There are several interfaces proposed on the web and most of them are presented here. Each one is commented so that you can discover its advantages and limitations. I have also studied the electronic point of view for each schematic so that you can better understand how it works, or why it sucks...
The table below presents them. You have two major kind of interfaces: unidirectionnal and bidirectionnal. The first ones will only download profiles and information from the Aladin to the PC. The second kind will also let you change metric/imperial units, the beeper and PPO2max (on Nitrox computers),
From an electronic point of view, you have also two major classes: the operiationnal amplifier-based and the true RS232. In general, true-RS232 interfaces are better, since they will transform the Aladin signal into a well-conditionned signal for any computer. They are of course a little more difficult to build.
Operationnal amplifier-based circuits are the first ones developed. They sometimes lack precision in the design, but some of these are really easy to build. If you're not fmiliar with soldering, check'em first.
Please select an interface class in the table below to probe further. the cross-reference refers to costs and complexity for each one of the classes. The maximal cost is US$15, the minimal is around $2. Count 30 min to build the easiest one, something like a day to build the most complex.
