Radio Transceivers

AwesomeCronk

Hello, I am trying to find some radio transceivers. The requirements will be that I can send/receive data with a BS2 using SERIN/SEROUT(preferably on seperate Rx/Tx pins), power with 5v, and connect over 20+ ft. By the way, multiple channels would be great! Thank you all in advance!

AwesomeCronk

These channels could be controlled by a serial command or switches on the module.

Publison

https://www.parallax.com/catalog/wireless/xbeerf

AwesomeCronk

Thank you, Publison.

erco

Those Xbees are solid and bulletproof. I have used the vastly cheaper ($1) 433 Mhz Tx/Rx modules for one-way communication but those have serious quality control issues. One pair works from 60 feet away, the next pair can't go 2 feet. Bears further investigation when I get the time.

Where in the heck is Duane Degn? That guy had lots of good projects using the Nordic transceivers. Haven't tried them myself. https://www.aliexpress.com/item/NRF24L01-NRF24L01-Wireless-Module-2-4G-Wireless-Communication-Module-Upgrade-Module/32649820125.html

AwesomeCronk

I found this. Has anyone here used this before?
wiki.seeedstudio.com/433Mhz_RF_Link_Kit/

erco

That's the 433 cheapie link I mentioned. Very hit or miss. If you need one, order 5 and test. Only one way though, not duplex or the multiple channels you requested.

Unreliable and possibly illegal on that frequency. A win-win!

AwesomeCronk

Ookaayy, then. Any other ideas for close price range?

AwesomeCronk

Seen this before?
skycraftsurplus.com/nrf24l01antenna24ghzwirelesstransc.aspx?gclid=CjwKCAjwwuvWBRBZEiwALXqjw1kCtr6oImpOPwXhvbmqseURgjOABUgrfm9aUEYh4uMgpU98L3XFWRoC298QAvD_BwE

Jeff Haas

I found some code for the NRF24L01 on Basic Stamp:
https://forums.parallax.com/discussion/133053/nordic-nrf24l01-bs2-code-example

iseries

I would use the ESP8266 or Parallaxes WX module.

You can use them to connect to your network or just to another device. Plenty of Arduino examples out there for re-programming these devices to do what every you need done with WiFi.

The ESP8266 uses a modified AT command structure for setting up a connection or you can re-program it using Arduino to be a web server.

Digi-Key has the unit for about $7.00.

The parallax unit is a lot more money but it has the power supply on it to work with 3.3v or 5v and the pins work with the BS2.

In either case these units have been used to send data wireless for years now.

Mike

AwesomeCronk

iseries.
I have a Parallax ESP8266 and love it, but am trying to communicate between two stamps, and the ESP does not do that as far as I know.

Jeff Haas.
Thank you, I will look into this. Sounds Promising.

Thank you, both of you.

AwesomeCronk

Going to have to dissect the code for a little while. It's huge.

AwesomeCronk

Is this the same thing?
NRF24L01_at_AliExpress

AwesomeCronk

This will work, thank you all.

Ken Gracey

See this too http://akizukidenshi.com/download/ds/parallax/32440.pdf

The X-CTU screen shots and setup part is obsolete but the concepts and BS2 code are still functional.

Ken Gracey

AwesomeCronk

Thank you, Ken. If I cannot get this to work, then I want to use a wireless usb keyboard and have a system to be able to connect to a usb plug.

AwesomeCronk

Communication remains the only issue.

erco

As I mentioned previously, those cheap 433/315 Mhz modules are hit & miss, quality-wise. Nice if they work well, but usually not. I have several new ones I need to test. Here are some links about using them that I found interesting.

Test results: http://www.romanblack.com/RF/cheapRFmodules.htm

Antenna is critical: http://www.instructables.com/id/433-MHz-Coil-loaded-antenna

Picaxe buffer chip: http://www.picaxestore.com/en_gb_d/nkm2401.html http://www.picaxe.com/Hardware/Add-on-Modules/RF-Connect-Radio-Boards/

K2

erco wrote: »

As I mentioned previously, those cheap 433/315 Mhz modules are hit & miss, quality-wise. Nice if they work well, but usually not.

Like any hoarder worth his salt, I've had a supply of 433MHz modules for quite a while. A month ago I pulled out the Uniden scanner to get a better idea of what they were all about. The most startling revelation was that one of the local 70cm ham repeaters is transmitting smack dab in the middle of the passband of my 433 MHz superregenerative receivers (identical to those AwesomeCronk linked).

I think that out in the boondocks, practically any of the Tx units would work decently with practically any of the Rx units. But near The Big City, there are too many interfering RF sources for such simple receivers.

BTW, the receivers necessarily have to be broad because the SAW-based transmitter modules aren't terribly accurate. The whole system is really just a bit too cheap unless you live near Euell Gibbons.

AwesomeCronk

Hmm. I'll just have to get a wireless keyboard or something. Thanks!