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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84 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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3answers
90 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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1answer
76 views

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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26 views

Low power LiPo cell ADC with an nMOS switch and a resistor or capacitor divider circuit?

This is my first question on this platform and am looking for advice on doing a very low power LiPo battery measurement for a wearable device. My current circuit looks like this: (See image below) ...
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2answers
117 views

Replacing an NE555 with a 74HC123D

I want to replace an NE555 with a 74HC123D in a battery powered device. It is used to clock a CD4017, for which I need a pulsed signal of 46Hz. I read that a 74HC123D needs less power than a 555. How ...
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24 views

Low-power mcu with WiFi+BLE

I need a MCU with support of Wifi 2.4Ghz or 5Ghz and BLE 5.0. I know about ESP solutions, but, as far as I know, they're for beta testing and prototyping. But I need something stable and with low-...
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6answers
352 views

Is there a way to make an LED blink using a passive circuit?

I am trying to make a simple flashing LED toy to get a 5-year-old boy interested in electronics. The LED should blink for the shortest time possible Remain off for several seconds between flashes The ...
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43 views

Utilising patchy DC to charge a battery (from generator)

I am currently studying first year engineering at my college and would like some help with energy storage. Note that this is an industry project and not homework, so I am not breaking any rules. My ...
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31 views

Estimating power consumption of GDDR5 chip from data sheet

I am trying to better understand the power consumption of this 8Gb Micron GDDR5 chip. Specifically, I want to estimate the following: idle—What is the power consumption when the chip is idling? max ...
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0answers
25 views

Alternate topping up two capacitor banks

I've implemented a Beam robotics 'solar engine' as detailed in the diagram below This engine takes a small trickle charge from the solar panel, before discharging the capacitor in one pulse of power. ...
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1answer
97 views

Whats the simplest heating surface for a DIY project

I'm trying to make a very small (3x3 cm or less) cup or surface that will heat to around 200C. The surface needs to be dry and I only care about heating the surface and not any particular volume of ...
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53 views

Latching relays connected in parallel not working as expected

I have a project I'm working on where I need 4 relays to open when power is applied to the board and close when power is lost. I need to use latching relays to conserve power as the device could be ...
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2answers
47 views

How does two way communication between a baseband modem (on a phone) and a mobile phone mast work?

I've been thinking absent-mindedly about how mobile phone communication works when I wondered how something as power efficient as a mobile phone can have such a powerful radio. I am guessing that most ...
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1answer
73 views

Switching device for ultra-low power sub-circuit

I'm looking for a switching device to be used for powering a sub-circuit in a battery powered low / ultra-low power circuit. It can be a MOSFET, or something similar but it need to have some special ...
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4answers
174 views

How do computers power so many lights on a keyboard?

Beginner here. I am working on building my own keyboard PCB, and I wanted to add a backlight for my keys. However, I've been reading methods of powering teensy little 3mm LEDs and it seems like an ...
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1answer
72 views

Circuit to drive 3 LEDs that flicker independently

My basic requirement is that I need 3 higher-powered LEDs that flicker (like those little battery-operated candles you can get), powered from one power supply. The three LEDs should flicker ...
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1answer
67 views

Measuring high voltage with low power op amp

I want to use AD623 instrumentation op amp to measure current at high side of the circuit: simulate this circuit – Schematic created using CircuitLab I was thinking to use a voltage divider ...
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1answer
108 views

Low power circuit that powers an LED but should not shock the human user

Need help making a circuit that requires very low current so that in case a human comes in contact he/she should not be shocked. Also a small buzzer or Led needs to powered through this circuit. The ...
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2answers
54 views

Very long PCB trace causing microcontroller to wakeup?

