QIACHIP 433mhz RF Wireless Transmitter and Receiver Module Kit RX480e 4 Channel Output,Remote Control Radio Switch 1527 Learning Code DIY Controller

Havent tested range yet but very good and consistent at short range

Simple set up.

I spent several hours trying to sync each channel with my Sonoff rf bridge. Channels 1&2 seemed to be linked together, they both triggered the same message. 3&4 were fine. Upon close examination under a bright light I could see a tiny glint of copper between pins 1&2. A bit of cautious scraping to remove the tiny short and the tax now functions correctly. Additional note- the transmitter supply voltage is from 3.3V to 24V. (Apparently the higher voltage of within these levels the greater the range that can be achieved.) I have proved the transmitter workers up to 13.5V with only the above problem. BUT Beware. The receiver operates at 5V max. I have not tested the other two pairs yet, but apart from the above and some difficulty setting the correct modes for the receiver (which I will probably not use for this project) I am hopeful all will be well. I am also pleased that the transmitter does work with the Sonoff RF Bridge. The only way for me to discover this was to buy these and test it out. So to anyone else wanting to interface with the Sonoff RF bridge it can be done. It’s a bit tricky to set up though. Hint, add each channel as an alarm in the Sonoff App, then rename it what you will.

We use them for door access

I note there are multiple reviews but no one has mentioned a couple of problems and gotchas with these devices and only one person I’ve seen mentioned the power supply catch which, could conceivably result in this going to silicone heaven. The range is entirely dependent on the power supplied to the transmitted and ONLY the transmitter. The receiver requires 5V and lacks a voltage regulator and should therefore be powered from either an LDO module or even from the 5V LDO output on the Arduinos. Unless you’re driving lots of LEDs or some other devices the meager receiver consumption should not be an issue. I’ve even driven it from a digital pin, which is normally rated to 20 mA with a 40 mA max on the AtMega 328p as fitted to the Arduino Uno and Nano. With this in mind, powering these modules isn’t difficult and they both have a very low standby current, with the majority of consumption during the communication phase as might be expected. Pairing them is easy but the lack of clear instructions is a gotcha – so bad that it caught me out and has done other customers. It seems obvious to me now, but the receiver won’t enter pairing mode if it’s receiving a signal on the same band. This really should be made clear in the instructions because there are no warnings that this (entirely expected) interference could cause the manual pairing to fail. The process is: 1) Remove power to the transmitter. 2) Connect power to the receiver. 3) Press the pairing key eight times in quick succession. 4) Supply power to the transmitter. This will result in the receiver flashing to confirm it’s now paired. 5) Press the pairing button once, twice, or three times depending on what “mode” the receiver is going to operate in. Hopefully this will help someone else. Another thing that wasn’t clear from any instructions I was able to find was how to operate these devices with an Arduino although there probably are some blogs. For new owners, it’s worth noting that the VT pin goes high when there is data present at the four digital pins. This allows a program to constantly poll (or use an interrupt) to read only read the four digital pins only when they contain either valid data or a new command. The down side of these devices is the very low speed. I can’t time it exactly, but there appears to be a delay of around 0.5 seconds between putting new data on the transmitter and that data appearing on the four output lines (giving 16 possible codes per “packet”). For many cases this is probably fine but in my particular application it’s simply far to long as we needed something more like real-time (measured in a few 10s of microseconds).

All working well

Great little product and great value. However the inputs on the transmitter don’t match the outputs on the receiver. It doesn’t mention this in any documents I could find. Also the transmitter runs from 3-12V, but the receiver is 5V only! I smoked one attaching it to 9V!!!

Very Poor Quality! the first Transmitter module failed within two hours draining the battery. The Second Transmitter would only send channels 1 and 2. The third transmitter module appears ok ( but its only been a day so far) so a 30% success rate. These modules are cheap and I suppose you get what you pay for!