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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Remember I said check power? I wondered whether these processors were still available – they are!
Tony EE rocketscientist 62k 2 21 Pabitha Pabi 25 June at Using the Raspberry Pi to control. The GPIO pin acting as the trigger function needs connecting via an inverter circuit.
The encoder HT12E is capable of encoding information comprising 12 bits in total; 8 address bits and 4 data bits. Add decoupling caps close to the IC.
Use staples for power and ground rails. I’m working on a similar circuit. 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. Email Required, but never shown. Don’t use wire with thick insulation.
Best practice of using the breadboard is to use short solid wire leads and neatly connect flush to the board without large inductive loops.
ClearAll set A ht12f to ”. Keep IC’s close toegether and imagine that it is a printed circtuit board layout. Try to get thin solid wire 24 AWG I believe.
For fun here is a free tool to help design, layout and simulate. The output from the encoder can be used in various ht21e for example to feed a Radio Frequency or infrared transmitteror it could be directly connected to a decoding processor. Number 99 entered quits the script. I have experimented further with this, connecting LEDs to the HT12D decoder data pins to ensure the transmitted and received data is presented correctly.
RF Remote Based Dc Motor Driver Using HT12E & HT12D
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. Avoid long jumper wires bt12d all costs. And the picture of the circuit done: I see you do not have jumpers to join each side of the power rails. Sign up using Facebook.
ht12d & ht12e | EngineersGarage
Yah but I agree. 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. I’ve never tried this before but looks ok. Newer Post Older Post Home. All is working now, thanks to all. Did you really need to post that many images without the full URLS, no less? That means you need an inexpensive multimeter to do this.
The outputs from the HT12D decoder can be used to switch connected logic circuitry or other attached devices via suitable interfaces. It would be possible to control literally hundreds of external devices this way. 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.
Trigger send trigger pulse. I have referenced this before in an earlier blog and the direct link is: I know but, and I’m going to sound like Olin here it should be easy to see how inconvenient it jt12d, even for a new user. Note there is a gap on both sides down the middle for the Blue and Red outer rails. Posted by Nigel Cleaver at So, you are saying, when you grounded all the pins on the left of HT12D and 12E, it worked?
The transmission of the data stream can be over an RF link or direct connection using 2-core cable.