I have recently completed a similar design based on a low cost Freescale sensor and UP/DOWN buttons in menu driven arrangement. I had similar problems related to restrictions upon display size as the 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 try 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 are 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 > --=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 .