WITH A FEW INEXPENSIVE components and INT1Ch, you can turn the printer port of your PC into a high-current ammeter. This design's goal is to make remote high-current measurements, but you can use this technique to remotely measure any other similar analog electrical quantity, such as voltage and charge, at moderate speeds without going for expensive, PC-based general-purpose or tailor-made data-logging add-on cards.

In Figure 1a, a low temperature-coefficient manganin element senses the high current of the remote module. The manganin element gives an output of 0 to ...

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