Questions tagged [low-power]

Low-power refers to electronics that are designed to use less power than their common counterparts. This is often a requirement because of limited available power, as in battery operated devices, or in cases with limited cooling capabilities, as in notebooks.

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Essential difference between normal irda mode and low-power irda mode?

guys, I'm learning stm32f401x mcu. All I have is an rm0368 reference manual pdf file. No mcu chip right now. From the manual, I learnt that PSC instead of ...
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Isolation Circuit Question - How does this feedback work?

I am completely stumped. I have been troubleshooting this circuit for some time, and is what powers another circuit. The thing is, I have no idea how this thing works (not well as of late, due to ...
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Reducing power consumption of RF433 module

I'm trying to build a remotely-controlled switch using Atmega328p. For radio communication, I've chosen a generic RF433 transmitter/receiver combo, just like in this tutorial: https://...
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PCB low power self heating component separation

I am an EE that is fresh out of college and and starting at a smaller company, and I have a question about electronic self heating, and how to keep heat from spreading in a PCB to heat sensitive ...
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Supply current of Nanopower OpAmp

I'm using MCP6044 Quad OpAmp (Datasheet) for battery powered PIR sensor, it works fine but draws too much current. When I plug it to 3V source (VDD: 3V, VSS: GND) with no load it draws around 550uA, ...
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STM32 - How does analog configuration of MCU pins affect the power usage?

When I was creating a new project using the STM32CubeMX, I saw a check box stating that setting all free pins as anlog will decrease the power consumption. I couldn't figure out how it works. How can ...
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Ultra-low power energy harvesting wireless sensor network: technology and options

Background & Context I'm developing a project proposal for my honors thesis (officially commences at the end of July, running for one year) with the aim of designing a wireless sensor network with ...
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controller area network protocol, where does the software live?

The CAN protocol lives between the phy layer and the data link layer. It is a wired network protocol connecting electrical entities to allow communication. What I wonder is where each node is ...
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Reduce voltage before LDO

I am working on a remote gate opener setup. It will be powered via a 12v battery (12-13.5v) and charged via pwm solar charger at up to 14.5v. I would like to use the HT7333 LDO datasheet here It has a ...
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Drive a 12v indicator lamp/LED from AC mains

I want to switch a mains input on and off using a latching switch (which is appropriately rated). The switch supports illumination via a packaged LED, driven by 12V, either AC or DC. The current draw ...
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Making a super efficient line following robot that runs on super capacitors for as long as possible [closed]

I'm trying to make a line following robot that runs for at least 20 seconds on a 2F super capacitor (5x 2.7V 10F super capacitors in series with protection circuits.) So I'm working with 13.5V and 182 ...
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Energy Harvesting application capacitor selection

I have an energy harvesting application and I want to use a capacitor to store energy. Due to the application being very low power, a capacitor of around 50uF might be enough. What is really important ...
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Power Consumpion on i2c on esp32 on arduino framework

I am relatively inexperienced with electronics so be gentle please. I am trying to interface a VEML7700 photodiode sensor with a Firebeetle ESP32 using platform.io and arduino framework. The ...
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Powering a max 360 W Ender 3 Pro with a 300 W inverter

I’m planning on powering the Ender 3 with a 200 W solar panel with a 300 W inverter. I saw on some posts that the Ender 3 draws 500-ish watts whilst starting up but then drops to an average of 150 - ...
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How to estimate the peak power of BLE?

I am trying to determine my battery sizing for the NRF52840 BLE. To do so, I want to estimate the peak power. But I am struggling with this. Is it safe to go with transmit current as the peak ...
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How to drop the voltage slightly (~100mV) for a MCU mostly in deep sleep?

How to drop the voltage by a low value (let's say <150mV) without wasting current to supply a microcontroller that spend most of its time in deep sleep mode? I'm working on a board with a ...
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How does the input voltage affect the current consumption of a microcontroller?

Is there a relationship between the current used by a microcontroller unit (MCU) and its input voltage? In other words, given a MCU with a wide-input range (e.g. 2.7 to 5.5V for the ATmega328P), will ...
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Power mode and program stm32 device

I'm studying about STM32 low power modes, and after program the device with __Wfi instruction I cant program another firmware in the device, I tried to use the STM ...
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Is it safe to power a 3V 50mA device through a USB port?

I don’t know much about electronics and from what I read on an instructable it was doable. I’m basically trying to stop using AA batteries for my wireless keyboard and wondered if I could just solder ...
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Minimize power consumption IR receiver

I am designing an embedded system where I need to minimize power consumption in standby mode (ideally no additional consumption from the IR receiver circuit when in standby) This system will be ...
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90 views

Smallest 5V 2.5mA supply from 110VAC

I need the smallest power source possible to get 5V to power ATTINY402 and one 100K pullup and turn ON a MOSFET with a 2K resistor for 5 seconds once a day (to switch ON 1W LEDs run by a dedicated LED ...
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76 views

Powering a very low current application

In my application I want to give power to an ATmega328p and an MMA8451 accelerometer. When active, these devices require 5.2mA and 24uA respectively, and when in power saving mode, they require 4.20uA ...
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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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Low power consumption problem

I have a pressure sensor which is working in the feet of a person which senses the pressure. I'm using nRF processor for sending just ON/OFF signal to the motors. The problem is I'm using a battery ...
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What happens to step down converter effiency when current consumption is very low

