Questions tagged [sleep]

Use this tag for questions concerning low power sleep states, eg. a battery powered circuit waiting for an external event to happen.

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6
votes
1answer
5k views

Actual power consumtion of xbee series 2 in sleep/power down mode?

According to user manual and several other official documents from Digi, xbee in the power down/sleep mode can consume as low as 1uA. But somehow such a low power consumption seems simply unachievable ...
0
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0answers
28 views

Interfacing Arduino with TSL235 (light to frequency converter)

I am working on an Arduino based circuit that uses light to frequency converter (TSL235) to trigger a buzzer when there is an intensity change in the ambient light (for example when a car is pointing ...
1
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0answers
21 views

Wake up with external Interrupt from deep sleep mode (Adafruit Feather 32u4)

I have an Adafruit Feather ATMega 32u4. I want to put it into sleep mode and wake it up with pressing a switch as an external interrupt. This is what I tried so far and which worked: switching a LED ...
0
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0answers
21 views

Current consumption is even worse in STOP2 than in Run Mode Range 2

I am using the STM32L431CC microcontroller and I am learning on saving power with the STOP2 mode. I found an example code that demonstrates how to use the STOP 2 mode on a different microcontroller of ...
2
votes
1answer
254 views

Put RS485 microcontroller and transceiver to sleep and wake it up on incoming data

I have to do a network of devices based on MCU. This network in a RS485 and the device is battery powered. For save the battery I put the MCU into sleep mode and I want to wake the MCU up, when ...
0
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0answers
29 views

Sleep current of automotive device increasing over time

I have something like a tire pressure monitor. It is battery operated. I haven't done automotive before and it is a whole other world besides consumer. I put in all high temp components (i,e, 40-125C ...
1
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0answers
33 views

Low Duty Cycle (LDC) Mode Issues on RF Transceiver

I am experimenting with Low Duty Cycle Mode (periodical sleep and active state transitions to reduce average power consumption) on the SPSGRF-915 RF Transceiver, based on the SPIRIT1 RF Module, which ...
0
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1answer
2k views

How to use both RTC and RTC alarm on STM32?

I've got a board with STM32F103C8T6 and a 32.768 kHz external crystal. The RTC module of STM32 is used as a calendar as I set the prescaler to 32767. But, to reach the minimum power consumption, I ...
0
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2answers
304 views

STM32 standby mode power consumption is too high

I'm experimenting with standby mode on STM32F407VGT6. I know how to put MCU into standby mode(or I think to know that). I'm doing that with this init function: ...
1
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1answer
661 views

How to wake STM32F103 by RTC using HAL libraries / Registers?

I've started digging into STM32F103 using HAL Libraries and raw registers. It's the first time to program at such low level. Anyway following a video I've successfully implemented "Standby" mode. ...
0
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0answers
36 views

ESP32 High Power Consumption in Deep Sleep Mode

I'm running a Python program on an ESP32 (MicroPython firmware) that fetches online data to save it locally every 5 hours, and then goes into deep sleep mode. The board is powered with a 3.7V lipo ...
0
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0answers
35 views

3 T Finfet Leakage reduction circuit techniques (VLSI)

What are the circuit techniques to reduce leakage in a 3T Finfet (front and back gate shorted) circuit? Vth in a 3T Finfet is almost always constant, so there is almost no stack effect and hence sleep ...
0
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1answer
43 views

how to put Atmega328 to sleep mode and wake it up without button,without WDT

iam building a IR based faucet i need to include battery backup here iam using only ATmega328 with crystal and capacitor, iam not using regulator or LED ...i need to increase the battey life iam using ...
1
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0answers
65 views

Configure STM32 to sleep inside an ISR

I am doing a test project to test the STM32's sleep mode feature. The project involves two microcontrollers: STM32F411 with a push button, which when pressed, sends data through SPI to an STM32F303 ...
0
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1answer
25 views

Idle supply current at frequency or vcc

I'm trying to figure out how much power I can expect my ATTiny84 to use in idle mode and I'm not sure which of the two graphs from the datasheet I should use, or why there are two in the first place. ...
0
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4answers
6k views

How to wake up SIM800 module from sleep, after entering sleep mode 2 (AT+CSCLK=2)?

