These notes are taken originally from a session presented at the STAWA conference (Science Teachers' Assoc. of W. Aust.) in May, 1997 and also at the MAWA conference (Maths Assoc. of W. Aust.) in Bunbury, Western Australia in August, 1997. It was written for the HP38G but users of more recent calculators will find it easy to follow.It is possible to "program" the HP at different levels, depending on how computer literate you are. Listed by increasing difficulty, you can….
Note: Extensive material on programming the HP can be found on my Help page.
Only the last two of these options require any programming knowledge at all and all of them are made vastly easier by the use of the ADK39 (Aplet Development Kit). Shown in the following pages are some examples using the Aplet Development Kit to perform the first two of the tasks mentioned above.
The ADK39 is a piece of free software created by HP and available from my Utilities page. This software, which only runs under Windows, allows you to design and modify your aplet or note on the PC and then download it to the calculator via the cable. If you have a 39g+, 39gs or 40gs then your cable came with the calculator. Otherwise you have to buy one. See the Hardware section of the Help page.
This web site also contains links to aplets that I have developed for the HP. These are free and can be downloaded and copied freely as long as you don’t try to sell them or pass them off as your own!
Before you start…In each of these examples we will be using the Connectivity software to transfer the note/program/aplet created by the ADK39 onto the HP. It is very important that each of the notes, programs or aplets you create has its own directory. (Actually you can have a collection of notes in one directory if you are careful and experienced or lucky but I won't go into that here.)
The reason for this is that the Connectivity Kit looks for some special files called HPDIR39.000 and HPDIR39.CUR when it transfers files or aplets. These two files are sent to the HP and tell it what files it should expect in the transfer. If you don’t know what you’re doing then you can accidentally overwrite the files belonging to an old note when you create a new note.
Creating a NoteThe simplest way to do this is to create a small 'dummy' note on the HP, upload it to the computer using the Connectivity software and then finish editing and composing it on the computer using the ADK39. When you are satisfied with the result then you can download it back to the HP. One point worth remembering is that the Connectivity software saves all files (including notes) with an extension of .000 The ADK39, on the other hand, expects a note to have an extension of .NOT When you use the File-Open command you may need to select the option of seeing All Files (*.*) before your note becomes visible. Once you've done this the first time the ADK39 will remember that setting.
Transferring to the HP
In the Help page you will find a reference to a number of pages that explain how to transfer information, aplets and notes from the calculator to the PC. The method differs slightly depending on which calculator you have because the software is different.
Creating copies of Standard apletsRather than simply a note, you may wish to send the students home with a set of data to analyze. This can be done by making a copy of the Statistics aplet, loading it with the data you require, setting the axes to display nicely and then transferring this prepared aplet to the students’ calculator via the infrared link. Any of the six standard aplets can be copied in this way.
Change into the APLET view (see right). Move the highlight to the Statistics aplet and press the RESET button to reset the aplet back to factory defaults. You don’t have to do this every time but it ensures that you will see the same things as my snapshots during this practice run.
Now press the SAVE button and give the new aplet an appropriate
Table of Plant Growth for Days 1 to 9 of Experiment
You now need to switch to bivariate data. This is controlled by the button (see left) labelled ‘1VAR’. If you press this button, it will change to read ‘2VAR’.
Change into the PLOT SETUP screen and set the axes to appropriate values. Mine are shown right.
Pressing PLOT will show the data. Pressing the MENU button twice will clear the screen of everything but the graph.
You now need to change into the SYMB SETUP view and the SYMB view in order to specify what type of regression curve is to be fitted to the data. I decided to setup up for both a linear fit and and exponential fit (see right). My worksheet would then discuss which was appropriate.
Presumably you know that to find the actual values for the curve fit, you
change into the PLOT view and press the FIT button. Do not do this!!
If you now switch back to the APLET view, our aplet is now ready to be sent to the students using the infrared link (press SEND).
Last modified: 19 Dec 2007 Sitemap Home Contact Me