Maybe take a look at these: http://www.mdfly.com/index.php?main_page=3Dproduct_info&products_id=3D201 On Sun, Sep 23, 2012 at 7:49 AM, Perry Curling-Hope wro= te: > Hi Dwayne > > The 7segment displays I applied are manufactured by Kingbright. > > The superbright red ( SC36-11SRWA) gives the highest luminosity for the > least foward current. > This is common cathode, they are also available in common anode (SA36-XX) > > Each package is only 7,5mm wide and the digit is relatively large in > relation to the package size. > Price is about 40c US per digit > > > http://www.kingbright.com/product_main_1.php?product01=3D20050504115323&p= roduct02=3D20050525114427&level=3D20050526104503&lang=3DEnglish > > The Freescale differential pressure sensor is an MPXV7002DP, range being > +/- 0.2 bar with a decent output, 4.75V full span, obviating the need for > fancy (and costly) instrumentation amplifiers > > http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=3DMPXV7002 > > As for my position regarding microcontrollers, I was much into the idea o= f > squeezing the max out of the least, always plumbing for the 'smallest' > micro which could do the job, more out of an aversion to being accused of > resorting to 'overkill' because of a lack of resourcefulness than anythi= ng > which made economic sense. > > I've used the 630/676's before, with success but accompanied by much > frustration and extra effort due to port limitations ..... volume price = is > $0.98 (Microchip website) > > The PIC16F887 is quoted at $1.78 which is about right, being available at > under R20 in South Africa. > For an extra 80 cents you get 44 pins, 4 full 8 bit ports plus the E port > and a whole lot of bells and whistles besides, making it a dream to desi= gn > with and program. > > So it's overkill for a HVAC controller....so what! > > Best Regards, > > > > On Sun, Sep 23, 2012 at 4:05 AM, Jesse Lackey = wrote: > >> Speaking of OLED ... be aware of limited lifetime, things like 3000 >> hours, 9000 hours, etc. is sometimes specified. Not sure if that means >> the display dims to 50% (or whatever) of initial brightness, or pixels >> drop out, etc. >> >> If it needs to be on all the time this would certainly need to be >> considered. If it needs to be on only when someone is fiddling with the >> menu buttons, no problemo. >> >> These folks may not be cheap enough, but have a nice selection and good >> datasheets, etc: >> >> >> Cheers >> J >> >> >> Perry Curling-Hope wrote: >> > I have recently completed a similar design based on a low cost Freesca= le >> > sensor and UP/DOWN buttons in menu driven arrangement. >> > >> > I had similar problems related to restrictions upon display size as th= e >> > unit was to be embedded into the doorpost of a laboratory drying unit, >> the >> > doorpost being only 50mm wide overall. >> > Standard LCD character displays are cheap and versatile but too wide, >> tiny >> > ones are too expensive, and I ended up with four tiny 7segment led >> displays >> > (power hungry, but this is cheaply overcome) >> > >> > I do not know what micro controller you are using, but your design >> > description prompts two general comments. >> > >> > The new Enhanced Performance PIC micro controllers offer vastly >> increased >> > functionality (and pin count) at much lower prices than the older >> > chips...there is no longer advantage to be gained hacking about with a >> > 'small' PIC and in conjunction with shift registers and decoders to tr= y >> and >> > save costs. >> > >> > The OLED displays will be ideal if their price is acceptable, the one >> you >> > mention supports both I2C and SPI ( 2 and 4 wire) interfaces, which ar= e >> > also supported by many of the newer PIC controllers. >> > >> > >> > On Sat, Sep 22, 2012 at 4:17 AM, Andrew Burchill >> wrote: >> > >> >> Hi, >> >> >> >> http://www.displaytech.com.hk/ >> >> http://www.displaytech-canada.com/products/cogmodules.php >> >> >> >> any better ? >> >> >> >> My real problem with purchasing production parts from eBay vendors is >> >>> long term supply. I need to be able to purchase parts for at least = a >> >>> 5 to 10 year timeframe. >> >>> >> >>> Please keep the suggestions coming - they all help. >> >> >> >> >> >> regards >> >> AB >> >> -- >> >> http://www.piclist.com PIC/SX FAQ & list archive >> >> View/change your membership options at >> >> http://mailman.mit.edu/mailman/listinfo/piclist >> >> >> > >> > >> > >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > > > -- > Perry Curling-Hope > > Research and Development > > > --=20 Perry Curling-Hope Research and Development --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .