Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)

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By beic
btidey wrote:If you wanted to use i2c it mIght be worth trying the brzo i2c library.

You have to use external pull up resistors with i2c. Internal pull ups on esp are not low enough value.

Thank you, I already saw that a few days ago, but for that I need more brain power to write a custom library for the PN532 chip.