5Pcs 433MHz RF Wireless Transmitter and Receiver Module Kit for ARM/MCU

Personally, I'm very happy with these. I realize there's some negative reviews regarding having to add the antenna but, honestly, the product pictures do not show an antenna. The cool thing is you can experiment with various wire thickness, and length of antennas on the transmitter. For example, I first used straight, insulated 22AWG jumper wire and just set the DuPont connector in the antenna hole without soldering it. I was able to get a 25' transmission distance. After soldering it, it increased to 40'. I replaced it and soldered a 26AWG conductor with 7 turns and was able to transmit to my neighbors yard through one wall at 100'. I think it's smart they DIDN'T include the antenna so the user can determine the range they need. But that's me!

These little guys always work. But so many reviews simply don’t realize they need to be tuned, as well as they need an antenna. 17.3 cm or a spring antenna. I get 30-75 feet with these and that’s going through a wall. Add some filters and you’ll likely get even more. Love them and have yet to have one that hasn’t worked (to varying degrees). And that’s saying something because I’ve ordered several. But I’ve gotten bad units from hc12’s, nrf24lo1, and other 433mhz modules. Not every project needs LoRa. These fit the bill, when you need an inexpensive solution.

Better off waiting a couple extra days for a better quality component from a different seller. These worked, but are so noisy I am not going to spend hours to days to tune them.

The transmitters were hardly putting out any RF; with a spectrum analyzer I could not get a reading unless the antenna was right next to the proper antenna soldered onto the transmitter. Per the schematic diagram, there should be a 3-turn inductor attached to but board above the 8-turn inductor. With this inductor missing, there cannot be any output to the antenna. I wound one on my own with some enameled wire (second photo shows the 'fix') and the transmitters worked as advertised. Shop around carefully, this particular product from this vendor is garbage!

These work well, but you should consider the set with the extra 4 pins on the reveiver since you can easily add an external antenna

Very disappointed with this order since I could not get any of these to work. I used tested sketches from RNT and Instructables. I tried with and without add-on antennas. Amazon is selling junk.

To people who have had problems with these not working at all, I have used a variety of these "FS1000A" modules (so labeled on the transmitter board), and here are some critical tips.1. The input terminals to the transmitter are labeled wrong. From left to right, looking at the top of the board, they should be DATA VCC GND. But they are mislabeled as VCC DATA GND. And in a cruel twist, if you connect it the way it is labeled (which is wrong), it will "kind-a" work, but the range will be terrible (i.e. at best you will get a few feet of range, and quite likely only a few inches!)2. Antennas are a MUST. Without an antenna, again, you may get no more than a few inches of reliable transmission, but perhaps up to 3-4 feet. You can use a simple piece of copper 22 ga wire, EXACTLY 17.3 cm long, for both the Tx and Rx (guage is not critical). If you are pushed for space, you can buy those little coil spring antennas that are offered for sale for these things, but the range won't be as good.3. Tuning. On some of these, the receiver is not tuned to the correct frequency, and you won't get ANY reception at all. There is a small tuning inductor on the receiver board (looks like a plastic green block with a screw in the middle of it). Try turning it counter clockwise in small increments with the transmitter only a few inches away, and see if you can them to work. If you go a whole turn in the counter clockwise direction and it doesn't work, turn it back to its original position, and then start trying it in incremental CLOCKWISE adjustments.When I finally figured this out (connections, antenna, and tuning), I can get at least 25-30 feet of solid 100% error free transmission, including through walls in my house.

I was unable to receive any data with rpi-rf after verifying the frequency was right with an RTL-SDR receiver