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LowPower
LowPower is a Lightweight low power library for Arduino, incorporated in the repository as a submodule so we can keep track of future improvements.
Its functionalities is wrapped inside the Common_Lib within a static class CCommon so it can be used very easily from the final projects that needs these functionalities. To sum up, is a library that reduces the power consumption of the Arduino Uno/Nano [ATMega328P] alongside other Atmel chips and used during moments that CPU processing is not needed, e.g., when we are waiting for a user interaction so we can power down the chip to reduce drastically its consumption and extend battery's life and wake it up when user interacts. Here a more technical explanations of why use it:
| Power mode | WDT | ADC | BOD | T2 | T1 | T0 | SPI | USART0 | TWI | Current |
|---|---|---|---|---|---|---|---|---|---|---|
| Idle | On | On | On | On | On | On | On | On | On | 3648.0 µA |
| Idle | Off | On | On | On | On | On | On | On | On | 3643.0 µA |
| Idle | Off | Off | On | On | On | On | On | On | On | * |
| Idle | Off | Off | On | Off | On | On | On | On | On | * |
| Idle | Off | Off | On | Off | Off | On | On | On | On | 3618.0 µA |
| Idle | Off | Off | On | Off | Off | Off | On | On | On | 927.0 µA |
| Idle | Off | Off | On | Off | Off | Off | Off | On | On | 832.0 µA |
| Idle | Off | Off | On | Off | Off | Off | Off | Off | On | 789.0 µA |
| Idle | Off | Off | On | Off | Off | Off | Off | Off | Off | 687.0 µA |
| ADC Noise Reduction | On | On | On | On | – | – | – | – | – | 651.0 µA |
| ADC Noise Reduction | Off | On | On | On | – | – | – | – | – | 646.0 µA |
| ADC Noise Reduction | Off | Off | On | On | – | – | – | – | – | * |
| ADC Noise Reduction | Off | Off | On | Off | – | – | – | – | – | 584.0 µA |
| Power Save | Off | Off | Off | Off | – | – | – | – | – | 1.7 µA |
| Power Save | Off | Off | Off | On | – | – | – | – | – | 416.0 µA |
| Power Save | Off | Off | On | On | – | – | – | – | – | 435.0 µA |
| Power Save | Off | On | On | On | – | – | – | – | – | 527.0 µA |
| Power Save | On | On | On | On | – | – | – | – | – | 531.0 µA |
| Extended Standby | Off | Off | Off | Off | – | – | – | – | – | 202.2 µA |
| Extended Standby | Off | Off | Off | On | – | – | – | – | – | 416.0 µA |
| Extended Standby | Off | Off | On | On | – | – | – | – | – | 436.0 µA |
| Extended Standby | Off | On | On | On | – | – | – | – | – | 527.0 µA |
| Extended Standby | On | On | On | On | – | – | – | – | – | 531.0 µA |
| Standby | Off | Off | Off | – | – | – | – | – | – | 201.7 µA |
| Standby | Off | Off | On | – | – | – | – | – | – | 218.5 µA |
| Standby | Off | On | On | – | – | – | – | – | – | 309.9 µA |
| Standby | On | On | On | – | – | – | – | – | – | 313.9 µA |
| Power Down | Off | Off | Off | – | – | – | – | – | – | 1.7 µA |
| Power Down | Off | Off | On | – | – | – | – | – | – | 18.6 µA |
| Power Down | Off | On | On | – | – | – | – | – | – | 110.0 µA |
| Power Down | On | On | On | – | – | – | – | – | – | 113.9 µA |
Legend:
- WDT: Watch Dog Timer
- ADC: Analog-to-Digital converter module
- BOD: Brownout Detector
- T0, T1, T2: Timers 0, 1 and 2
- SPI: Serial Peripheral Interface module
- USART0: Serial port module
- TWI: Two-wire interface (I2C)
Comparison sleep modes power consumption set on setup() with nothing in loop() and with the bare-bone ATMega328 chip + Voltage regulators (for +5V and +3.3V) + USB interface chip (for the USB port) + "power" LED instead of a full equipped Arduino Uno:
- SLEEP_MODE_IDLE: 15 mA
- SLEEP_MODE_ADC: 6.5 mA
- SLEEP_MODE_PWR_SAVE: 1.62 mA
- SLEEP_MODE_EXT_STANDBY: 1.62 mA
- SLEEP_MODE_STANDBY: 0.84 mA
- SLEEP_MODE_PWR_DOWN: 0.36 mA
- BOD: 60 µs
- INT and PCINT: all power save modes. This the preferred method as it can be attached to external interaction with e.g. a joystick/button.
- TWI address match: all power save modes
- Timer2: IDLE, ADC, PWR_SAVE, EXT_STANDBY
- WDT: all power save modes
- ADC: IDLE, ADC
Please, feel free to add any question or bug here
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