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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24 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. ...
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1answer
40 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 (...
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2answers
56 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 ...
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3answers
81 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......
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2answers
76 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 ...
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1answer
155 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. ...
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1answer
132 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: ...
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0answers
19 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 ...
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1answer
79 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 ...
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1answer
40 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 ...
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0answers
46 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 ...
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234 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 ...
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2answers
103 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 ...
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1answer
369 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 ...
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1answer
59 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 ...
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0answers
109 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 ...
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0answers
45 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 ...
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0answers
940 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 ...
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1answer
124 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 ...
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1answer
187 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 ...
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3answers
136 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 ...
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0answers
205 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 ...
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1answer
75 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 ...
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3answers
478 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
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1answer
534 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), ...
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1answer
84 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 ...
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1answer
190 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 ...
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1answer
75 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 ...
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0answers
161 views

MCU wakes up from sleep periodically

I'm facing a weird behavior on SOME boards based upon CC3220SF. Scenario I have 20 units of my custom PCB, designed following the Design Reference Guidelines from Texas Instruments and - like they ...
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1answer
927 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 ...
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5answers
5k 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 ...
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0answers
201 views

Pulse counting routine with sleep

I'm making a simple battery-powered project that measures water flow with a liquid flow meter and transmits the value with an nRF24L01+. The microcontroller I've chosen is a TI MSP430FR2110 (family ...
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3answers
167 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 ...
10
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1answer
876 views

Detect which momentary switch caused a STM32 cpu to wakeup

Edit: This question is wrong. The stm325105 has only one wakeup pin. But other ST-parts has more than one wakeup pin, so the given answer is valid for those. I have a stm32f105 that has two momentary ...
4
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1answer
439 views

ESP8266: Differentiate wakeup due to sleep interval vs button press

I have an ESP8266, ESP-12F modules that is in deep sleep mode. It wakes up every 6 hours to read the humidity sensor, display it on LED and then post to IFTTT. Because it is every 6 hours, it ...
2
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1answer
185 views

Logic shutdown for CMOS oscillator

I would like to add a !(SLEEP) line for this CMOS oscillator in a way that in case of low input on !(SLEEP) line, the output PWM line is constant low. 2 questions for the circuit: In this case do I ...
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4answers
5k 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 ...
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1answer
1k views

Wake up a PIC from sleep using Timer1 Interrupt

I tried to wake up a PIC (16F88) from sleep using Timer1 Interrupt with external crystal. But it doesn't work. I tested it using watch dog timer and it works. But I want to use Timer1 Interrupt. It ...
2
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0answers
420 views

SAM-D21 Clock On Demand does not wake up the MCU from Standby

I am using SAMD21 with FreeRTOS. I am putting the system on sleep level Standby and relying on a TC that works as a systick for the tickless FreeRtos to wake up the MCU however, when the debugger isn'...
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2answers
6k 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, ...
3
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0answers
305 views

Wait make the STM32L073RZ freeze in stopmode

With my STM32 I'm trying to configure a deepSleep mode and use RTC to generate interruption (actually each 30 seconds). When my STM start, this one configure the RTC and directly go in Stop mode. ...
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2answers
95 views

Short-term data storage in between wake cycles

I've been working on making a gardening system using an Arduino or an ESP32. To conserve energy, I will have the MCU sleep for long periods of time (I was planning on using pin-change interrupts to ...
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2answers
3k views

Arduino Atmega328 sleep mode with internal timer interrupt

I am trying to reduce the current consumption of my Atmega328 -Arduino- by using the sleep modes. In my code, I want to wake-up every 10ms, read the value from ADC, ...
2
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2answers
966 views

Ultrasonic sensor(ping) and deep sleep Arduino

Is it possible to use an ultrasonic sensor to wake up an Arduino which is in deep sleep when an object is detected within a few cm and then do stuff?
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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 ...
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1answer
74 views

How to get the “max” from two inputs?

Question: Is there any way that I can change the signals from two inputs into the max signal from those inputs? Such as, ...
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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 ...
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4answers
1k views

Can I wake ESP8266 with photoresistor like in this schematic?

I want to wake ESP8266 when the light turns on, send information to the server, go to deep-sleep for a few seconds and then send the information again and keep doing that. If the server stops ...
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2answers
614 views

Does a chip retain information in sleep mode?

I'm trying to write a long term timer function on an attiny85 and currently I'm using a counter. I'm experimenting using sleep mode as detailed here. I'm wondering if the chip "retains" information in ...
2
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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 ...