LDRs or Light Dependent Resistors are very useful especially in light/dark sensor circuits. Normally the resistance of an LDR is very high, sometimes as high as 1000 000 ohms, but when they are ...

This humidity sensor consists of 2 copper conductors that are located at small distance from each other. ... You can use other sensors like LDR or NTC instead of the copper ones so you can use this ...