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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86 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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19 views

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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2answers
141 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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9 views

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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3answers
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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53 views

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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1answer
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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1answer
218 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
93 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
95 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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32 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
143 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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6answers
551 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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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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26 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
98 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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76 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
59 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
95 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
219 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
88 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
169 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
109 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
62 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
36 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
181 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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202 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
117 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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52 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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42 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
118 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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33 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
185 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
343 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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33 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
61 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
88 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
78 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
78 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
38 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
210 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
155 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
67 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
60 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
93 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
147 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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2answers
449 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
58 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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