Here is the diagram of my Arduino infrared close proximity sensor. As you can see, ... the D13 signal output pin (TP4), which is logic-low (L) by default, ... Using pulsed light enables the sensor to ...

Adding a photoresistor (light sensor) and a thermistor (temperature sensor) and connecting them to a programmed Arduino gave me a gadget that monitors the environment of a single plant. You can ...

After uploading the code the Piezo will start making short beeps. On bright light the Piezo will only beep and on dark light it will be short. Some ideas for this experiment: Alarm for Lights in the ...