make a raspberrypi respond to a button
In talk to an API we used a script to record voice input and send it out to Google’s speech to text API.
We used the command line to control that script, and we set it to loop infinitely. so let’s update it to use a button. Push to talk.
First we’ll edit the shell script, then we’ll make a python script to listen for the button, and launch the shell script.
edit the shell script
We want to take out the stuff about looping. We’re left with the following:
#DaveConroy.com
#10/29/13
#stt.sh
#modified by Andrew Monks
mkdir -p stt-output
echo "Recording your Speech ($time seconds)"
arecord -D plughw:0,0 -f cd -t wav -d 0 -q -r 16000 stt-output/stt-recording-$i.wav &
PID=$!
#set duration of recording
sleep 5s
kill $PID
echo "End recording"
sleep 1s
echo "Converting speech to FLAC"
flac -5 -s -f --best --sample-rate 16000 -o stt-output/stt-recording-$i.flac stt-output/stt-recording-$i.wav
echo "Converting Speech to Text..."
wget -q -U "Mozilla/5.0" --post-file stt-output/stt-recording-$i.flac --header "Content-Type: audio/x-flac; rate=16000" -O - "http://www.google.com/speech-api/v1/recognize?lang=en-us&client=chromium" | cut -d\" -f12 > stt-output/stt-text-$i.txt
echo "You Said:"
value=`cat stt-output/stt-text-$i.txt`
echo "$value"
echo "put to server"
url="http://gentle-inlet-8461.herokuapp.com/newtext/$value"
echo "$url"
wget -qO- "$url" &> /dev/null
Trigger the shell script
Here’s a simple python script to listen for a button on GPIO pin 23
#!/usr/bin/env python
from time import sleep
import os
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.IN)
while True:
if ( GPIO.input(23) == False ):
os.system('./stt.sh &')
sleep(0.1);
It requires RPi.GPIO, which comes preinstalled on Adafruit’s Occidentalis distro, or which you can easily install with:
sudo apt-get update
sudo apt-get install python-dev
sudo apt-get install python-rpi.gpio
button hardware
