When Arduino is sleeping with POWER_DOWN sleep mode, the whole board consumes 15.5mA @3V from the battery. If you are using USB to power it (say you use a power bank), it consumes about 18.5mA. This is definitely not good enough for batteries. Even with a gigantic 20,000mAh power bank, the maximal time is 45 days. The efficiency of the boost converter and activities (other than sleeping) will reduce this to just a handful of days.

So if some of you thinks this is not really what a "pico" processor promises, then I am sorry to tell you that the Nano just wasn't designed for battery operation. The CH340 consumes a certain amount of power even when sleeping. About 0.15mA at 5V so it could translate to 0.25mA at 3V. Its pull-up and pull-down resistors also cost similar amount of current draw. There is no way to remove the CH340 chip and still use the USB port. Using an arduino mini will solve this problem since it has no USB chip.


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On a data logger I designed around ATMEGA1284P, I used FT232 but it will not receive power from the battery. The power consumption is about 0.4mA when sleeping. Not as low as it can go but good enough for 6 months.

I have used a deep sleep mode as well as some hardware modifications to bring the power usage (in power-down interrupt sleep) to 60.000 times less than the normal (non power save) usage.

There are TWO general methods to work with deepsleep. Method ONE wakes up the device on a regular intervall, wait for TELEPERIOD and immediate go to deepsleep again. This is mostly to make regular measurements and send them to a MQTT broker. Method TWO is more complex and use TIMER events to wakeup the device. The way and when the device go to deepsleep again depends on the configuration. See explanation below.

With Version 13.2 there is a new functionality to use TIMERS for the wakeup process on deepsleep. In this case the deepsleeptime will be dynamically calculated through the TIMERS. To enable TIMERS on deepsleep there must be a rule1 Wakeup

Now every TIMER that has RULE as an action will wakeup the device at the proposed time. You can define multiple timers and multiple wakeups also defined on sunset or sunrise. The process will always select the NEXT wakeup it finds. As soon as all conditions meet a 60 second timer countdown starts to send the device to deepsleep. To prevent this it is recommended to disbale ALL timers on the UI during definition. If you tag the rule1 with ONCE the device will stay awake after the deepsleep. To send the device to deepsleep e.g. at sunset another rule can be used to do this:

An example of a ruleset which deepsleeps a device with a RTC module attached during a certain portion of the day (i.e. at night). Mem1 is set to wakeup time in the morning (i.e. 540) and Mem2 to sleep time (i.e. 1080). For network attached devices with no RTC module, time#initialized trigger is better than system#init. Might be smart to have a DeepSleep gpio assigned if you need to access the device outside of normal awake hours. rule1 on system#init do backlog event timecheck=%time%; ruletimer1 1 endonon time#minute do event timecheck=%time%; ruletimer1 1 endonon event#timecheck%mem1% do Var1 0 endonon event#timecheck>%mem2% do Var1 3600 endonon rules#timer=1 do deepsleeptime %var1% endon

For example the ruleset below turn on power right after Tasmota started, and turn it off just before entering DeepSleep Rule1 ON Power1#Boot DO Power on ENDON ON System#Save DO Power off ENDON Any rule apply AFTER the Init() procedures of all sensors/drivers. This does mean that a POWER OFF on the GPIO may prevent sensors from being initialized correctly during start-up (e.g. DS18B20) and do not show up in teleperiod message. To ensure the GPIO is HIGH during restart you should define in the Configure --> Configure module --> GPIO x to Output Hi instead of RELAY 1 and avoid using any rules. To ensure the GPIO goes LOW after deepsleep you need to solder a 4.7K resistor between GND and the GPIO.

If the device is not able to make a WIFI connection and get an IP during the first 15 seconds after boot it will go again without any further actions into deepsleep for another cycle. If you compile your own firmware you can change the timeout (e.g. 30 seconds) by setting #define DEEPSLEEP_NETWORK_TIMEOUT 30 in user_config.override or disable completely (device stay online until network connected) with #define DEEPSLEEP_NETWORK_TIMEOUT 0. If MQTT or NTP does not work the TELEPERIOD will execute anyhow and send the device to deepsleep afterwards. A wrong NTP will result in wrong timestamp send to MQTT. A missing MQTT connection will avoid any send.