I'm planning to use a MAX640 (Maxim 9 V -> 3.3 V Step-Down DC-DC Converter) to supply a couple of ICs with 3.3 V. In active mode the current consumption of the ICs are around 20 mA and according to ...
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Voltage regulator for ultra low power device

I am currently designing a battery powered IoT device, which maximum voltage is 3.3V. When it comes to battery choice, the CR2032 (3V) is totally fine, but its capacity is only 250mAh. How can I power ...
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Constant-current driving with LED Driver and Boost DC/DC converter

Novice here, sorry if I'm missing something obvious. I'm trying to drive 4 strips of 6 low-power RGB LEDs each (APF3236LSEEZGKQBKC) on a 3.3V battery. I have a 12-channel LED Driver (TLC6C5912) which ...
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3V Soft latching switch

I apologize if this has been asked before but the answers I found are all over the top for this simple latching application. I'm looking for a very compact solution: 1) 4.5 volt dc, 3 stacked hearing-...
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134 views

COVID-19 Human to Human 'Proximity' Logger

In the midst of the Corona Pandemic we are looking to develop a wearable sensor that when within approximately 2m of another (of the same type) of wearable sensor will log an event. The ideal would ...
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STM32F103C8T6 Standby mode consumption too high

I am facing a realy strange problem while trying to put my "bluepill" with stm32f103c8t6 onboard into a standby mode. The consumption in standby mode is .8mA (what is 40 times higher then its supposed ...
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PMIC for ESP32 project

I'm looking into improving an existing battery driven design with a PMIC chip. The device runs from a single LiPo cell, sleeps most of the time and wakes up every 20 minutes or so to update an ePaper ...
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Adding a transistor to cut the power makes automagically any device more power friendly?

I'm currently designing a device that will be powered by batteries, I'm planning to make the MCU sleep and only wake up a few times a day to read sensor values and go to sleep again, one of the ...
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IC Supply Current vs Temperature at low temperature

Background I am designing a low power device where every uA counts. It has a temperature range from -25C - 35C. In the datasheet for the 74AHC1G66; 74AHCT1G66, an analog switch I'm looking at, on ...
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UPF for low power design

I want to write simple UPF for doing power supply connection for the design. I have top level design (eg name TOP) having 6 different power supplies.I am not sure while defining domain how to use '...
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Power Density parameter in Ultra Low Power (ULP) devices

I'm doing a bit of research on ULP processors. In a few papers (e.g. "Energy-Efficient Near-Threshold Parallel Computing: The PULPv2 Cluster") I found a figure of merit called "power density" and ...
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Measuring nano amp range current consumption

I am looking to buy one of Joulescope, ZS-2102-A (angler circuits) or Otii (QOITech) to measure power consumption and get graphs of current consumption for some low power BLE/WIFI devices. Does any ...
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SAMD21G18 not working at 1.8V

I am working with a SAMD21G18 and a custom board based on Sparkfun design and I am using VSC + PlatformIO. Actually I want to run at 1.8V instead of 3.3V. Now, the hardware works well at 3.3V but ...
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Calculating power consumption of a digital temperature sensor

I want to calculate how much power does the TMP101 (https://media.ncd.io/sites/2/20170721134403/tmp101.pdf) consumes when it's operating. In the datasheet states the quiescent current in 3 cases: ...
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ATmega168 versions for low power applications

I am interested in using an ATmega168 for a simple application, which has however very strict power limitations. As a result, the important thing for me is to find the version with the least power ...
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92 views

What is wrong with my USB Li-Ion charging circuit?

I'm trying to design my own PCB based off of this one: My relevant schematics are here: Their Q3 transistor DMG3415U-7 was going obsolete, so I used DMP2045U-7, which seemed to be a similar ...
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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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Using an NO switch to close to ground as an interrupt

I'm designing a circuit that supplies power via USB to an Arudino. The USB power runs through a 3v3/5v dual regulator. I'd like to use a small tactile switch in front of the IN lead on the regulator ...
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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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Bluetooth Advertisements with multiple PHYs?

One thing I am confused about on Bluetooth 5. There are several different PHYs available on Bluetooth 5. My question is, can devices listen and/or send advertisements with multiple PHYs? What is ...
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103 views

Powering small DC load ( 1W ) using 220V AC supply

I am trying to design a small control circuit for controlling large currents (not too large, around 200W, AC 50Hz). I have kept in the AC circuit isolated from the DC control circuit. But the problem ...
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Discharge protection circuit for 2S Li-ion

I'm looking for a overdischarge protection circuit for two 18650 in series. Preferably not a module. Discharge current is max 1mA. Charging is done in a separate charger My situation is a circuit ...
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47 views

Gate-Souce resistors needed?

I completed an IR emitter circuit with two selectable power settings. It's working on the breadboard and I'm asking if I need the gate-source resistors for stability? As the circuit is battery powered ...
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171 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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92 views

Long battery lifetime light? (LED etc.)

I design some plastic models, and I would like to include a small light (LED or similar). I am looking for a solution with a long battery lifetime. I'm not a electrical engineer but I read that, for ...
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Do I need a buck converter?

I am planning to build a circuit with a bluetooth audio receiver (MH-M18) and an Arduino Nano, connected to a DIN connector. I have a wire with 12V supply readily available to connect to the circuit....

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