Beth has a nack for make her own RFID cards. This time she has made one on a duct tape substrate, she says is indistinguishable for a manufactured RFID card distance wise.
I would check out her blog as this is an awesome way to quickly experiment with RFID.
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Python for Microcontrollers – Adafruit Daily — Python on Microcontrollers Newsletter: A New Arduino MicroPython Package Manager, How-Tos and Much More! #CircuitPython #Python #micropython @ThePSF @Raspberry_Pi
EYE on NPI – Adafruit Daily — EYE on NPI Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey