Sounds contrived. I adjust the volume and set/adjust cruise using the steer= ing wheel controls, without taking my eyes off the road. Sent from my phone > On Jul 18, 2014, at 12:39, David C Brown wrote: >=20 > Two buttons labelled "forwards" and "backwards" would be excellent if it > was light enough to read the labels. But slide projectors are usually > operated in a darkened room and, as I have discovered to my embarrassment= , > it is very easy to confuse the two buttons. You could label them in > Braille I suppose but that, for all but the registered blind, would be as > counter-intuitive as the single button so;ition. >=20 >=20 >> On 18 July 2014 19:58, Vitaliy M wrote: >>=20 >> It takes an engineer to argue that a single button projector interface i= s >> "reasonable". 'Cause, you know, a two-button interface (back/forward) is >> unnecessary luxury. :) >>=20 >> "The concept of an intuitive user interface is deeply flawed". Not reall= y. >> Few men would be baffled by two buttons labeled "forward" and "back". On >> the other hand, there are documented cases of people baffled by the >> "clever" single-button UI. >>=20 >>> And a designer who thinks his >>> interface is intuitive also thinks that that spareshim the necessity of >>> documenting it. >>=20 >> Non-sequitur, but I'll bite. I've never read my iPhone manual. But every >> time I go to use my air-air handheld, I am convinced that the guys who >> designed the UI, were guided by the motto "Screw intuitive UI, RTFM". >>=20 >> Sent from my phone >>=20 >>> On Jul 18, 2014, at 11:30, David C Brown wrote: >>>=20 >>> Panel space is the main limitation, along with the number of inputs to >> the >>> PIC. O remember that slide projector interface used to be common and >>> rarely caused problems. It is not unreasonable to expect users to have >>> some familiarity with the equipment that they are using. The concept = of >>> an intuitive user interface is deeply flawed since what is intuitive to >> one >>> man is deeply baffling to another. And a designer who thinks his >>> interface is intuitive also thinks that that spareshim the necessity of >>> documenting it. /rant >>>=20 >>>=20 >>>> On 18 July 2014 19:01, Vitaliy M wrote: >>>>=20 >>>> Why is "minimum panel hardware", important for this project? Cost, siz= e >>>> limitations, ... ? >>>>=20 >>>> A note of caution: engineers are known for being proud of clever >>>> solutions, at the expense of usability. >>>>=20 >>>> In one of the books on UI design, the author cites an example of a sli= de >>>> projector, where a single button was used to control the slide show. >> Click >>>> once to advance to the next slide. Hold the button for one second, to = go >>>> back. Genius! Except when an unfamiliar user is asked to run the >> projector, >>>> and the slides start to jump back and forth. The engineer shaved $0.10 >> off >>>> a $200 BOM, whoop-dee-doo. >>>>=20 >>>> If it's a one-off device, for your use, cost of the UI shouldn't be an >>>> issue. If it's something you're expecting to ship in volume, I would t= ry >>>> hard to make the UI as intuitive as practical. >>>>=20 >>>> Sent from my phone >>>>=20 >>>>> On Jul 18, 2014, at 6:17, David C Brown wrote: >>>>>=20 >>>>> I am building a simple pulse generator using an LTC6903 "synthesiser >>>> chip" >>>>> and a few TTL chips. The range will be from about 0.1Hz to 68MHz and >> the >>>>> frequency is set, geometrically, by a 15 bit control word. I will b= e >>>>> using a PIC16F87 to control the synthesiser and drive a display. >>>>>=20 >>>>> My problem is how to set the frequency by hand using the minimum pan= el >>>>> hardware. I need control at the finest level, stepping the control >>>>> register by one but also need to be able to make large frequency shif= ts >>>>> quickly, perhaps stepping the register by 2^10 >>>>>=20 >>>>> I have studied this for some time and come up with several solutions, >> non >>>>> of them entirely satisfactory, but I would appreciate, in the first >>>>> instance, suggestions which are not influenced by my thinking. >>>>> -- >>>>> __________________________________________ >>>>> David C Brown >>>>> 43 Bings Road >>>>> Whaley Bridge >>>>> High Peak Phone: 01663 733236 >>>>> Derbyshire eMail: dcb.home@gmail.com >>>>> SK23 7ND web: www.bings-knowle.co.uk/dcb >>>>> >>>>> -- >>>>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >>>>> View/change your membership options at >>>>> http://mailman.mit.edu/mailman/listinfo/piclist >>>>=20 >>>> -- >>>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >>>> View/change your membership options at >>>> http://mailman.mit.edu/mailman/listinfo/piclist >>>>=20 >>>=20 >>>=20 >>>=20 >>> -- >>> __________________________________________ >>> David C Brown >>> 43 Bings Road >>> Whaley Bridge >>> High Peak Phone: 01663 733236 >>> Derbyshire eMail: dcb.home@gmail.com >>> SK23 7ND web: www.bings-knowle.co.uk/dcb >>> >>> -- >>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >>> View/change your membership options at >>> http://mailman.mit.edu/mailman/listinfo/piclist >>=20 >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >>=20 >=20 >=20 >=20 > --=20 > __________________________________________ > David C Brown > 43 Bings Road > Whaley Bridge > High Peak Phone: 01663 733236 > Derbyshire eMail: dcb.home@gmail.com > SK23 7ND web: www.bings-knowle.co.uk/dcb > > --=20 > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .