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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Did you really need to post that many images without the full URLS, no less? Best practice of using the breadboard is to use short solid wire leads and neatly connect flush to the board without large inductive loops.

Use staples for power and ground rails. Using the Raspberry Pi to control.

And the picture of the circuit done: It would be possible to control literally hundreds of external devices this way. The transmission of the data stream can be over an RF link or direct connection using 2-core cable. For fun here is a free tool to help design, layout and simulate. Note there is a gap on both sides down the middle for the Blue and Red outer rails. I’m working on a similar circuit. I have referenced this before in an earlier blog and the direct link is: I have included a simple Python3 script below, which prompts the user to enter a number between 0 and 15, and using Binary Coded Decimal, sets the AD8 – AD11 pins to convey the user entered number correctly.

Sign up or log in Sign up using Google. Pabitha Pabi 25 June at I have experimented further with this, connecting LEDs to the HT12D decoder data pins to ensure the transmitted and received data is presented correctly. HT12E Encoder circuit The basic circuit arrangements for the encoder: Sign up using Email and Password.


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.

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ht12d & ht12e

Avoid long jumper wires at all costs. Add decoupling caps close to the IC. That means you need an inexpensive multimeter to do this. I wondered whether these processors were still available – they are! I’ve never tried this before but looks ok. 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.

ElectronicAdventures: Data Encoder/Decoder HT12E/HT12D

Home Questions Tags Users Unanswered. I see you do not have jumpers to join each side of the power rails. Try to get thin solid wire 24 AWG I believe. So, you are saying, when you grounded all the pins on the left of HT12D and 12E, it worked? Yah but I agree. All is working now, thanks to all.

Post as a guest Name. Remember I said check power? Email Required, but never shown. Sign up using Facebook. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Thanks for all your awnser, 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.


The outputs from the HT12D decoder can be used to switch connected logic circuitry or other attached devices via suitable interfaces. Trigger send trigger pulse. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

It could be said hf12d this is a very convoluted way to use this technology but it was really useful to ht1d and prove that it was possible. Tony EE rocketscientist 62k 2 21 ClearAll set A ports to ”.

I haven’t drawn any circuits for this as the interfacing is straight forward as both the Hr12d Pi and the HT12E operate at 3. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The GPIO pin acting as the trigger function needs connecting via an inverter circuit. Number ht12ee entered quits the script. Don’t use wire with thick insulation.