README.md
View this project on CADLAB.io.

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 ]]>blog articles]]>


Supported Hardware


ATmega328-based Arduinos (e.g., Uno, Pro, Pro Mini, etc.): pins 3, 9, 10
]]>ArduTouch]]>: 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 ]]>Webbotlib]]>
ported to Arduino by ]]>Gabriel Petrut]]>
Stephen Crane modified it to use pins other than pin 10 with the help of ]]>this tutorial]]>
]]>manitou48]]> added support for Leonardo
and ARM processors with DAC (Teensy, Due)


See Also


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