Post by thread:[PICLIST] [EE] what is the simplest way to detect

Greetings, what is the simplest way to detect a blown bulb ? maybe the indication is an LED lit up ?? regards, ckchan -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:" PIC only "[EE]:" engineering "[OT]:" off topic "[AD]:" ad's

an easy way to detect this kind of problem is to put a neon across the switch that turns it on (on a mains environment) or yes, an LED (and series R) in a low voltage, DC one. I regulatly use a neon across a switch and a neon across a fuse on dimmers - this shows that the lamp is ok (this goes out when you turn the light on, but the light is on, so you can see it working :-) and the neon across the fuse helps by showing when the fuse blows (but only when a lamp is fitted) If you really want to, adding a resistor to the fused live to neutral means the neon will show blown fuse even with a blown bulb in curcuit. Kevin {Original Message removed}

At 09:30 PM 9/29/00 +0800, you wrote: >Greetings, > > >what is the simplest way to detect a blown bulb ? maybe the indication >is an LED lit up ?? Is it a mains powered lamp or, say, an automotive lamp? How is it being driven? Best regards, =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Spehro Pefhany --"it's the network..." "The Journey is the reward" spam_OUTspeffTakeThisOuTinterlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:" PIC only "[EE]:" engineering "[OT]:" off topic "[AD]:" ad's

>what is the simplest way to detect a blown bulb ? maybe the indication >is an LED lit up ?? Euhhh? Lights are out? .... :o) Jilles -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:" PIC only "[EE]:" engineering "[OT]:" off topic "[AD]:" ad's

Greetings, > >what is the simplest way to detect a blown bulb ? maybe the indication > >is an LED lit up ?? > > Is it a mains powered lamp or, say, an automotive lamp? How is it > being driven? well, it will be 12V dc bulb, operate when the switch turn on. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:" PIC only "[EE]:" engineering "[OT]:" off topic "[AD]:" ad's

"simple" is a tough term. What other circuitry are you using that we might be able to steal in to? (i.e. are you using a microcontroller with a free i/o port). The simple things are to detect the presence of light, heat, voltage drop or current flow. What other circuitry you are using might clue in as to which way to go. {Original Message removed}

How about a button connected to your PIC labelled 'Press if bulb does not work' :-) -----Original Message----- From: pic microcontroller discussion list [.....PICLISTKILLspam@spam@MITVMA.MIT.EDU]On Behalf Of ckchan Sent: 29 September 2000 16:27 To: PICLISTKILLspamMITVMA.MIT.EDU Subject: Re: [EE] what is the simplest way to detect a blown bulb ? Greetings, > >what is the simplest way to detect a blown bulb ? maybe the indication > >is an LED lit up ?? > > Is it a mains powered lamp or, say, an automotive lamp? How is it > being driven? well, it will be 12V dc bulb, operate when the switch turn on. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: "[PIC]:" PIC only "[EE]:" engineering "[OT]:" off topic "[AD]:" ad's -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Hello! The simplest way (it seems so) is to check for example full voltage on the switched off bulb! ^+V | O bulb | check--^^R^^--+--o \-----gnd Thanks, Vladimir {Quote hidden}> an easy way to detect this kind of problem is to put a neon across the > switch that turns it on (on a mains environment) or yes, an LED (and series > R) in a low voltage, DC one. > > I regulatly use a neon across a switch and a neon across a fuse on dimmers - > this shows that the lamp is ok (this goes out when you turn the light on, > but the light is on, so you can see it working :-) and the neon across the > fuse helps by showing when the fuse blows (but only when a lamp is fitted) > > If you really want to, adding a resistor to the fused live to neutral means > the neon will show blown fuse even with a blown bulb in curcuit. > > Kevin > > {Original Message removed}