Pesky phone always ringing at just the wrong time? Worried about your phone transmitting data even when it’s off? Make a simple cell phone sleeve from conductive fabric to block RF transmissions.
Not all conductive fabrics block the same frequencies of RF or at the same effectiveness. We found the shiny knit silver plated fabric in the Adafruit shop to be the most effective across wifi and cellular ranges, based on anecdotal testing with various phones.
Layering different types of conductive fabric may yield better frequency coverage, much like having multiple active ingredients in sunscreen. LessEMF does frequency blocking tests on their textiles and reports a graph of their shielding performance– our silver stretch is similar to theirs.
In our tests we also tried this pouch with NFC/RFID, and it did not block the phone from scanning a tag, nor did it stop an RFID entry tag from unlocking its door.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.