A weblog focused on interesting circuits, ideas, schematics and other information about microelectronics and microcontrollers.
EnerJar - DIY power draw meter
Theis an easy-to-build device that accurately measures the power draw of electrical appliances.
The schematic may look complicated, but the EnerJar's electronics are actually quite simple. Power is voltage times current, so we must take these values and provide them to the PIC as inputs, so that it can perform the calculation. There is also a bit of wiring for the LED display.
Seriously, the EnerJar does some pretty crazy things with AC voltage. Be careful when building it. Below are some design and building notes. Look for more photos and detailed build instructions in the coming days.