Russel, A1. How about spinning the annemometer while going through the menu. I would imagine it would need some sort of input to the speed measuring function to get an initial reading, then would allow you to change the parameter related to speed. A2. Here I would imagine that you would choose mps (which I guess to mean 'meters per second). I guess this because you said you got the thing at the local DSE store, which I take to mean "Dick Smith Electronics". And since DSE is based in Australia, I'm assuming that is where you are. And if this is true, you would be using the metric system of measure. So, knowing the volume of the duct, and the speed in mps, you can calculate the flow rate readily. These are just guesses mind you, so if I'm not even in the ball park, don't hold it against me. When you get the chance, let us (me) know how I did. Have fun with your weather station. Regards, Jim -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of Russell McMahon Sent: Tuesday, June 12, 2007 9:12 AM To: PIC List Subject: [OT]:: Today's problem - Adjust the anemometer Only if interested in problem solving (or you want to be able to operate a doofa that uses the same system when you buy one next week): I bought an anemometer at my local DSE store. It came without the instruction sheet. The instrument can measure air temperature in degrees C or degrees F and air speed in knots, mph, fps, kph, mps. It can also calculate & display wind chill factor. It can display the average air speed over 3,5,10 or 13 seconds or the maximum air speed since last turned on. The controls consist of two push buttons - on/off and mode. Pressing and releasing on/off once turns it on. Pressing and releasing on/off again turns it off. Pressing and holding on/off when off turns it on and displays all LCD segments. This shows all the parameters mentioned above. When the button is then released it is on. When turned on it started up in knots and degrees F. When I then pressed the mode button it cycled through the various time averaging settings and wind chill setting. No amount of button pressing would persuade it to go to other speed or temperature units. Being an accomplished digital watch user, even though not of the Nintendo (tm) generation, I know all about pushing several buttons at once and holding buttons down and ... . Hold mode down for a long time - nope. Turn on while holding mode down - nope. Press mode and on together - nope. No amount of trying would change it into the other units of measurement. I returned to the shop (I had been sitting outside trying it out as LONG experience told me that Murphy would rather I take it home untried) where they discovered that they in fact did have an instruction sheet. One glance told me how to change ranges. I left in embarrassment. Q1: How do you change ranges? Q2 Bonus question - The instrument will mainly be used to measure air speed in ventilation ducts (actually untrue, but that's close enough). What units of speed do I intend to leave it set to. Why? Russell -- 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