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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ElectronicAdventures: Data Encoder/Decoder HT12E/HT12D

Email Required, but never shown. Try to get thin solid wire 24 AWG I believe. I see you do not have jumpers to join each side of the power rails. I wondered whether these processors were still available – they are!

I’m working on a similar circuit. Posted by Nigel Cleaver at Guilherme Garcia da Rosa 2 3 7. Avoid long jumper wires at all costs. Keep IC’s close toegether and imagine that it is a printed circtuit board layout. So, you are saying, when you grounded all the pins on the ht112d of HT12D and 12E, it worked? 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 The outputs from the HT12D decoder can be used to switch connected logic circuitry or other attached devices via suitable interfaces. ClearAll set A ports to ”. Sign up using Email and Password. Note there is a gap on both sides down the middle for the Blue and Red outer rails. I htt12e 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.


Post as a guest Name. 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.

HT12E Encoder circuit The basic circuit arrangements for the encoder: Did you really need to post that many images ut12d the full URLS, no less? The encoder HT12E is capable of encoding information comprising 12 bits in total; 8 address bits and 4 data bits. 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.

Don’t use wire with thick insulation. It would be possible to control literally hundreds of external devices this way. I’ve never tried this before but looks ok. Use staples for power and ground rails. 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 ht12e 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.


Trigger send trigger pulse.

ht12d & ht12e

All is working now, thanks to all. That means you need an inexpensive multimeter to do this. Newer Post Older Post Home.

The transmission of the data stream can be over an RF link or direct connection using 2-core cable. 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 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. 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. Using the Raspberry Pi to control. Add decoupling caps close to the IC.