computoman

Wanted to be able to send music to speakers outside the house say for a barbecue or whatever. Could use Blue tooth among other things, but I wanted something more secure and easier to generally implement. PiFM seemed to be an answer . With a RPi you can send an old fashion radio signal to a radio and the radio will play what is sent it. All you need is an up to date Raspian install on a Raspberry Pi with internet access. I used the original  Raspberry pi for this project. I will probably set one up with the RPi zero. (Note: check you local laws to see if this is allowed.) Also you need to have experience using you RPi remotely. Antenna needs to be at least 7-14 inches long. You need to log into your Rpi command line. All this can be done easily. First thing is to get some software from the software repo for doing software development. Don't worry it will not hurt too bad. Update the system: $ sudo apt-get update $ sudo apt-get upgrade -y $ sudo apt-get dist-update -y...

Amazing the simple circuits that you can find on the internet. (am+fm) Metal detector: Audio transmitter based on same i.c. Analog:   Lidar: More coming.

Did you know you could build an intercom with homemade power. AM (amplitude modulated) radio makes it very easy to do.  To do am radios you need and audio source such as a microphone. We could transmit that signal but it might be hard to demodulate and the transmission signals would not be standardized so to speak. So you mix the audio signal with  a transmission signal. So that signal gets transmitted over the airwaves. So so good. What to we do to turn that signal back into something we can use? If we receive the signal as is the speaker will not play it as the signal cancels it self out. So we must divide the wave in half or demodulate it so to speak to make it useful. So we will use a rectifier or diode to do just that. The the signal becomes: Now the signal looks much more like the audio signal we first used to send in the beginning. More has to be done, but that is the gist of the conversion. Circuits: Transmitters: Receivers: Add a...

 Set up your own computer based radio. radio - locator .com is a good place to start for looking to find available stations. Many radio stations will let you listen to their live stream, Sometimes you can find and use the link on their web page. Sometimes you have to venture through web page html to find it the file and download it from their server. So if that file gets updated, you will need to get the file again. A play list might look like: $ cat klolfmaac.pls [playlist] File1=http://2243.live.streamtheworld.com:80/KLOLFMAAC_SC File2=http://2243.live.streamtheworld.com:3690/KLOLFMAAC_SC File3=http://2243.live.streamtheworld.com:443/KLOLFMAAC_SC Title1=KLOLFMAAC_SC Title2=KLOLFMAAC_SC-Bak Length1=-1 NumberOfEntries=3 Version=2 or $ cat koda-fm.m3u http://107.14.43.102:80/7/597/20097/v1/auth.akacast.akamaistream.net/koda-fm http://koda-fm.ng.akacast.akamaistream.net:80/7/597/20097/v1/auth.akacast.akamaistream.net/koda-fm http://koda-fm.ng.akacast...

Like to use my server as a stereo so to speak. Either can play sound files directly or can play music from the internet! For some reason the sound was not working on my system, so I decided to remove the pulse stuff and reinstall the alsa setup. This is the only method that I have found that works flawlessly: $ sudo killall pulseaudio $ sudo apt-get purge pulseaudio pulseaudio-utils gstreamer0.10-pulseaudio \  libpulse-browse0 paman pavumeter pavucontrol  $ sudo apt-get purge $ sudo mv /etc/asound.conf /etc/asound.conf-bak $ rm ~/.pulse-cookie $ rm -r ~/.pulse Reboot. Then install:   $ sudo apt-get install alsa-base alsa-tools alsa-tools-gui alsa-utils alsa-oss \  alsamixergui libalsaplayer0   Everything now works fine! In fact, sound is better than it ever has been.  Speakers seem to gently boom out the sound. Now you will want to install mplayer.  Most everyone knows how to use mplayer, if not use   $ sudo apt-get install mplay...

There is a new way of wifi networking that will allow you to have wireless nodes as a network backbone to replace a repeater network.The mesh networking has become popular in Austin, Texas and is spreading like wildfire. Another way people can become their own isp.  For example ,say you have several houses or homes that you want to connect. You will not have to run any cabling between the units. All you need is a router that can run the Hsmm-mesh (tm) firmware. The network is a variation on ham packet radio. The original intention was to have a free network where anyone can become a node. You can do a little specialization if you want it to be at least a little bit private via the ssid. Several homes or locations do not have to be next to each other, but the participating units have to have standard routers that have the hsmm-mesh software installed.  You can tie the routers together, by using traditional repeaters, but if the main router goes down, so does the network. ...