DTFM Detector

Overview

The device captures input from the microphone and decodes digit encoded using DTFM.

Schematic

Connections

Display to Arduino

Display	Arduino
VCC	5V
GND	GND
DIN	D11
CLK	D13
CS	D9

Mic to Arduino

Mic	Arduino
VCC	3.3V
GND	GND
Out	A0

Note: Connect 3.3V to AREF

Video

How to build

Run gradlew fatJar from processing folder

Capturing serial output to file

1. script -a -t0 serial.txt
2. screen -L /dev/tty.usbXXXXX <bauds>
3. Stop screen: Ctrl+A + Ctrl+K
4. Stop script: Ctrl+D

References

• DTFM tone generator

• http://www.hex705.com/logging-serial-communication-to-a-text-file-arduino-and-osx/

• Goertzel algorithm description

• https://xantorohara.github.io/led-matrix-editor

• habr