SNS - Inverter Current #97
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This is all good, one more thing to do is add a test command to the debug REPL. You need to get the i2c object, then construct the sensor, and create a command that reads from the sensor, as well as doing the TOML parsing required.
LMK if you have questions on how that works
| logger.log(core::LogLevel::kDebug, "Inverter current: %d", *current); | ||
| }; | ||
| auto read_command | ||
| = std::make_unique<Command>(read_command_name, read_command_description, read_command_handler); |
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There should also be a usage entry here
| static const core::Float MIN_VOLTAGE = -3.3; | ||
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| // These can be adjusted | ||
| const int reference_voltage = 1.65; |
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const int ... = 1.65;
most type understanding webdev smdh (i'm totally not one now)
| static const int MAX_CURRENT = 75; | ||
| static const int MIN_CURRENT = -75; | ||
| static const core::Float MAX_VOLTAGE = 3.3; | ||
| static const core::Float MIN_VOLTAGE = -3.3; | ||
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| // These can be adjusted | ||
| const int reference_voltage = 1.65; |
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all of these should be in the header
| = inverter_current_voltage * ((MAX_CURRENT - MIN_CURRENT) / (MAX_VOLTAGE - MIN_VOLTAGE)) | ||
| + MIN_CURRENT; | ||
| const core::Float reference_voltage_biased = reference_voltage + virtual_ground; | ||
| const core::Float current_difference = current - reference_voltage_biased; |
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what does this do? I doubt it's valid to subtract a voltage from an amperage
| // The sensor maps -75A to 75A into -3V to 3V | ||
| // Since the ADC isn't differential, we need to differentiate the reference signal and the output | ||
| // signal | ||
| static const int MAX_CURRENT = 75; |
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int should be sized, std::uint32_t or whatever suits
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| // These can be adjusted | ||
| const int reference_voltage = 1.65; | ||
| const core::Float virtual_ground = MAX_VOLTAGE / 2; |
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what is the difference between reference voltage and virtual ground?
Sensors implementation for the inverter current sensor.
Datasheet: https://www.lem.com/sites/default/files/products_datasheets/hob-p_series.pdf