Comment on ESP32 Wemos D1 Mini – Sprinkler Controller Open SourceparentComments−151552yNXP and STM make NFC<->I2C EEPROM chips that are <$1 which can easily be used to transmit data from a mobile device directly into the target.https://www.nxp.com/products/rfid-nfc/nfc-hf/connected-nfc-t...https://www.st.com/en/nfc/st25dv-i2c-series-dynamic-nfc-tags...
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NXP and STM make NFC<->I2C EEPROM chips that are <$1 which can easily be used to transmit data from a mobile device directly into the target.
https://www.nxp.com/products/rfid-nfc/nfc-hf/connected-nfc-t...
https://www.st.com/en/nfc/st25dv-i2c-series-dynamic-nfc-tags...