Digital Volt-Amp-Watt Meter

Large fischertechnik models include many motors and lamps and reach high power consumption. A simple bulb lamp requires up to ~100 mA and 1 W. 

This project provides a handy tool to get precise measures. It uses an INA219 as sensor and a MSP430 as MCU.

As usual, the module is cased on a 9V red box for a nice integration.

The INA219 is an I²C Voltage-Current-Power Sensor. 

Both the sensor and the screen share the same I²C bus, resulting in a very simple design and compact code.

Thanks to its built-in regulator, the smartMeter can be powered with 5–16 V. The measure range is wide enough for fischertechnik models, up to 26 V and 3 A. 

The full project has been developed using Energia and requires less than 8 KB.

Find the library at the I²C Voltage-Current-Power Sensor page.