Adafruit INA219 FeatherWing
PRODUCT ID: 3650
Description
The INA219 FeatherWing makes power‐monitoring problems a thing of the past. Instead of struggling
with two multimeters, you can just use the handy INA219B chip on this breakout to both measure both
the high side voltage and DC current draw over I2C with 1% precision. Works with any and all Feathers!
Communicates over I2C so its super‐simple to use, you can even change the I2C address to have up to 4
of these Wings on one Feather.
Many current‐measuring devices are only good for low side measuring. That means that unless you
want to get a battery involved, you have to stick the measurement resistor between the target ground
and true ground. This can cause problems with circuits since electronics tend to not like it when the
ground references change and move with varying current draw. This chip is much smarter ‐ it can
handle high side current measuring, up to +26VDC, even though it is powered with 3.3V. It will also
report back that high side voltage, which is great for tracking battery life or solar panels.
A precision amplifier measures the voltage across the 0.1 ohm, 1% sense resistor. Since the amplifier
maximum input difference is ±320mV this means it can measure up to ±3.2 Amps. With the internal 12
bit ADC, the resolution at ±3.2A range is 0.8mA. With the internal gain set at the minimum of div‐8, the
max current is ±400mA and the resolution is 0.1mA. Advanced hackers can remove the 0.1 ohm current
sense resistor and replace it with their own to change the range (say a 0.01 ohm to measure up 32
Amps with a resolution of 8mA)
Technical Details
Product Dimensions: 51.0mm x 22.8mm x 3.6mm / 2.0" x 0.9" x 0.1"
Product Weight: 3.4g / 0.1oz
https://www.adafruit.com/product/3650 10‐30‐17
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