HiLetgo 5 Sets 433M Transmitter + Receiver Kit High Frequency Super Regenerative Transceiver Module for Burglar Alarm

It seems like these things have a high failure rate from the many different reviews with duds. I managed to Receive and Send with the first pair I picked out of the bag. Did not try the other 4 pairs. No noise from either module, range utilized for receive was about a foot and the range tested for send was 12 feet. Since this is already in working condition, I will not test further ranges.

They don't include an antenna, but it's easy enough to make your own out of a17.3mm long piece of wire. The first pair I tried worked very well as soon as the antenna was soldered on. I haven't done a range test yet, but they've gone through several walls in my house. I ran an all night test repeatedly sending transmissions and it was still working when I woke up. Hiletgo seems to be one of the better sellers of this type of stuff.

Did it work? Yes. Did it work as good as I wanted it to? Absolutely not. I could only get about 3 inch range even with using antennas on transmitter and receiver. Even then it was very intermittent when the signal would reliably be sent/received. If you think these will just work at a long range - move along. Without an antenna they would not work at all. Some reviews and online videos claim you can get a few centimeters without an antenna, but I could not get them working at all with no antenna. I read some reviews that say they are missing a 2nd coil. And mine too did not have this 2nd coil. But other online sites say it is not needed and another part takes its place. I don't know enough about them to know if that is true, but if there was a revision you would think they take the time to fix the silk screen lettering issues !!! These modules are different when visually comparing to online videos that show how they work. The 2nd coil is not there on the transmitter. And on the receiver a lot of the videos show a large resistor on the board, and mine did not have the resistor. Also one commenter pointed out it is missing a capacitor...mine also did not have the capacitor. I soldered one in, but did not do my test with antenna but without the capacitor soldered in so I can not confirm if that is required or not.

At first I was pretty worried about these components as I saw conflicting information about them both on this review page and across the web. For the transmitter the component itself is missing one of the coils that you usually see on the device which had me concerned it wouldn't run at all but that wasn't the case. I was able to trigger the device from across the room at least 12 feet or so which was fine for my purposes. I'm not sure how the missing coil lowers capabilities here if it lowers maximum range or the like but for short range use it's not a problem. I used my flipper zero to capture the signal for my device, then took out its micro SD card, found the file for the transmission, and converted it to a form I could use with Arduino. At some point I'll see if I can source one of the missing coil sizes and solder it in to see if it makes a difference. I haven't used the receiver boards as well as my use case didn't require them so I can't speak to the range there outside of the need for an antenna to be soldered in given the exposed pin for it on the device itself.

The receivers have an AGC so unless the transmitter constantly changes, they'll just output noise. The AGC imposes a minimum data rate of 100 bits/sec. Only in a few random cases will the receiver appear to show some correlation with a DC signal. Hi on the transmitter shows as high on the receiver. Low on the transmitter shows as low on the receiver. There's no analog output. They instantly turn on so they're better for remote controls than an SPI radio which needs a bunch of commands. There's no way to change the transmitter frequency. They don't come with antennas. You have to solder on antennas. Sadly, couldn't get any useful range using any voltage or antenna combination. They might be able to transmit a single code for an on/off signal or massively error corrected data at a very low rate below 1kbit/sec but the AM system just wasn't robust enough to send a unique code at 2kbit/sec.

I know this device got a lot of negative reviews, but I think the reason is most folks buying these don’t know what it’s used for or how to use them. I’m an amateur radio operator, and was able to attach a 17.3cm wire bunsoldiering itnto the tiny hole labeled ANT for antenna. I could pick up data transmissions from these modules well over 200 ft. I’m using these as a model rocket homing beacon. Using my RF analyzer, software defined radio, and frequency counter, I found that my units were actually transmitting on 434.050 MHz or 434.0100. So your units may have worked, but we’re not on the frequency you expected (433.92Mhz). If you don’t have a frequency counter, you can use a radio scanner to tune up and down the 433 MHz band to detect a transmission from your module. Also, the DATA pin is spelled backwards (ATAD) on the main board. Aside from that, I was able to get mine to transmit my call sign every few seconds with an Arduino Nano in Morse code and/or data, using it as a model rocket locator beacon. These also transmit in the AM mode. I was very happy with my purchase!

I was able to get these working with my esp32 quickly, but found the range of both the receiver and transmitter to be TERRIBLE. From comparing it to other spec modules, they’re missing a coil on the transmitter and possibly a capacitor on the receiver. To receive a remote code, the remote has to be right next to the receiver. To transmit, it has to be within a foot. Nothing like the expected 2m even without an antenna. Why cheap out so much on the components to where it’s near practically unusable. Going to try bumping voltage up to 12V on the transmitter to see if that helps.

it was ok

These RF Tx/Rx are complete junk. Even with the proper length of wire for the attenae it was way less than the advertise distance/performance. Max distance was about 5' from each other. Not sure how the other review stated they got over 200' of distance where the majority of reviews got way less. The chips were soldered so poorly that the resin and solder splashe were everywhere and pins were sticking out by 3-4mm on the backside. Seller was quick to response, but did nto provide any other usefull info other than diagrams of the pin-outs.

Receiver range is less than 1 meter at -10C. Cheap but you get what you pay for. No instructions whatsoever and conflicting information on the internet. Seller was on no help.

I gave a star for each unit that worked (3/6)!