On Fri, Sep 28, 2012 at 6:56 AM, Tilman Baumann
<address@hidden> wrote:
On 28/09/12 00:24, Gerard Toonstra wrote:
If I'm not mistaken, the energy here refers to the total sum of potential energy (altitude) and kinetic energy (velocity).
Knowing your plane data, you can figure out what a desired energy sum should be in a given context and then figure out what the
current energy sum is by measuring airspeed and altitude. This allows you to use the throttle to increase or decrease energy.
The pitch is then a "command" that allows you to exchange kinetic energy for potential energy or vice versa.
My intention is to use the EzOSD current sensor. This has a chip underneath the sensor that does all the nasty work for you.
It measures the voltage and the current, which is all you need (it does mAh consumed too) and you get that through i2c.
You then need to configure the capacity of the packs you're flying with in paparazzi.
I came across this chip some time ago. Always wanted to give it a shot.
http://www.ti.com/product/ina219
HAL effect based sensor would be much cooler. But I could not quickly find a digital version.
I've never taken it apart, but it's a straight-forward i2c bus. Could even be some atmega8 with its own connections to
the current / voltage sensor and basically relaying it over i2c.
Gerard