Construction of the Voice Shield

This Voice Shield project was created which is capable of playing audio sound bytes as it represents an analog audio shield for the Arduino.

The ISD4003 chip used to build the Voice Shield (VS) is known as voice chip since it was designed to record and playback messages for answering machines, talking cars, and other devices. 4 minutes of audio with sampling rate of 8kHz can be held by this version of the ISD although others can hold longer recordings but lower sampling rate. The VS contains an onboard 3V regulator with filtering capacitors and level shifting circuitry for safely connecting both the ISD which runs at 3V and the Arduino which runs at 5V.

With the VS, two forms of audio output are possible where one is a simple onboard audio AMP and speaker connectors with space for a 15mm speaker and the other is a none amplified line out with a 3.5mm stereo jack. The VS can blend two channel through a set of coupling capacitors into a MONO signal although the VS is a MONO device. The VS sounds better than most typical robots due to a recorded human voice.

Rest of the project