HydraFerret: Multi-sensor IOT with a simple interface.
The following table shows the supported sensors in this family and their characteristics. They work by measuring the voltage drop over a very small shunt resistor, typically in the range of 1 to 100 milliohms. The current does not pass through the sensor which measures the voltage drop over the shunt resistor. Changing the shunt resistor will change the current which the device can sense. Use the highest value shunt resistor which will cover the range of amps your device is expected to measure.
Since the ina3221 presents 3 channels to HydraFerret, each ina3221 is represented as 3 separate sensors. This allows each channel to potentially have a different value shunt resistor. Separate warning and critical alarms can be configured for each channel.
Note the ina226 has a separate "bus voltage" input which makes it use for both high-side and low-side current measurement. The other units are better used for high side only measurement, unless bus voltage and watts are not of interest. In high-side measurement the current sensor is place between the positive power source and the load. In low-side measurement the currrent sonsor is place between the load and ground. The ina226 also supports higher bus voltages and has the finest granularity of resolution of the supported devices.
critical|extreme|warning ina2xx <0-n> [volt|amps|watt] disable critical|extreme|warning ina2xx <0-n> [volt|amps|watt] <rpn-expression> enable or disable alerting thresholds on sensors devicename ina2xx <0-n> <device-name> Name a sensor device, use "inventory" to list device types i2c [<0-1> <sda> <scl> [speed]] Set i2c pins, eg: 21 and 22 for bus-0, and 5 and 4 for bus-1 interval [ina2xx <seconds>] Set the interval between measurements taken by the sensor. resistor [ina2xx <index> <milliohm>] Set resistance of shunt resistor for voltage measurement rpn variables: ina2xx.dev - count of ina2xx family of sensors (DEVice count) ina2xx.volt - Voltage (5 minute average) ina2xx.lasv - Last voltage reading ina2xx.shun - Shunt resistor voltage drop (5 minute average ina2xx.lass - Last shunt resistor voltage drop ina2xx.amps - Amps (5 minute average) ina2xx.lasa - Last amps reading ina2xx.watt - Watts (5 minute average) ina2xx.lasw - Last watt reading ina2xx.resi - shut resistor in milliohm ina2xx.blsb - Sensitivity: volts per bit (bus) ina2xx.slsb - Sensitivity: millivolts per bit (shunt) ina2xx.fsd - Full scale deflection for amps (max current reading)
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