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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Best practice of using the breadboard is to use short solid wire leads and neatly connect flush to the board without large inductive loops. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I have referenced this before in an earlier blog and the direct link is: So, you are saying, when you grounded all the pins on the left of HT12D and 12E, it worked?

The GPIO pin acting as the trigger function needs connecting via an inverter circuit. I’ve never tried this before but looks ok. Email Required, but never shown. I haven’t drawn any circuits for this as the interfacing is straight forward as both the Raspberry Pi and the HT12E operate at 3.

Post as a guest Name. ClearAll set A ports to ”. Sign up or log in Sign up using Google. Newer Post Older Post Home. Tony EE rocketscientist 62k 2 21 I wondered whether these processors were still available – they are!

Yah but I agree. Did you really need to post that many images without the full URLS, no less?

I have experimented further with this, connecting LEDs to the HT12D decoder data pins to ensure the transmitted and received data is presented correctly. For fun here is a free tool to help design, layout and simulate. Use staples for power and ground rails. 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.


And the picture of the circuit done: Trigger send trigger pulse.

ElectronicAdventures: Data Encoder/Decoder HT12E/HT12D

The transmission ht12f the data stream can be over an RF link or direct connection using 2-core cable. 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. Home Questions Tags Users Unanswered.

Remember I said check power? 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.

Guilherme Garcia da Rosa 2 3 7. Using the Raspberry Pi to control. Try to get thin solid wire 24 AWG I believe. Note there is a gap on both sides down the middle for the Blue and Red outer rails. That means you need an inexpensive multimeter to do this. Don’t use wire with thick insulation. I see you do not have jumpers to join each side of the power rails. 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.

HT12E Encoder circuit The basic circuit arrangements for the encoder: 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.


Avoid long jumper wires at all costs. I’m working on a similar circuit. The outputs from the HT12D decoder can be used to switch connected logic circuitry or other attached devices via suitable interfaces. Posted by Nigel Cleaver at 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 Ht112d need to have 20 times the resistence of the receiver, in other words 50k and 1M resistors.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that htt12d have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to ut12d policies. Keep IC’s close toegether and imagine that it is a printed circtuit board layout.

Sign up using Facebook. 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.

RF Remote Based Dc Motor Driver Using HT12E & HT12D

Sign up using Email and Password. Add decoupling caps close to the IC. All is working now, thanks to all. Pabitha Pabi 25 June at I know but, and I’m going to sound like Olin here it bt12e be easy to see how inconvenient it is, even for a new user.