README.md
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TTS

Text-to-Speech Library for Arduino


checkout this project into your sketchbook/libraries folder
requires an amplifier on the PWM output pin (see below)
see <![CDATA[]]>blog articles<![CDATA[]]>


Supported Hardware


ATmega328-based Arduinos (e.g., Uno, Pro, Pro Mini, etc.): pins 3, 9, 10
<![CDATA[]]>ArduTouch<![CDATA[]]>: pin 9
ATmega1280-based Arduinos (e.g., Mega): pins 44, 45, 46
Arduino Leonardo: pin 5
Arduino Due: pins DAC0 or DAC1
Teensy 3.2: pin A14
Teensy 3.5, 3.6: pins A21, A22
Teensy LC: pin A12
ESP8266: pins 0 to 16 (with analogWrite())
ESP32: DAC1 or DAC2 (pins 25 or 26)


Amplifier



Component choices in this circuit aren't very critical:
- 22k (vs 27k) and 47n (vs 10n) parts in the input low-pass filter 
- 100n (vs 10u) bypass capacitor between pin 7 and gnd
- Used the inverting input instead of the non-inverting one (although in
  this circuit I noticed no difference)
- 47n (vs 100n) output snubber capacitor

Credits


original implementation by Clive Webster in <![CDATA[]]>Webbotlib<![CDATA[]]>
ported to Arduino by <![CDATA[]]>Gabriel Petrut<![CDATA[]]>
Stephen Crane modified it to use pins other than pin 10 with the help of <![CDATA[]]>this tutorial<![CDATA[]]>
<![CDATA[]]>manitou48<![CDATA[]]> added support for Leonardo
and ARM processors with DAC (Teensy, Due)


See Also


Teensy <![CDATA[]]>forum<![CDATA[]]>
separate port/hack for MBED ARM with DAC <![CDATA[]]>repository<![CDATA[]]>
Hackaday article on <![CDATA[]]>LM386 amplifiers<![CDATA[]]>