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== µWatch unofficial FAQs == | == µWatch unofficial FAQs == | ||
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I'm assuming you've already read the [http://www.calcwatch.com/faq.htm official uWatch FAQ], so we'll jump right into some more technical details. | I'm assuming you've already read the [http://www.calcwatch.com/faq.htm official uWatch FAQ], so we'll jump right into some more technical details. | ||
| − | == | + | == display == |
| − | : | + | |
| + | The [http://www.calcwatch.com/history.htm history of the uWatch] mentions the 53mm x 20mm compact 16x2 line LCD that convinced David L. Jones that the uWatch project was actually doable with off-the-shelf components. | ||
| + | If you are doing low-level programming of the uWatch, such as making "custom characters", you might want to look at [http://www.electusdistribution.com.au/products_uploaded/QP-5519-2.pdf the datasheet] (via [http://www.calcwatch.com/forum/viewtopic.php?id=37 "Moon Phases"]). | ||
| − | + | Alas, that original display pulls about 2 mA, more power than anything else on the uWatch -- even the CPU uses less power (at 250 KHz). That's the main reason the current uWatch cannot [http://www.calcwatch.com/forum/viewtopic.php?id=42 run the display continuously] (like a standard watch), but much be explicitly "turned on" every time you want to read the time. | |
| − | == | + | The current uWatch2 rough draft seems likely to use the |
| − | : | + | [http://www.newhavendisplay.com/index.php?main_page=product_info&cPath=3_113&products_id=1824&zenid=goih7iect56osjf64srb498qi4 Newhaven NHD-C12832A1Z-FSW-FBW-3V3] 128x32 Pixels display. |
| + | Which uses less than 100uA which would enable a continuous display watch. The "white LED backlight" uses 30 mA at 3.0 V but is still very usable at much lower currents. | ||
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| + | Other proposed displays: | ||
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| + | * [http://www.crystalfontz.com/products/12864ap/index.html CFAX12864AP1 Graphic LCD]: discontinued, apparently replaced by CFAX12864T1. | ||
| + | * [http://www.crystalfontz.com/product/CFAX12864T1WFH.html CFAX12864T1-WFH Graphic LCD]: 128x64 display with EL backlight. (the EL backlight version seems to require less power than the [http://www.crystalfontz.com/product/CFAX12864T1TFH.html white LED backlight version]). | ||
| + | * [http://www.avesodisplays.com/products/index.html card display]: 6 digit, 7 segment display module designed to fit inside a credit card. lightest-weight display of those on this list; adequate for 4-function calculator watch. Doesn't seem to show enough information for a scientific calculator. | ||
| + | * ... | ||
| + | * ... ''Have you seen a display that would work on a wrist calculator? Please add it to the list here!'' ... | ||
| − | + | Some threads discussing diplays: | |
| + | [http://www.calcwatch.com/forum/viewtopic.php?id=7 "Hardware Stuff » Why not a smaller LCD..."], | ||
== buttons == | == buttons == | ||
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claim to have "Real-time Clock/Calendar down to 500 nA". | claim to have "Real-time Clock/Calendar down to 500 nA". | ||
http://www.microchip.com/xlp | http://www.microchip.com/xlp | ||
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== further reading == | == further reading == | ||
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* [http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv018.cgi?read=142807 "What is the smallest full trig calculator in production?"] | * [http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv018.cgi?read=142807 "What is the smallest full trig calculator in production?"] | ||
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