HiLetgo5 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.

All of the parts I received in (in the same box) are different. No two of them have the same value components in all positions. Most of them had blatant soldering defects, including tombstoning and not connected joints. However, they all have one thing in common. None of them work without adding in some missing parts. They are all missing a critical component (capacitor) on the receiver board. (I circled the missing component on the attached image.) This is the only possible signal path between the preamplifier and the rest or the RF chain. If you look at the image of the parts in the ad, you will clearly see that there is a capacitor in the location I marked. I added a 100pf capacitor in the marked location on a test board, and after some tuning and tweaking, I was able to make it work. (Once working, it seems to be good enough in a low noise environment. However the basic design is flawed in that it is much more prone to noise than could be done with the same amount of parts otherwise.) So unless you want a fix-it project, these are a waste of time.

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!

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.

Todos los receptores buenos (5/5), un sólo emisor malo (1/5). Los probé con la librería TinyRF, específicamente, "TinyRF_TX.h" y "TinyRF_RX.h", para los sketchs de transmisión y recepción respecivamente. Usé una placa arduino uno para el receptor, puesto que la placa de desarrollo mh-et live attiny88 carece de comunicación serial para el serial monitor del ide arduino.

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.

This was the third RF RX/TX that I tried. I'm using the Radiohead RH_ASK library which claims compatibility with most of the "inexpensive" 433 Mhz devices available ... there are several different manufacturers and types. This one actually worked as described in all the YouTube videos with the latest RH_ASK library with Arduino UNO (R3) and Pro Mini. Of all the YouTube videos out there on this subject, I noticed the best and most informative ones use this type - FS1000A Tx & 080408 Rx. I'm not saying the others (e.g. SYN115/480) - I just didn't have much luck with them.

Love these little guys work great for anything at few meters lengthy you can stretch that length out to 10’s of meters with the right antenna and power supply. Add filters (ferrite bead and capacitor). Also you can pull down the data pin with about a 10k resistor. They work awesome. Love them for simple projects .((((EDIT:)))) Some people don’t understand that these need antennas and that they need to be tuned. They have to be dialed in with the pot in the little green box. I get them all to work at 25/100ft. (Maybe farther for some but I run out of yard.).