with IC is 5V. The oscillator frequency of the decoder is KHz with 51K ohm resistor at 5V.
The decoder operating temperature range is to 75 degree but it also can store the temperature of to degrees. First, connect the power supply. Then connect it to the message receiving module which can be an RF receiver or IR receiver. After that connect the decoder with the receiving device. Keep the VT pin high on the IC. Most of the time VT kept high to indicate the valid transmission.
The address pins will use to give the address. All address pins represent an 8-bit address. In case of no state on any pins, the decoder would not be able to work properly. The 8-bits message could be a simple message or a complex one. Then, the output pin will connect to the external device which should work on different inputs. In the last attach the ohm resistor with the decoder. In this example, we will learn how the RF module communicates with the decoder. The output of the RF will attach to the decoder.
RF receiver will receive the message in bits. The message then bit will generate a corrupt output. In the whole circuit, the address pins mostly attach to the ground. In a secure communication system, it is recommended to select an 8-bit code for secure communication.
All same address bits mostly represent the open communication system. The RF module can replace with an IR receiver. The HT12D is not only specific to a single transmitter and receiver. The incoming signal then gives the output on the base of the address.
If the first 8-bits of the input data gets a match with the 8-bit of the decoder then there will be output data. Otherwise, there will not be any output on the decoder. As we know the address is 8-bit and they make combinations. In most of the devices, a variable address is used to decode a message. The decoder address will be variate through an external node that is attached to the third circuit. If the user will be kept changing it then there will be output on the decoder in case any bit signals get a match.
This variable address feature sometimes allows the device to be controlled by an unknown person. In HT12D there are some security risks but most of the companies still prefer it due to its speed and performance. Notify me of follow-up comments by email. Notify me of new posts by email. Table of Contents. Pin1 to Pin8 are address pins. In case of using any special address, the specific logic can be applied. The limit of logical voltages should not exceed these pins. Microcontroller and microprocessors can directly initialize the address to the HT12D.
Pin 9 is the ground pin. The ground pin will make common ground with power supply and external ground. Common ground will help the decoder to operate with external devices and modules. Pin10 to Pin13 is the data pin of HT12D. The output data will be in the form of logical voltage. A total of 4 bits will come up with 16 different combinations. All these combinations will be the only available data on these pins.
Pin14 is the data input pin of the HT12D Decoder. The data input will be of bits. In most of the applications, RF and IR modules relate to it. IC will operate according to the external clock. Pin15 will connect to the oscillator input and pin 16 will connect to the oscillator output. The oscillator will generate the pulse according to which the device will operate. Pin 17 is an indication pin for data. HT12D uses Pin 19 for power input.
HT12D RF Decoder IC
Post a comment. I wondered whether these processors were still available - they are! I began to think about how I could use this technology with the current range of micro-controllers such as the Arduino and the Raspberry Pi, together with other potential uses. I also thought it would be a great opportunity to fully investigate the operation of the two processors to help me better understand how I might use these in the future.
Make a RF Transmitter and Receiver With HT12E & HT12D
Here we go, in this instructable i'll show you mi basic rf transmitter and receiver ready to be used! Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. Pin Asignement of receiver direction, it mean it can changing of adresses for comunication individualy if is needed.