Commercial meter readers are expensive; this DIY hack allows you to cheaply monitor your power consumption for a greener tomorrow (and, realistically, a much lower bill).
Paul discovered that his digital power meter sent out a pulse of IR light every time a watt-hour of power was consumed. He built a simple monitoring assembly in a project box that consisted of a small circuit board and a photo transistor. It’s a clever and inexpensive hack (it cost him less $20).
You can check out the details of his build at the link below. Don’t have a digital meter? Don’t worry, we didn’t want to leave anyone out in the cold. We found this build guide for an analog meter (the kind with the electro-mechanical disc that spins).