I want my SIM800 module (I interfaced it with Arduino Uno) to enter sleepmode-2 (I used AT+CSCLK=2 command). My question is, how do I wake it up from sleep? I tried giving various AT commands but I ...
1
vote
1answer
140 views

nRF52 GPIO configuration in sleep mode to prevent peripherals from drawing current

I have a battery-powered board with an nRF52832 and some peripherals that I am writing a new firmware for. When set to sleep (NRF_POWER->SYSTEMOFF=1;) the board still draws way too much current (...
1
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2answers
105 views

STM32L4+ UART doesn't work after entering STOP2

I'm just getting into learning the low power states of STM32s and this is my first project trying to use STOP mode so please forgive any noob mistakes. This code is based very similarly of the example ...
0
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3answers
87 views

Low-power Linux-based ARM system on module for data logger? [closed]

I want to develop a data logger with several hardware characteristics (low-power consumption, SDI-12, I2C, SPI, UART, USB, Ethernet, touchscreen display, SD card, RTC, internal memory at least 128MB......
0
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2answers
204 views

Is it possible to set up multiple wake up interrupts on STM32. ? How to manage multiple sensor reading intervals?

I am new to developing applications on STM32 development boards. Currently i have STM32 IoT discovery kit. I am able to configure all the sensors and read data. I am interested in low power design ...
0
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0answers
32 views

Fail to reboot after recharge, ESP32/ESP8266 using a MPPT and 18650 battery

I try to build a solar energy operated project. I'm using an ESP32 to wake up every 45 minutes, measure bat's voltage using board's ADC, and send it to an excel sheet on Google drive. The part of ...
1
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1answer
91 views

How to avoid a MCU to run constantly when a superheterodyne radio receiver is receiving nothing, and possibly enter in deep sleep?

TL;DR: How to avoid an ATtiny to run constantly when the radio receiver is receiving nothing, and possibly enter in deep sleep mode? Configuration: ATtiny45 (on breadboard) SRX882 Superheterodyne ...
1
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2answers
7k views

How to stop/reset the watchdog timer from low-power sleep mode on an STM32L0C8?

On an STM32L0C8 MCU, I have the watchdog enabled while executing. At certain points in execution, I would like the chip to go into low power sleep mode. When it goes into low-power sleep mode though, ...
0
votes
1answer
42 views

Can a server send data to my SIM800c while it is in sleep mode?

I have a SIM800c and I'm also using an adafruit.io server. I'm building an alarm system and I'm wondering if I will be able to send commands to the system using the server while the GSM module is in ...
1
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3answers
192 views

pic16f628a timer1 interupt wakeup from sleep

I have a problem with sleep mode on PIC16F628a. Configuration: microcontroller running on 4Mhz internal oscillator. 32kHz external oscillator on T1OSI/T1OSO pins. Program below works fine (having ...
6
votes
5answers
6k views

ESP32: how to keep a pin high during deep sleep (RTC GPIO pull-ups are too weak)?

I'm using an ESP32 in a battery-powered device. The ESP spends most of the time in deep-sleep to save power. The device also has some 5V-powered sensors which I'm feeding from a MCP1640 step-up ...
1
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0answers
52 views

ESP8266 vs ESP32 and WakeUp vs Reset

Maybe it's my fault but I kinda dislike the design of the ESP8266 when it comes to wakeup from deep sleep via an interrupt. AFAIK (without an external circuit) the ESP8266 can not distinct between a ...
0
votes
1answer
570 views

Reducing current consumption for a PIC16 in Sleep mode

This might appear as one of those tens of questions that ask about power consumption on a PIC microcontroller. But after I have failed to reduce the current consumption to an acceptable level despite ...
1
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0answers
344 views

stm32 does not exit sleep

When trying to implement sleep mode it appears the code enters and exits sleep mode once and then gets stuck in sleep mode after and will not wake back up. I posted some code below of what I believe ...
1
vote
2answers
119 views

328p-pu drawing too much current in sleep mode

I have a ATmega328p-pu and run it at 8MHz with the internal oscillator. I am executing some code and then send the chip to sleep. I deactivate the brownout and ADC before activating the sleep. I have ...
0
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1answer
62 views

Sleep vs low frequency

Some processors have a low frequency mode for using in low power mode. For example MSP430 microcontroller can work in both Normal clock frequency 16M Hz Low clock frequency 32 kHz I am wondering if ...
18
votes
5answers
28k views

Best pattern for WFI (wait-for-interrupt) on Cortex (ARM) microcontrolers

I'm looking into developing battery-powered software using the EFM Gekko controllers (http://energymicro.com/) and would like the controller to be asleep whenever there's nothing useful for it to be ...
1
vote
0answers
143 views

how correctly disable wakeup pin in STM32f0?

