Power Save - Deep Sleep for DHT and LCD
AmebaD [AMB21 / AMB22 / AMB23 / BW16] x 1
DHT11 or DHT22 or DHT21 x 1
LCD I2C screen x 1
Ameba-D supports low power modes which are deepsleep mode. Deepsleep mode turns off most of the system power domain. The power consumptions of core module in DeepSleep Mode is around 7uA to 8uA compare to normal state around 22mA. This example gives demo of system switch between “working” and “sleep”(power save).Using DHT sensor to read data and display on LCD screen when system is awake. After 5 seconds system auto enter DeepSleep Mode for power save. System will wake up by wakeup source.( Aon timer, Aon Pins or RTC timer).
“File” → “Examples” → “AmebaPowerSave” → “DeepSleep_DHT_LCD_Example”
DS_WAKEUP_SOURCEis used to set the wake-up source, user can chose 3 wake up sources now,
AON timer (SET_DS_AON_TIMER_WAKEUP); AON pins (SET_AON_WAKEPIN_WAKEUP); RTC timer (SET_DS_RTC_WAKEUP);
SET_AON_GPIO_WAKEUP_GPIOA25or the pin that you want to use as shown in the picture below.
DHTPINis used to set DHT sensor data pin. User can choose any GPIO pins.
DHTTYPEis used to set DHT sensor type. (DHT11, DHT22 and DHT33)
When finished the condition values setting, system will run and switch between normal working mode and deepsleep mode controlled by wakeup source. LCD screen will display the temperature and humidity data measured from DHT sensor when system is awake.
Please refer to the API Documents PowerSave section for detail description of all API.