I have a design where I'm using an ESP32 as the device's main controller. The system is battery powered, so the ESP is in deep-sleep a lot. It can be woken up with a simple button push (detecting for ...
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1answer
30 views

NodeMCU v.1 / WEMOS Mini - Fail to Wake up from deep sleep

I'm Trying to put to deepsleep a Wemos mini/ NodeMCU / ESP-01, and facing the same problem - fail to wake up. Looking around - I've found some articles such this ...
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2answers
155 views

What is the best way to acquire voltage information of a battery powered microcontroller project?

I would like to track the battery that supplies my microcontroller. I was thinking at a simple voltage divider bridge wired to an ADC input. As my divider bridge will be permanently connected, I ...
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73 views

Measuring micro-amps with INA series

I'm designing BLE devices and other low power embedded systems that can consume very low energy in the range of a few micro-amps. I can't afford any expensive precision multimeters. Hence, I'm trying ...
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2answers
97 views

Maximizing life-span when running MCU from a single battery using DC-DC converter?

I'm designing a device which will be off more than 99% of the time. The device is powered from a single AA battery through a DC-DC converter (has enable pin) and comes to life when a button is pressed....
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0answers
49 views

Powering crystal oscillator (not the uc's one) using one of microcontroller pins for power saving

I want to design a low power RF link using SI4463 and I just need to send data but when I was searching for a crystal oscillator found out that most of them consume about 2-5 mA current. Is it ...
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1answer
54 views

Electrical calculation

I'm need to calculate the how long it will take to charge a battery using a solar cell. I am not taking any charge curves into account, I just want to get a close answer before I run the experiment. I ...
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0answers
32 views

Piezoelectric Energy Harvesting & rectifying

I am interested in doing piezo energy harvesting. I have bought two of these piezoelectric Harvesters. One device I found, the ΒQ25570 seems to implement mppt (maximum Power point tracking), and be ...
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1answer
102 views

Choosing an appropriate voltage regulator to limit power consumption

I am new to the electronics world and trying to figure out how to choose the battery for the circuit. The circuit consists of an ATMega328P-PU, a DS2321 RTC and a PIR motion detector sensor. It needs ...
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0answers
29 views

Total Power Cutoff circuit

I'm designing a battery controlled circuit using a 555 timer to control a mosfet to provide power to a load. The problem I'm trying to solve is to reduce the current draw while the circuit is not ...
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0answers
72 views

Shutdown mode on stm32 consuming a lot of power

I am testing the demo code given in the directory STM32Cube\Repository\STM32Cube_FW_L4_V1.14.0\Projects\NUCLEO-L476RG\Examples\PWR for CubeMX. I am testing the code PWR_ModesSelection and am recording ...
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2answers
126 views

“Normally closed” switch: does it use more power than a “Normally open” for a low-power battery-powered ATtiny project?

I have a "normally closed" magnetic door sensor, that I'd like to use with an ATtiny microcontroller. Does a "normally closed" switch use more power than a "normally open" switch? i.e. since the ...
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0answers
28 views

Power management switch for Low-Power Application

In my low-power application I have a MCU waiting for an interrupt to wake up. (see picture) There are two sensor ICs (IC1, IC2) which consume very little and wake up the MCU via the interrupts. After ...
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1answer
55 views

STM32F4DISCOVERY high power consumption in Standby mode

I wrote an application for the STM32F4DISCOVERY development board (part number MB997C) which places the MCU into standby mode, and measured its power consumption through the JP1/Idd jumper using a ...
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1answer
70 views

get 100mA pulses from 20mA source to charge li-ion

I have only 20mA in my circuit and after trying to charge a battery with TP4056 it doesn't work. TP4056 is a linear charger so I need to try with LTC4002 or even better to improve efficiency. Anyway, ...
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2answers
50 views

Low Power Switching application With N-Mosfet

In my application I need to effectively switch on or off a very small load, around 0.5W to 1W. Also, I need to ensure that power loss is kept to a minimum. The voltage levels of my application will ...
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2answers
59 views

PWM signal to “real” analog signal with low load dependency

I am designing a circuit that allows me to regulate an Arduino PWM output to a stable voltage reference (PWM to 0-5V ideally) dependent on the duty cycle. So far my approach has been to attach a low ...
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0answers
26 views

Full charged battery age

I design a schematic for a alarm device. I use a trigger IC use 40nA and i want to use a 2500 mAh Li-Ion battery. The device is used at outdoor (-20/60 C) at least 2 year. I want to ask that a fully ...
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1answer
66 views

Is the parasite mode of a DS18B20 less power consuming than the normal mode?

