HiLetgo 5pcs 433MHz RF Wireless Transmitter and Receiver Module Link Kit for Arduino/Arm/McU/Raspberry pi/Wireless DIY

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.).

it was ok

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.

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.

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