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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@allObjects
@Drumline18,
most likely you were already there: save() with modules where .connect() initializes device (such as RFID reader MFRC522), and here as well: RFID module RC522 interfaced to Pico results in various Uncaught Error MFRC522 Request Errors - latter mentions also some issue with the MFRC522 device...