2pcs Wireless Module NRF24L01+PA+LNA in Antistatic Foam Arduino Compatible with Antenna

I have 2 types: the nrf24l01+ with antenna and the AS01-ML01 Quick test, they work as advertised. I did a small range test in the house, did not get any drop outs (i estimate about 300 ft). I used 1 with antenna and 1 with PCB antenna and already got improved range. I also tested a set with regular PCB board-antenna and they drop at the far end of the house, so this is an improvement in range. I also tried to get them really very close to each other without issues. They have the same standard (8 pin) connections so if you use headers you can simply swap them out HOWEVER... i have some strange experiences with the external antenna ones vs. the pcb antenna: i have several circuits and build a simple receiver and transmitter for testing these modules. I found that the PCB ones always work, the ones with antenna are trickier. They work fine in some circuits and not in others. Sometimes they only work when i touch the antenna or some of the pins with my hands and i have not figured out why it works fine in one cricuit and not in another. I think it's important to keep the (SPI) connections as short as possible, i also use a capacitor over gnd/Vcc (i tried moving from 100nF to 10uF but no change in behavior). In my case the antenna did not work when it points up 90 degrees (the obvious first one to try) but works great at some other angles. So all in all a bit finicky. Update: some people report better reliability if the module is housed in a metal case or even foil. Just be careful about short circuit

Funcionan sin problemas, ambos modulos vienen con su respectiva antena

Plugged 'em in and they fired right up. No issues, no fuss. good product. The antennae are nice and tight so they stay in the position you 'twist' and 'bend' them into.

I havent tested these in the rain yet (little rain where I live) but so far the radios work well I had a little bit of a hard time getting them up and running. This is mainly due to I did no know if I had a known good working radio, or had a wiring problem (easily checked) or a software issue. But after doing a bit of research and testing I have had them working fine on and Arudino Mega, and Arduino Nano and a Raspberry Pi. Now that I have a known good pair adding radios should be easy.

UPDATE: Device may have issues with temperature stability. Used in greenhouse remote controller, I found that when temps in my greenhouse dropped the communications link stopped working. It started working again when the temperature warmed up. I don't have a full engineering lab to test the frequency stability over temp, but my guess is the reference oscillator isn't well temp compensated. ORIGINAL: Received the units quickly and were packaged in protective anti-static bags inside the box. Connected to Arduino Uno R3 and used existing Arduino available libraries for drivers. Used an example program provided in Arduino library and both units were transmitting and receiving on my second attempt - the first attempt had errors due to overdriving the receiver simply had the transmit power too high for units slow close on a desk - turn power to minimum in the code and it worked perfectly. Wrote a sketch (program) to communicate back and forth between two units with text just to try it out. Saw some complaints from other reviewers about not working or communication being error prone - not the case for me at all. I just made sure that each radio was separated a few inches from the Arduino control unit (to avoid radiated noise into both transmitter and receiver) and that the Transmit power was at minimum when units are in close proximity (to avoid over-driving the other unit's receiver). I am using them with the 3.3V breakout boards also available on Amazon since they are high transmit power capable and have not had to add any capacitors to reduce noise on the power supply lines line some people mentioned as being required in some Arduino forums. The library also features the ability to turn on CRC error detection or you can add some yourself...there are ACKs and all sorts of features for enhancing the reliability of the communication. Good luck!