ina219

INA219 current/power monitor driver for Rust

Example

```rust extern crate i2cdev; extern crate ina219;

use i2cdev::linux::{LinuxI2CDevice}; use ina219::{INA219, INA219_ADDR};

fn main() { let device = LinuxI2CDevice::new("/dev/i2c-1", INA219_ADDR as u16).unwrap(); let mut ina = INA219::new(device);

ina.calibrate(&[0x10, 0x00]).unwrap();

let voltage = ina.voltage().unwrap();
println!("bus voltage: {:?}", voltage);

let shunt_voltage = ina.shunt_voltage().unwrap();
println!("shunt voltage: {:?}", shunt_voltage);

let current = ina.current().unwrap();
println!("current: {:?}", current);

let power = ina.power().unwrap();
println!("power: {:?}", power);

}

```