Rei Vilo 695 Posted October 17, 2017 Share Posted October 17, 2017 The DS1307 operates at 5V. See the data-sheet at https://datasheets.maximintegrated.com/en/ds/DS1307.pdf. So you need a logic level translator. See for example http://embeddedcomputing.weebly.com/isup2c-logic-level-converter.html. Quote Link to post Share on other sites
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