Description I'm trying to make a few small temperature sensors for in our house and want to go for "low powered battery operation". My current plan is to use esp-now in the esp8266, deepsleep ...
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2answers
67 views

Alkaline battery performance at -30 Celsius

I am making an IoT project and planning to power it with alkaline batteries. Their safety and low cost are really appealing. Their low discharge capability is not a problem. The batteries need to be ...
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1answer
52 views

power consuption of internal 32kHz RC oscillator

I am looking for the typical power consumption of the OSCULP32K (Ultra Low Power Internal 32kHz RC Oscillator) of ATSAMC20J18A. Found nothing in family datasheet so far, only XOSC32K. Can I expect the ...
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0answers
56 views

Ultra low power but also wake on event?

I have a nodemcu that needs to turn on periodically (every 2 hours) to take measurements, send them to me and then go back to sleep. I need this to be able to last for at least a year on batteries, ...
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1answer
86 views

Need smaller pullups on i2c lines, but design is low power, what is best?

The pullups on my i2c lines are 4.7k. People are afraid of draining the battery by fixing this waveform with smaller pullups, like 2.2k. It doesn't seem much power is wasted considering the short ...
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1answer
57 views

Using a CMOS 555 as a window comparator

I've been working on a small project inspired by this question that uses a CMOS 555 timer as a power button controller (short press to turn on, 3s hold to turn off), the goal being to design a ...
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0answers
55 views

Looking for advice - DIY data transmission over DC power lines

Want to drive DC motor and read some data through one pair of wires. Modified and made a simulation of transciever based on this one: https://www.radiolocman.com/shem/schematics.html?di=148255. ...
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2answers
289 views

Using Supercapacitor Along With Battery [closed]

The circuit seen in an existing meter I am currently working on a smart meter solution(low power), where I am planning to add a supercapacitor to help the battery in supplying peak current surges ...
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1answer
50 views

Power-supply made of battery+solar cell, ultra low power

In various scientific calculators, we can see that they have "twin" power, basically a mixture of a solar cell and a battery. I would like someone to tell me what kind of circuit usually takes both ...
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1answer
236 views

Low Quiescent LDO vs. Buck Converter: Which is better for low power applications?

I'm stuck between choosing to use either a buck converter or a LDO voltage regulator for my heated glove project. The voltage regulator's function in question will be to power the microcontroller. ...
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1answer
57 views

Strange STM32L476RG GPIO behaviour when leaving STOP mode 2. Is it a silicon bug?

Before I enter the stop mode 2 I save all the GPIO MODER, OSPEEDR and PUDPR registers, configure pins as analogue (to save some power) and enter the STOP mode 2. When I exit the stop mode (I use RTC ...
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1answer
113 views

Advice on battery powered ESP32 with NFC Design

I'm new to PCB design (First one) and I want some advice and tips from more knowledgeable people in regard to basic design elements and especially the power consumption part. I want to make the ...
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3answers
62 views

Multiple rails I2C bus device from PMIC

I want to use a PMIC chip in my project. As any PMIC, it has a couple of outputs: buck Vout, and an LDO out. The PMIC is operated over the I2C bus. The MCU acts as the host device and runs on Vout, so ...
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1answer
45 views

MIC5216 Achieve minimum quiescent current draw

I have the MIC5216 as voltage regulator. I am regulating 2 18650 down to 5v in order to supply enough power to my circuit. I am using a 328p as MCU. The chip goes to sleep and is awoken again by an ...

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