We just wanted to show some pictures about a recent project where we had to build some low-cost wireless soil moisture sensors. This post is a continuation of this other post but this time panStamp NRG is the module being used. Given its lower current consumption and wider voltage range, this sensor module should last around a year with readings every ten minutes or so.  Figure 1 : Cheap resistive soil-moisture sensor being read from a panStamp We had to adapt the shape of the wire antenna to fit the inner space of the enclosure but we are still getting sufficient ranges for the project.  Figure 2 : The whole circuit being powered from a CR2032 battery Configuring the right measurement and transmission interval is crucial since CR2032's 220 mAh could run out quickly.  Figure 3: wireless sensor module into enclosure with external on/off switch |
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