Hello, Pramode C.E. a écrit : > I am forming the outline of some user-level > documentation - any suggestions regarding use of > specific tools for writing the docs (plain old LaTeX, > plain HTML, LyX, > Scribus, OpenOffice, DocBook ...). Hmmm.... the more structured is the tool, the more flexible and portable your document may be. There is always a tradeof between high structuration and ease of access to contributors. OpenOffice may be a good bet, provided you really use the structuration tools included with it. Don't hesitate to create the necessary markup tools. For example, if you include code lines, do use the Stylist (Format->stylist...), use the tool icon with a popup help "New Style from Selection" and create a style "code" from the style "default". Then you may later parse the XML produced by OOo to output well-formatted documents in every case. As soon as you defined the new style "code", it appears in the Stylist, and you can by right-clicking it, define specific attributes, like a particular font, an color, etc. (for example Courier pitch 10, brown). So when you use your markup, there is a wysiwyg behavior. The style can be exported and used in more than one document. > identifying experiments which can be > done *without* using expensive and often > hard-to-obtain > sensors - the only kind of sensors which can be > purchased without too much difficulty here in India > are (a) basic heat sensors (b) light - LDR, > phototransistor, stuff like that) - any suggestions > in this regard? some inexpensive sensors I already used : - a screen with regularly distributed rectangular holes (or the same printed with opaque ink on a transparent medium) ==> speed sensor when passing in an optical detector. - a black/white linear gradient (make it with sketc or any other SVG editor), printed on a transparent sheet ==> one-dimensional position detector when put between a light source and a light sensor area greater than the pitch of the printed gradient. I use the printed gradient clipped in a slide frame, the frame has holes to bind it to other devices. - coils around a tube ==> speed sensors and detectors for moving magnetic small dipoles, for example magnetic stirrers used in chemistry labs. For example is the tube is vertical, and the stirrer falls inside it (with air or any liquid), each coil around the tube emits a signal (the zero crossing may be a date for the event), whose peak-to-peak voltage is representative of the speed. > Would it be possible to identify > experiments in the fields of Earth/environment > sciences (Phoenix controlled weather station - a > simple wind speed measuring instrument which generates > rotational movement the speed - a rotating magnet near a coil yelds a signal whose peak-to-peak voltage accounts for a speed. Of course optical detection is straightforward if the rotating body is fitted with a little mirror. > of which can be measured > using some photo sensor + digital input pins; some > setup to measure humidity - things of that sort), - any resistive device, used with a capacitor and a HFE4093 chip gives a reliable oscillator, whose frequency can be related to the resistor value. Take in account the necessity to regulate the supply voltage (LM78L05) since it also modifies the frequency. - humidity sensor : you may try digitated electrodes made of conductive ink on a paper saturated with a Cobalt chloride salt. If the conductive ink is not that easy to use, you may use other electrodes, but they must be of a metal more noble than cobalt (for example silver.. you may try the alloys of some coins also) > Chemistry, Biology, Industrial control and > even basic electronics (software `gates' using > digital input+output pins, `analog computers' using > OP-AMPS ...) wide, very wide fields. If you can describe more precisely one measurement to be done I may try some trick. Cheap sensors are seldom linear and long-lived, but they are handsome to teach useful concepts. However their conception is often challenging. Best regards, Georges.