An Arduino based solution to log your daily power consumption to an SD card.
On most modern electricity meters there is a flashing red LED that indicates the power consumption. By utilizing a photo resistor, this LED can be used to wake up a Ardunio from deep sleep and log the time of the blink to an SD card.
- Ardunio Pro Mini 3.3V with Serial-Adapter (Remove the the power LED to reduce power consumption in deep sleep)
- Tiny RTC I2C DS1307 (Remove R2 and R3 to reduce power consumption)
- 10K Poti
- Photo Resistor
- Li or LiPo Battery (1000mAh - 3000mAh)
- Micro SD-Card with SD Adapter-Card (Can by directly soldered to the SPI pins of the Arduino)
