5
votes
Accepted
What is the difference between ISO/IEC 14443 and ISO 7816 smart cards
The original answer is correct, but it lacks details.
ISO14443 is a contactless protocol (cards with an antenna embedded). It specifies only the lower-level of the communication protocol (what ...
- 16k
1
vote
LEDs on 3.3V serial and sd card select lines
Try this:
R1 has been sized assuming a typical green LED with 2.1 V drop and 10 mA of LED current when the digital signal is low.
When the digital signal is high (at 3.3 V), there will be about 1 V ...
- 313k
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