This project has been design around HT12E and HT12D encoder / decoder chips from Holtek. With jumper selectable address on the receiver. 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. By using the paired HT12E encoder and HT12D decoder we can easily transmit and receive 12 bits of parallel data serially. HT12E simply converts 12 bit.

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HT12E Encoder circuit The basic circuit arrangements for the encoder: The transmission of the data stream can be over an RF link or direct connection using 2-core cable. Add decoupling caps close to the IC. Note there is a gap on both sides down the middle for the Blue and Red outer rails.

Avoid long jumper wires at all costs. It would be possible to control literally hundreds of external devices this way. I’ve never tried this before but looks ok. Sign up using Email and Password.

ht12d & ht12e

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. It could be said that this is a very convoluted way to use this technology but it was really useful to experiment and prove that it was possible. I have experimented further with this, connecting LEDs to the HT12D decoder data pins to ensure the transmitted and received data is presented correctly.


Thanks for all your gt12d, after studying a little bit into the RF module I found out my problem, the left side of both encoder and decoder are the Address PIN, which means they will only communicate if those addresses are the same, that was what I was making wrong, I left them all at 1 and changed the resistors in them both cause the TX need to have 20 times the resistence of the receiver, in other words 50k and 1M resistors. I know but, and I’m going to sound like Olin here it should be easy to see how inconvenient it is, even for a new user.

The output from the encoder can be used in various ways; for example to feed a Radio Frequency or infrared transmitteror it could be directly connected to a decoding processor.

ClearAll set A ports to ”. So, you are saying, when you grounded all the pins on the left of HT12D and 12E, it worked?

Number 99 entered quits the script. Home Questions Tags Users Unanswered. Yah but I agree. Sign up using Facebook. Guilherme Garcia da Rosa 2 3 7. Best practice of using the breadboard is to use short solid wire leads and neatly connect flush to the board without large inductive loops.

Posted by Nigel Cleaver at I have referenced this before in an earlier blog and the direct link is: All is working now, thanks to all. Sign up or log in Sign up using Google.


Post as a guest Name. That means you need an inexpensive multimeter to do this.

ht12d & ht12e | EngineersGarage

The encoder HT12E is capable of encoding information comprising 12 bits in total; 8 address bits and 4 data bits. Try to get thin solid wire 24 AWG I believe. By clicking “Post Your Answer”, you acknowledge that you have read our hht12d terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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For fun here is a free tool to help design, layout and simulate. With the possibilities of using multiple decoders HT12D all ‘listening’ on their individually configured addresses it is possible for the Raspberry Pi or Arduino to control both the address values and control the use of the data pins. Pabitha Pabi 25 June at Use staples for power and ground rails.

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