Use a relay driver IC like ULN2003 to drive relay. Here is a sample circuit diagram : https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcRHlj1CguFmSQrc78-Aqq8KwK-TueR7ydrpyNWIgQn6sfLymKBIX3rfuEvH
B45i
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