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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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The GPIO pin acting as the trigger function needs connecting via an inverter circuit.

Add decoupling caps close to the IC. ClearAll set A ports to ”. Home Questions Tags Users Unanswered. 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.

ElectronicAdventures: Data Encoder/Decoder HT12E/HT12D

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 hy12e 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.

Using the Raspberry Pi to control. Keep IC’s close toegether and imagine that it is a printed circtuit board layout. I wondered whether these processors were still available – they are! Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you yt12d read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


Remember I said check power? So, you are saying, when you grounded all the pins on the left of HT12D and 12E, it worked? 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. I have experimented further with this, connecting LEDs to the HT12D decoder data pins to ensure the transmitted and received data is presented correctly.

Note there is a gap on both sides down the middle for the Blue and Htt12d outer rails. It would be possible to control literally hundreds of external devices this way. Number 99 entered quits the script. Use staples for power and ground rails. Sign up using Email and Password. I’ve never tried this before but looks ok.

ht12d & ht12e | EngineersGarage

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. I haven’t drawn any circuits for this as the h12e is straight forward as both the Raspberry Pi and the HT12E operate at 3. Avoid long jumper wires at all costs.

I’m working on a similar circuit.

Newer Post Older Post Home. 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.

ht12d & ht12e

And the picture of the circuit done: 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. I have referenced this before in an earlier blog and the direct link is: Post as a guest Name.

HT12E Encoder circuit The basic circuit arrangements for the encoder: Email Required, but never shown. Sign up or log in Sign up using Google.


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.

That means you need an inexpensive multimeter to do this. Tony EE rocketscientist 62k 2 21 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. The encoder HT12E is capable of encoding information comprising 12 bits in total; 8 address bits and 4 data bits.


RF Remote Based Dc Motor Driver Using HT12E & HT12D

Pabitha Pabi 25 June at For fun here is a free tool to help design, layout and simulate. 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. Best practice of using the breadboard is to use short solid wire leads and neatly connect flush to the board without large inductive loops.

The transmission of the data stream can be over an RF link or direct connection using 2-core cable. Sign up using Facebook. I see you do not have jumpers to join each side of the power rails. All is working now, thanks to all. Trigger send trigger pulse.