Just be careful - the designs in these toys are not robust or reliable, and may be triggered by something other than the transmitter. Consider putting a PIC on both ends (or even a rolling code setup) with a low data rate to secure the transmissions somewhat. -Adam Giles Honeycutt wrote: > Keith, > I am working on a novelty project. I am currently looking at a product > purchased at Spencer's gift shop. It is a remote controlled fart > machine. > You can see the product I purshed at: > http://www.thefartmachine.com/product.htm > I did not buy it at that link, I only found the link by searching for the > name on the package. > Anyway, the receiver (aka noise maker) needs 4 AAA batteries. > The transmitter comes with a small alkaline battery already > installed!! It > is a A23 12VDC The transmitter has a LED indicator and is in a relatively > nice keychain car alarm style package. > I am considering using the board out of the fart machine to do what I > need, > and to use the keychain remote as it sits. > But it is interesting looking at the circuit boards involved to see how > simple they are. > > Anyway, the shelf price at the high priced Spencer's is 16.99 and I have > seen it on the net for much less. I don't think I can build my own > transmitter and receiver for less. My target is about 100 units. > Anyway, I am considering tracing out the circuit used is this device for > reference. As of yet, I do not even know the frequency this thing > works at. > I know the transmitter is very simple, and the receiver is using a quad > opamp. > > Any input will be appreciated, > Giles > > > >> From: Keith Christopher >> Reply-To: pic microcontroller discussion list >> To: PICLIST@MITVMA.MIT.EDU >> Subject: Re: [PICLIST] [PIC]: RF Transmitters - Micro size >> Date: Mon, 4 Feb 2002 07:19:05 -0800 >> >> What are you looking to do with this transceiver ? >> What freq ? There is TONS of FM band transceivers on >> the WWW, a few caps, resistors, transistor and >> inductor and your on the air. You can with SMT make a >> small one, however your range is going to be limited. >> >> >> Keith >> >> >> >> --- Giles Honeycutt wrote: >> > Tal, >> > I am interested in something similar. I have a low >> > budget project, I need a >> > simple RF transmitter and receiver. I have been >> > looking for a off-the-shelf >> > keychain transmitter. But I can't seem to find any >> > cheap ones. All I have >> > found is over $20.00 >> > I found a gag gift that has a transmitter and >> > receiver at Spensers and it is >> > only $16.99! It has a keychain remote in it!!! >> > Anyway, I need a source for keychain remote and a >> > low cost receiver. >> > Anyway, some info that this list gave me in the >> > recent past is summed up in >> > a few links for RF stuff: >> > >> > home.att.net/~wzmicro/rf.html >> > www.rentron.com/ or >> > www.rentron.com/PicBasic/RemoteControl.htm >> > www.rfdigital.com/ >> > www.micrel.com/index.shtml >> > Maybe something will help, if you find a good >> > keychain remote, please let me >> > know. >> > >> > Best regards, >> > Giles >> > >> > >> > >> > >> > >From: Tal Bejerano - AMC >> > >Hi 2 All >> > > >> > >Did someone met/saw a very small RF transmitters? I >> > mean very small 4-5 mm >> > >size. >> > >low voltage and very low power. >> > > >> > >Thanks >> > > >> > >Tal >> > > >> > >> > >> > >> _________________________________________________________________ >> > Send and receive Hotmail on your mobile device: >> > http://mobile.msn.com >> > >> > -- >> > 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 >> > >> > >> >> >> __________________________________________________ >> Do You Yahoo!? >> Great stuff seeking new owners in Yahoo! Auctions! >> http://auctions.yahoo.com >> >> -- >> http://www.piclist.com#nomail Going offline? Don't AutoReply us! >> email listserv@mitvma.mit.edu with SET PICList DIGEST in the body >> >> > > > _________________________________________________________________ > Chat with friends online, try MSN Messenger: http://messenger.msn.com > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > > > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.