On 6/4/12 8:08 PM, Tobias wrote:
Michel
I found on google that the i2c speed for the atmega (at least the ones
running arduino) is around 4705 bytes per second. The INA219 requires
2 bytes to be read each time.
Unfortunately this is way less than 8192 Hz already.
If I understood the INA219 datasheet correctly, the A/D frequency for
10 bits is< 7 kHz, so even if one can implement a faster i2c it will
still be less then ~8 kHz.
Not to worry! The INA219 has a built-in sample averaging mechanism.
You can ask it to take up to 128 samples and average them to produce one
number to receive over the I2C bus.
--
David Forbes, Tucson AZ
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