generating a buzzer using microcontroller

I have- a- ------timer in my college.now -I want to generate sound on that- timer using a pic microcontroller by generating delays.such that i create one delay for one lecture.as soon as lecture finishes the buzzer should ring.it should generate even long delays that is a big soung should generatebefore and after a lunch break and even for tea break.can i do it.which pic microcontroller should i use.answer soon.

are we indirectly generating alarms using microcontrollerss.is this an alarm project.

Yes with a real time clock as an external interrupt is you answer

The buzzing sound you can achieve with pwm out on a dedicated pwm channel
See this example to see how this is done using
I’ve used the internal timer interrupts but for accuracy use a external real time clock

http://www.eeweb.com/project/mark_harrington/10-minute-uv-dental-tooth-whitener-timer

For the code click here written in C

http://s.eeweb.com/members/mark_harrington/projects/2011/11/28/dental-1322513304.c

Or if you want to step up from this use RPi and an internal database with a time server running in the background then you can network your alarm bells together you lessons being stored in a database or a simple text database

Use JDBC to achieve your objective and the java.util.Timer class to schedule an event i.e time for alarm to ring

Or if for example you wanted different allarms with days months spreading you could using the java.util.Date class then simple calle the getTime method or getDay method or getMonth


Which might for example store name of class, start time, finish time compare with internal clock you can do anything with this my friend then each RPi sitting in the class listening to wifi calls so that the alarm can sound across tcp/ip

You could even transfere your voice across the netork VOIP for example so there your intercom sorted out

Blimey fancy that that makes life more exciting , no more wires

Lets take this a stage further youve got gpio pins on the Rpi what about a firealarm at the same time automatic individual class security Alarms for when they lock up at night Crikey !! I mean thats clever huh

Forward thinking my friend , "Bit of hard work thats all !" Got to be worth it hasent it better than wasting your time doing nothing What do your reckon on that one then

Or you could transfere this messageing on alarm for example raising an event in your class which would put out an RS-485 message to each recieving pic micro maybe instead using one rpi (raspberry pi module )

What cant you do with this is more the question

Shall we attch this to solor power as well with battery backup hmm yum yum