433MHz Mini Receiver Built-in Learning Code 1527 Decoding 4 Channel Output

Muy buen artículo, ideal para proyectos de electronica.

There appears to be no way of keying the transmitter to send a binary number 0. D0 to D3 are discreete on/off control lines only and in my experience can not be used for binary data.

I really like the QIA chip hardware, and this is a good manifestation of it at a very reasonable price. I bought it for the transmitters and am not using the receivers at the moment. I use the relay switch receivers all over my backyard on a number of disparate lights and sound systems. I have one remote with ten buttons to integrate the yard, but it is not enough buttons anymore. I'm currently building a 20 button remote using two of the transmitters from this kit. A great solution that I prototyped and successfully tested. They draw about 20uA from a 12v battery until you depress a key. How much they draw when you press a key is dependent on what LED indicators you have, but it it typically 20mA or thereabouts.

As mentioned in another review, the pinouts don’t match up. Here is what I found: Pin Out Correlations: XMTR -> RCVR 1 -> D2 2 -> D3 3 -> D1 4 -> D0 VT: This pin goes high (VCC) when either a signal is received or when the red LED on the PCB turns on - it seems to be the same line. VT could be used as an interrupt signal to a MCU which then could determine which DO - D3 lines are active. MODE memory retention: Yes, the receivers retain the MODE setting between power cycles. Setting the MODE is a little tricky; basically you do the following: 1) RESET the RCVR to clear the MODE and forget any XMTR IDs: Press the LEARNING button 8x Expect RCVR LED flash 7x Wait 3 seconds 2) Set the MODE: Press the LEARNING button 1 or 2 or 3 times depending on the mode you want to set Wait 3 seconds Expect the RCVR LED to turn OFF (*1) 3) Learn the XMTR ID: Press the LEARNING button 1x Expect RCVR LED to turn ON Press any button on a XMTR PCB Expect the RCVR LED to turn OFF NOTE(*1) These devices are very touchy about the timing of the LEARNING button presses. You’ll need to fiddle around with them to get them to work. Sometimes the RCVR will go into learn mode after a few seconds at the end of step 2 above (i.e the PCB LED turns ON) - if this happens just press any button on an XMTR. However, once the MODE is set the RCVR can learn or re-learn one or more XMTR ID codes. Issues: 1. As shown in the picture, of the 6 pieces I received 1 of the RCVRS needed to have the flux removed. No big deal, but I suggest you keep and eye on this issue as contaminates can stick to flux. 2. The pins on the XMTR PCBs are too short to work with a standard protoboard. As shown I needed to solder a pin header strip to extend them. If you are mounting these on a PCB this won’t be a problem. 3. MODE setting is a bit touchy Overall, these are very nice well built little 4-Channel XMTR/RCVRs. Even with the above issues I’ll give it 4/5 stars because they seem stable once configured and, to me, they inspire some intriguing circuit applications.

Hard to tell if they were already paired since the 3 transmitters and 3 receivers came in one plastic bag. The qiachip web page has reasonable pairing instructions and wiring diagrams, but they are a little hard to find. The receiver diagram is overly complicated, all it really needs is power and optionally an led connected to a receiving channel pin. The transmitter needs power and a method of grounding a pin (channel) you want to transmit on. The transmitter and the receivers can be paired and tested without the antennas, at least at short distances. Both have red leds which will light up on pairing and transmission/receiving.

Works good

I really wanted these to work but had stability issues which appeared to be antenna related. I could (with effort) get them to work without an antenna in very close range (like the supplier's video which also does not appear to have antennas connected). I could not get them to work at all with the supplied spring-like antennas. I tried an assortment of other antenna designs with varying results. The best I found was a simple 1/4 wave (~17.3cm) mono-pole wire antenna but there were still dead spots and sensitivities to surroundings that made them unusable for my application. It seemed like the matching pi network on the TX was not fully populated so maybe that was part of the issue and maybe with a network analyzer and more time I could have come up with a well matched antenna design for both but I'll save that for some time when I am bored. One of the 3 receivers did not work with any of the various antenna designs I tried so my guess is it was just DOA. While this would have been a useful design (i.e. no uC required), having spent way too much time trying to make them work reliably I decided to just go back to a simple "dumb" superheterodyne TX/RX + Nano with RadioHead library. That QUICKLY provided a robust/reliable connection with good range using similar spring antennas which fit my projects limited space requirements.

This is apparently some weird module to record codes from 433mhz remotes. I thought it was a plain old receiver and transmitter set. All you can find are weird videos on how to set up remotes with some weird unrelated receiver device. Nobody needs 'learning mode', i just wanted a transmitter/receiver. Go with tried and true, hiletgo . Completely useless in many ways. Disappointed I wasted my money on this trash

I LOVE THESE LITTLE TX RX UNITS. THE MODES WORK PERFECTLY. I HAVE ONLY USED IN THE SAME ROOM FOR NOW. BE CAREFUL NOT TO GIVE THESE GUYS REVERSE POLARITY. THATS A DISASTER AND I DID IT. BOO HOO. SEOND SET MORE CAREFUL 100%. I HAVE SEVERAL ROBOT CARS AND THESE GIVE ME SOME EXTRA FUNCTIONS.

I have tried several of the cheap 433mhz Rx/Tx products. These devices not only worked as advertised but exceeded my expectations. The claims of difficulty getting reliable operations are completely wrong. Just follow the instructions. The device does more than simple OOK transmission it includes a 4bit incoder/decoder to send control signals.

Easy to program. Stuck a 17cm 24awg wire on the Tx and was able to get +60' feet around the house. Better quality than the other 433mhz modules.

a un premier essaie sa fonctionne mais lorsque réutilise le module 1mois plus tard (non fonctionnel) essaie les autre,probleme intermitent. plus capable de faire d'apprentissage sur les 3 modules donc tres peu utile