We need to disable wake up pin in some time, during stm32f0 run. we have used HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1); but it doesn't work. Should we do ...
0
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0answers
46 views

Reduce wake-up noise on ARM CM3

I need some help exploring a solution. I have an ARM Cortex M3 MCU, which has low-power sleep mode implemented. Wake-up sources are any GPIO pin, or an RTC alarm. A terminal is connected to UART-0 ...
0
votes
2answers
2k views

AVR sleep interrupt with keypad

I'd like to wake up my AVR whenever any button on the keypad is pressed. I am using Keypad.h library and simple 4x4 keypad made of buttons connected straight to AVR digital pins. Keypad itself works ...
0
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0answers
1k views

STM32 L0 wake from STOP mode with WAKEUP pin

I am attempting to wake an STM32L073RZ from stop mode using WAKEUP_PIN_1. I'm running MbedOS 5.11. Unfortunately throughout all of the documentation (Mbed/STM) I ...
0
votes
1answer
193 views

Reset MCU with a 1-0 button

I am working on a silabs C8051 MCU. It has a sleep mode which should be woken up by a reset. The mcu should start working (wake up from sleep) when the button in connected to Ground (Otherwise it is ...
2
votes
1answer
637 views

Low power sleep with WDT wakeup on PIC32MM

I'm trying to put a PIC32MM0256GPM028 into sleep mode and have it woken up by the Sleep Mode Watchdog Timer (say 1/4 second later- adjustable by SWDTPS anyway). Once it goes to sleep (current drops), ...
0
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3answers
145 views

Interrupt debouncer for switch sensor

I want to read the state of a switch sensor (magnetic contact). I'm thinking to connect the switch between an interrupt pin of my micro and ground, listening for CHANGE status. In this way I have ...
0
votes
1answer
997 views

STM32 External Interrupt via GPIO cannot be triggered after waking up from STOP mode

I have a problem with a project based on an STM32L051. I want to use the stop mode and wake up on an external (GPIO based) IRQ. This all works great but after the MCU woke up once, no IRQs seem to ...
4
votes
1answer
6k views

Entering stop mode on STM32L011 only works first time

I have a very typical application here - long periods of minimal current consumption (15 minutes to 24 hours sleep duration) with short periods of activity in between. In my particular case, this is ...
2
votes
0answers
260 views

ESP8266 sleep current is higher than it should be [closed]

In short: Despite setting my datalogger IMU to SLEEP and going to deepSleep(0) on the ESP without any other IC peripherals besides the buck converter and 2 deactivated LEDs, I still measure 2.5mA ...
0
votes
1answer
98 views

Putting the CC2541 to sleep

I have a bluetooth module which uses the CC2541 IC. My project is battery powered and so i want to be able to put the device to sleep.i have been looking about trying to find how to do this and it ...
0
votes
3answers
563 views

Low power switch input with MCU wake-from-sleep interrupt?

Im trying to read the falling edge of digital logic input to wake up a microcontroller. Below is the circuit I have used. There is an RC filter to provide a ~5ms debounce time, and a 100K pullup so ...
2
votes
3answers
1k views

How to wake up ESP8266 with light change?

I want to send information to the server when the light changes (turns on or turns off). As for now, I have a photoresistor connected to ESP8266's ADC pin. I'm measuring voltage and sends information ...
3
votes
3answers
9k views

How to make XBee sleep?

Arduino Fio with XBee radio. I have read the XBee manual (pg. 24-25), trying to figure out how to put it to sleep, but what I tried did not work. Then I found an example sketch using XBee sleeping, ...
0
votes
1answer
90 views

Single Button Power Switch and Mode Selector

I am currently creating an embedded project and would like to know what you all think is the best way to proceed. My setup at its most basic is an ATMEGA328P, a simple momentary pushbutton, a ...
1
vote
1answer
219 views

Is it the right use of the RTC RV8523 to wake up an atmega328p?

I'm using the RV8523 to wake up every 2 minutes an arduino atmega328p. The rtc is wired like this : Where INT1 is wired to Port D pin 3. The internal pull up resistor is activated and yet it's ...
1
vote
2answers
4k views

Use a RTC to wake up an ESP8266

I'm designing an alarm clock with an ESP8266 (Nodemcu) and a RTC module (DS3231). My system doesn't have any battery, it will be constantly powered through USB. I'd like to keep my ESP866 in deepsleep ...
0
votes
1answer
82 views

Switch low-level to high-level signal

I don't think that there is an easy (or even any) solution to this, but maybe somebody can help me: I got a GPS module connected to another MCU. The GPS module works on its own and should wake up the ...