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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Trigger send trigger pulse. So, you are saying, when you grounded all the pins on the left of HT12D and 12E, it worked?

RF Remote Based Dc Motor Driver Using HT12E & HT12D

Sign up using Facebook. Did ht12r really need to post that many images without the full URLS, no less? Sign up using Email and Password. Avoid long jumper wires at all costs. 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.

And the picture of the circuit done: Add decoupling caps close to the IC. All is working now, thanks to all. I’ve never tried this before but looks ok. 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. Pabitha Pabi 25 June at With the possibilities of using hh12e 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.


For fun here is a free tool to help design, layout and simulate. Posted by Nigel Cleaver at I haven’t drawn any circuits for this as the interfacing is ht21d forward as both the Raspberry Pi and the HT12E operate at 3. By using our site, you acknowledge that you have read h12d understand our Cookie PolicyPrivacy Policyand our Terms of Service.

HT12E Encoder circuit The basic circuit arrangements for the encoder: It would be possible to control literally hundreds of external devices this way. I have experimented further with this, connecting LEDs to the Ht12r decoder data pins to ht122e the transmitted and received data is presented correctly.

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ElectronicAdventures: Data Encoder/Decoder HT12E/HT12D

Best practice of using the breadboard is to use short solid wire leads and neatly connect flush to the board without large inductive loops. I have referenced this before in an earlier blog and the direct link is: Sign up or log in Sign up using Google. Using the Raspberry Pi to control. 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.

Keep IC’s close toegether and imagine that it is a printed circtuit board layout. ClearAll set A ports to ”. Remember I said check power? The GPIO pin acting as the trigger function needs connecting via an inverter circuit.

The outputs from the HT12D decoder can be used to switch connected logic circuitry or other attached devices via suitable interfaces. 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. Guilherme Garcia da Rosa 2 3 7. Try to get thin solid wire 24 AWG I believe. 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.


I see you do not have jumpers to join each side of the power rails. Email Required, but never shown. 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.

Post as a guest Name. The encoder HT12E is capable of encoding information comprising 12 bits in total; 8 address bits and 4 data bits. Note there is a gap on both sides down the middle for the Blue and Red outer rails.

The transmission of the data stream can be over an RF link or direct connection using 2-core cable. Use staples for power and ground rails.

Newer Post Older Post Home. 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. Tony EE rocketscientist 62k 2 21