01-18-2020
This is my last update / post on this Arduino Tick Tock shield for now. I was going to post the details on how to calibrate the thermistor; including taking various measurements, recording the resistance at various temperatures, setting up the Steinhart-Hart Equation and solving it with matrix math, but I'm going to put that off for now.
Basically, this shield is a nice learning tool, with the real-time clock, thermistor, light sensor, display, buttons and LEDs to play with; but the RTC, the light sensor and the thermistor are of such low quality, that it's not really useful for anything more than "a toy shield" for learning and playing around.
The Ardunio Tick-Tock DS1307 RTC Shield was "fun" but not sure I recommend it to anyone, even for under $5 USD.
But on-the-other-hand, I did get my $5 worth playing with it so, as always, YMMV.
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CDPLAY(1) General Commands Manual CDPLAY(1)
NAME
cdplay - play audio compact disks
SYNOPSIS
cdplay [ -a]|[-r]
DESCRIPTION
Cdplay is an audio-cdplayer it can be used interactively or non-interactively. With no flags cdplay is used interactively. When used inter-
actively cdplay can be either in non-playing or playing mode. In non-playing mode you can select tracks to be played. In playing mode
cdplay shows the track-time, remaining track-time, total-time and remaining total-time. Cdplay assumes the drive to be at /dev/cd0.
During non-playing mode the following commands are available:
cursor-up/down
browse through the track-list
spacebar
add track to the play-list
backspace
remove a track from the play-list
s start playing the tracks in the play-list. When the play-list is empty start playing from the current position in the track-list
until the end of the cd
p play the track on the current position in the track-list
r play all tracks in a random order (shuffle play)
e exit cdplay
During playing mode the following commands are available:
s stop playing, return to non-playing mode
spacebar
pause/resume current track
cursor-up/down
skip to next/previous track
OPTIONS
When one of these options is used cdplay does everything in the background.
-a Play all tracks, cdplay tells the drive to play all tracks and then it immediately returns to the user
-r Play all tracks in random order (shuffle play). Cdplay forks of a new process which starts up a track, during that track it sleeps.
When the track is finished it wakes up to start the next track and goes to sleep again. The parent process immediately returns to
the user.
BUGS
Cdplay does not sense if a cd has changed, so don't switch cd's. If you want to play another cd you have to insert the new cd and start
cdplay again.
AUTHOR
Michel R. Prevenier (mrpreve@cs.vu.nl)
CDPLAY(1)