Novices, please refer to @liujigang’s project https://oshwhub.com/liujigang/gong-jiao-men-jin-ka to simply draw a three-in-one access control card and select which card to use through the micro button.
The BOM table is incorrect, please refer to the engineering attachment!
The micro button uses KEY-SMD_4P-L5.2-W5.2-H1.5
Please do not use it for profit!
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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.
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