Battery#

Introduction#

The battery class is derived from the brain base class and provides access to the EXP Brain’s battery, allowing your robot to monitor capacity, voltage, current draw, power usage, temperature, and efficiency.

Access#

Brain.Battery

Member Functions#

The battery class includes the following member functions:

voltage — Returns the battery voltage.
current — Returns the battery current draw.
capacity — Returns the brain’s remaining battery capacity.
temperature — Returns the battery temperature.

Before calling any battery member functions, a brain instance must be created, as shown below:

// Create the EXP Brain
brain Brain = brain();

voltage#

Returns the voltage of the EXP Brain battery. Voltage is the electrical pressure supplied to the battery, which can help you check whether the battery is charged enough for the robot to run reliably.

Available Functions

double voltage( voltageUnits units = voltageUnits::volt );

Parameters

Parameter	Type	Description
`units`	`voltageUnits`	Optional. The unit used to represent voltage: `volt` (default) — volts, or `mV` — millivolts

Return Values

Returns a double representing the battery voltage in the specified units, ranging from 7.0 to 8.0 V or 7000 to 8000 mV.

current#

Returns the electrical current drawn from the EXP Brain battery. Current is how much electrical flow the robot is using from the battery, which can help you see how hard the robot is working or whether motors may be under extra load.

Available Functions

double current( currentUnits units = currentUnits::amp );

Parameters

Parameter	Type	Description
`units`	`voltageUnits`	Optional. The unit used to represent current: `amp` (default) — amperes

Return Values

Returns a double representing the electrical current drawn from the EXP Brain battery in amperes, ranging from 0.0 to 15.0 Amps.

capacity#

Returns the remaining battery level of the EXP Brain battery.

Available Functions

uint32_t capacity( percentUnits units = percentUnits::pct );

Parameters

Parameter	Type	Description
`units`	`percentUnits`	Optional. The unit used to represent battery capacity: `pct` / `percent` — percent

Return Values

Returns a uint32_t representing the remaining battery capacity as a percentage from 0% to 100%.

temperature#

Returns the temperature of the EXP Brain battery.

Available Functions

1 — Returns the battery temperature as a percentage.
double temperature(
    percentUnits units = percentUnits::pct );

2 — Returns the battery temperature in the specified temperature units.
double temperature(
    temperatureUnits units );

Parameters

Parameter	Type	Description
`units`	`percentUnits`	Optional. The unit used to represent battery temperature: `pct` / `percent` (default) — percent
`units`	`temperatureUnits`	Returns the battery temperature in specific units: `celsius` — degrees Celsius, or `fahrenheit` — degrees Fahrenheit

Return Values

Returns a double representing the remaining battery temperature in the specified units.

Notes

The operating temperature range for the battery is approximately 20°C (68°F) to 70°C (158°F).