아니 그 사실 이전 글에서 5v 잘된다고 큰소리치긴 했지만 자꾸 뭔가 신경쓰여서... 3.3v 전압분배기 하나 만드려구용.... https://electronics.stackexchange.com/questions/186168/how-to-convert-uart-voltage-from-5v-to-3-3v how to convert UART voltage from 5v to 3.3v? I have PIC18F4455 connected to spark core wifi chip. I send data from PIC18F4455 to the spark core by using UART. The problem is the output data of pic18f4455 equals to 5v, and the s..