![]() ![]() Your body’s resistance is fairly high at ~2-3 megaohms, and LDRs will parallel with your body if you hold one multimeter probe in one hand, touch one lead, while also having skin contact with the other probe, on the other lead. ![]() The fact that the temperature is affected by the LDR’s temperature makes the photoresistor unsuitable for high-precision light measurements, but it leaves many applications open.Īdditionally, note that there’s a ~10ms response time to light changes, which may or may not be a factor in your application.Īnother thing worth noting is that LDRs have such a high resistance in darker settings that you can’t reliably measure them while holding them with your hands. LDRs rely upon photoconductivity, which for the purposes of this article can be summarized as having low resistance through the photoresistor when exposed to light, and high resistance when not exposed to light.īetween these two points is a lot of room for sensing the actual light levels that the LDR is exposed to the type I’m using has only ~500kOhm in absolute darkness, and ~100ohm in strong noon sunlight. ![]()
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