Another method to send the device into deepsleep after start is creating a rule like the one below. In this case the timeout can be configured online and changed. Rule1 ON Dimmer#Boot DO RuleTimer1 30 ENDON ON Rules#Timer=1 DO DeepSleepTime 3600 ENDONRule1 ON

Based on run time and the error in the last loop, a new sleeping time will be calculated. This will be multiplied by the deepsleep_slip and, ideally, the device will wake up at the time above. 13:08:48 Sleeptime 285 sec, deepsleep_slip 10257

The amount of power saved during deep sleep depends significantly on the type of ESP module used. For example, an ESP-M3 module drops to 20-25 uA at 2.5-3.3 V when in deep sleep. Other devices, with onboard regulators, USB chips etc. like the WEMOS D1 Mini, may still require 18 mA at 5 V when in deep sleep (i.e.: greater than 1000 times more power).

For the record, checked my dashcam recording and the time of the deep sleep message and it was abut 17.5 hours that vehicle was left with interior lights on (not just one map light - all of the interior cabin lights) that triggered deep sleep. Not sure how long after that the battery was dead.I didn't go to the vehicle for another 24 hours after deep sleep mode started.

It makes no sense that having only one or all of the interior lights on would allow the battery to drain to the point of being dead, isn't there supposed to be a built in battery saver function that automatically kills all accessory power if anything is left on for like 10 minutes or something? Every Ford/Lincoln vehicle I've seen in recent memory has had that battery save feature on it and it does work. Many times on our company vehicles (Fusions, Edge, MKX, Escape, etc.) employees would drop of car after shift and accidentally leave light on or door/trunk ajar and it never killed the battery.

I have the same issue and have tried everything but the battery quickly depletes. It used to be fine so something changed. I have all the optimizations turned on, battery saver, deleted used apps, put other apps to deep sleep etc but I will be down to single digits by 8pm, even with little use. I am disappointed in the phone but I only had it for 1.5 years and it was expensive.

The RTC IO module is enabled in this mode, so internal pullup or pulldown resistors can also be used. They need to be configured by the application using rtc_gpio_pullup_en() and rtc_gpio_pulldown_en() functions before calling esp_deep_sleep_start().

By default, esp_deep_sleep_start() and esp_light_sleep_start() functions power down all RTC power domains which are not needed by the enabled wakeup sources. To override this behaviour, esp_sleep_pd_config() function is provided.

esp_light_sleep_start() or esp_deep_sleep_start() functions can be used to enter Light-sleep or Deep-sleep modes correspondingly. After that, the system configures the parameters of RTC controller according to the requested wakeup sources and power-down options.

However, it is possible to call this function to substitute a different deep sleep stub. Any function used as a deep sleep stub must be marked RTC_IRAM_ATTR, and must obey the same rules given for esp_wake_deep_sleep().

Autools offers built-in options to toggle location mode (off, device only, battery saving, high accuracy), mobile-data (on/off), battery saver (enable/disable), notification listeners etc.

During deep sleep mode, the primary CPU is turned off, whereas the Ultra-Low-Power (ULP) Coprocessor can take sensor readings and wake up the CPU as needed. This sleep pattern is referred to as the ULP sensor-monitored pattern. This is useful for designing applications where the CPU needs to be woken up by an external event, a timer, or a combination of these events, while maintaining minimal power consumption.

Because RTC memory is kept active, its contents are preserved even during deep sleep and can be retrieved once the chip is woken up. This is why the chip stores Wi-Fi and Bluetooth connection data in RTC memory before entering deep sleep.

Hibernate mode is very similar to deep sleep. The only difference is that in hibernation mode, the chip disables the internal 8 MHz oscillator as well as the ULP-coprocessor, leaving only one RTC timer (on slow clock) and a few RTC GPIOs to wake the chip up.

Surface provides a simplified UI in accord with best practice powersetting recommendations. In general, it's recommended to only adjust settings visible in the default user interface and avoid configuring advanced power settings or Group Policy settings. Using the default screen and sleep timeouts while avoiding maximumbrightness levels are the most effective ways for users to maintainextended battery life.

Surface devices running Windows 10 build 1709 and later include a powerslider allowing you to prioritize battery life when needed or favor performance if desired. Youcan access the power slider from the taskbar by clicking on the batteryicon. Slide left for longer battery life (battery saver mode) or slideright for faster performance. ff782bc1db

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