A feature-rich Arduino Waveform generator

When it is worth doing, it is worth overdoing. Based on an idea from Instructables.com, but better, shinier and with more features.

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Description

This is my arduino-based waveform generator using a 8-bit resistor ladder DAC. It runs with a sampling rate of 65536 Hz and can create any (whole-number) frequency from 1 Hz to 30ish KHz in sine-wave, sawtooth, triangle and different ratios of square wave.

My generator produces an amplified signal and also a unamplified, high-quality signal. There is a LCD built in that shows the current frequency, and also a speaker. The LCD is actually a hacked cheap pocket calculator, for which i found out how to press CE, +, = and 1 with the arduino to make the LCD show a specific number. Yes I know that this is a stupid hack :). The generator runs from a 9V battery. Two videos are shown below; one for the hacked calculator display and one for the generator itself.

The Arduino software and some other files are linked below, the electronics are pretty much the same as on instructables.com/id/Arduino-Waveform

Details

The Hacked calculator as LCD:The sound generator in Action:

Files

cheapoPocketCalcDisplayLive.h The Arduino-Library to use a pocket-calculator as LCD. Header-file. x-chdr - 1.65 kB - 07/19/2016 at 19:00		Download
cheapoPocketCalcDisplayLive.cpp The Arduino-Library to use a pocket-calculator as LCD. Main .cpp. x-c++src - 6.08 kB - 07/19/2016 at 18:59		Download
sound_generator_440Hz.ino A kastrated test-version of the sound_generator file that will play a 440 Hz sine-wave on an arduino without pots connected. For testing the R-ladder-DAC x-arduino - 73.91 kB - 07/19/2016 at 18:58		Download
sound_generator.ino The current sound-generator firmware as described and shown in the video x-arduino - 78.95 kB - 07/19/2016 at 18:58		Download

Components

1 × 4mm Plywood
1 × Arduino UNO
4 × 10Kohm, linear mono potentiomenter attached to the analog inputs of the arduino
2 × 47Kohm logarithmic mono potentiomenter Line volume and speaker volume
2 × Mini switch Display on/of, device on/off

View all 11 components

Discussions

cammhifi wrote 03/13/2022 at 16:03

Hi, do you have a version of code using a 2 x 16 LCD display?

Are you sure? yes | no

masterscience.jl wrote 01/16/2022 at 08:45

the calculator hack is definetly brilliant and is easily obtainable..." kudos for that sir"

so brilliant in fact i signed up just so i could say so.

Are you sure? yes | no

rjca.ve61 wrote 10/31/2017 at 18:03

Greetings, you could send me the program for this project?

Are you sure? yes | no

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A feature-rich Arduino Waveform generator

Description

Details

Files

cheapoPocketCalcDisplayLive.h

cheapoPocketCalcDisplayLive.cpp

sound_generator_440Hz.ino

sound_generator.ino

Components

Discussions

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A feature-rich Arduino Waveform generator

Become a Hackaday.io member

Just one more thing

Description

Details

Files

cheapoPocketCalcDisplayLive.h

cheapoPocketCalcDisplayLive.cpp

sound_generator_440Hz.ino

sound_generator.ino

Components

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Discussions

Become a Hackaday.io Member

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