AltSoftSerial Library, for an extra serial port
The "Unusable PWM" pins can be used normally, with digitalRead() or digitalWrite(), but their PWM function controlled by analogWrite() will not work properly, because AltSoftSerial uses the timer which controls that pin's PWM feature. Yet another alternate software serial exists for only Arduino Uno, using timer2 and pins 3 and 4. It appears to only work with the ATMEGA328 chip on Uno. Basic Usage
Arduino ã®I2Cã‚’UARTã«å¤‰æ› - Qiita
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