Chapter 5. Creating a Moisture Meter with HiJack

Adding a Moisture Meter to the Tricorder

Back in Chapter 1 and Chapter 2, we explored the tricorder we all carry in our pocket. This project turns an iPhone or iPad into a quadcorder, hanging a HiJack A–D converter and sensor off the end and then using techBASIC to read it. We’re going to build a nifty moisture meter from off-the-shelf parts, as shown in Figure 5-1. Even the initial software is something you’ve seen before: we’ll start with the HiJack program from Figure 4-10 in ...

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