void setup() {

// initialize serial communication at 9600 bits per second:

Serial.begin(9600);

Serial1.begin(9600);

// set the word rate at 275 words per minute (can go 75 - 600 wpm):

Serial1.println("W275");

}

void loop() {

// read serial from the Serial Monitor:

if (Serial.available()) {

String input = Serial.readStringUntil('\n');

// print out the value you read to the Emic2:

Serial.println("S" + input);

Serial1.println("S" + input);

}

delay(500); // delay in between reads for voice legibility

}

The [Emic2](https://www.parallax.com/product/emic-2-text-to-speech-module/) is a text-to-speech generator with an asynchronous serial interface made by [Parallax](https://www.parallax.com/). Sadly, it seems to be mostly out of production now.

If you're working with an Arduino that has two hardware serial ports, such as any of the SAMD boards (MKR boards, Nano 33 IoT) or the 32U4 boards (Leonardo, Micro), then you can just attach the Emic2. If you're working with an Uno or another board with only one hardware serial port, you'll need the [SoftwareSerial](https://docs.arduino.cc/learn/built-in-libraries/software-serial) library. Paul Stoffregen maintains a [version of it](https://github.com/PaulStoffregen/SoftwareSerial).

To connect the Emic2 to any Arduino, the SOUT goes to the Arduino's RX and the SIN goes to the Arduino's TX. Although the Emic2 is rated to run at 5V, it runs fine on 3.3V as well. Figures 1 and 2 below show an Arduino Nano 33 IoT connected to an Emic2.