QIACHIP3 Sets of 433mhz RF Transmitter and Receiver Module Wireless 4 Channel Output Link Kit Set with 1527 Learning Code for Remote Control

These are pretty nice little boards, they came already paired but seem easy enough to re-pair and can even be paired to other generic 433mhz transmitters. With the antennas on they seem to have a pretty good range too.

Works good

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 -> D0VT: 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 seconds2) 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 OFFNOTE(*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 touchyOverall, 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.

These units work well and are easy to program. I connected them up with a 5V power supply and tested each mode.The headers soldered to the transmitter are shorter than the receiver and will not stay in a breadboard. They are long enough to be soldered into a PCB. I had to straighten them with a pair of pliers to use it on a breadboard.Another observation is that K 1-4 on the transmitter are not mapped directly to D 0-3 on the receiver. This is not a big since the pin numbering is arbitrary. Just be sure to know how the transmitter pins and receiver pins are associated when building a circuit.The attached video demonstrates how each mode operates.