SparkFun Low Current Sensor Breakout -
ACS712
SEN-08883 ROHS
4
images are CC BY-NC-SA 3.0
Description: T
his current sensor gives precise current measurement for both AC and
DC signals. These are good sensors for metering and measuring overall power
consumption of systems. The ACS712 current sensor measures up to 5A of DC or AC
current. We added an opamp gain stage for more sensitive current measurements. By
adjusting the gain (from 4.27 to 47) you can measure very small currents.
The ACS712 Low Current Sensor Breakout outputs an analog voltage that varies
linearly with sensed current. To calibrate, first set the output offset to the desired level
(with zero current on the sense lines, read output with a DVM). Then with a known
current input (a 100mA limited supply works well for this), set the output deflection
with the gain pot. Sensitivity is then calculated as (Vref - Vdeflect)/(current input).
The bandwidth on the ACS712 Low Current Sensor Breakout has been set to 34Hz to
reduce noise when using at high gains. The full 80KHz bandwidth that the sensor is
capable of can be recovered by removing C1. See schematic for more details.
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s://www.s
arkfun.com/
roducts/888
