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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STM32F107 excess power consumption in STOP mode

Firstly, I want to say that there is no error on PCB because if I put MCU into standby, consumption is normal - around 5 uA. I have experience with stop mode on STM32L0, but STM32F1 got to my hand for ...
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61 views

Ultra-low Power DC DPDT Switch: Does It Exist?

I'm working on a circuit for an ultra-low power microcontroller and two configurations are given for RFO HP and LP to operate in low and high power modes respectively. I tracked down an application ...
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101 views

Limiting battery input current to avoid voltage drop when activating LoRa radio

I have a battery-powered wireless sensor system that sends sensor information periodically. One requirement is that it has to be functional at very low temperatures. Powering this system is a Tadiran ...
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31 views

Interfacing 3-5V power source with 3.3V SD-card

I'm trying to find a reliable way to connect my nRF52840 BLE-module to a 3.3V SD-card. The application is going to run on a lithium-ion battery and power is extremely budgeted. The nRF52840 module can ...
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44 views

Nano Power Soft Latch

I need to latch an INT output with a time width of 7 ms. This signal is generated by an RTC clock and I need to enable an LDO with it. The LDO powers an MCU, which at the end of its program should be ...
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6k views

How to Measure Power Consumption on Extremely Low Power Devices?

This might be old news in a half a decade or two but by today's means, I am referring to electronic prototypes and designs which would draw in a μA (uA) and even nA range of current. Some recent MCUs,...
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2answers
37 views

Power saving circuit in pneumatic valve

I am looking for a pneumatic valve and I refereed a catalog. It has a power saving circuit in the valve and there is a circuit diagram and description of that. I couldn't understand how this power ...
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21 views

Restarting ESP8266 NodeMCU in DeepSleep with a signal from HM10 BLE

I'm building a simple project in which I put the ESP8266 NodeMCU board in DeepSleep mode, so I can save some battery since it's powered with 4 AA batteries. What's the problem? I don't want my ESP to ...
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144 views

Power off detection circuit to close opened latching solenoid valve

The image above is referred from this SO link. My use case is the following: A latching solenoid valve, which would be run using 4 AA batteries (6V) Solenoid Valve (9 Ohm) operates at 6V under 40ms ...
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39 views

Voltage And Current Leak into My Electronics Design Prototype

I designed & build a circuit/PCB to control a 5V PWM PC fan on Autodesk Eagle. It's based off the Arduino Leonardo platform (ATMega32U4). The PCB is made by JLCPCB and I soldered on the components ...
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6answers
112 views

Low energy LEDs [closed]

What is the lowest energy LEDs (SMT) you know. I am browsing catalogues for days now and I thinking if there is anything on the market really low power. #edit I have about 10-15 LEDs on the board. All ...
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Are there general guidelines for LiPo discharge current?

I'm doing a hobby project where I'm designing a smart RC car around the size of a mini sim card. The BOM has been narrowed down, and I reckon it's doable with a 4-layer board. Image source: https://...
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35 views

Low power temperature monitoring

I'm trying to monitor the temperatures at various location inside and arround my house. So far, I used battery powered (18650 Li-Ion) ESP8266 chips with a DHT22 sensor. The ESP wakes up every 5 ...
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1answer
34 views

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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103 views

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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34 views

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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2answers
83 views

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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48 views

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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765 views

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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35 views

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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3answers
64 views

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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2answers
149 views

Energy harvesting circuit output inquiry

I am doing an energy harvesting circuit experiment (LTC3108 IC chip). There was an example in the LTspice program. I observed the current of Vout and it was 99nA as follows. The voltage was found to ...
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1answer
183 views

Pico-itx motherboard Powered With Battery

I want to built a portable pc system. I am interested in the Pico511 pico-itx motherboard. My concern is how to run a system like this on battery. It's using 12V and for the top configuration it ...
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2answers
47 views

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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1answer
106 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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82 views

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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1answer
45 views

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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1answer
51 views

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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2answers
176 views

Buck Boost Battery 3.6V (Lithium-thionyl Chloride) to 5V

I hope this question has not been asked and it's not as far as I have seen. I am developing an IoT project which uses almost no current (< 100uA) when sleeping and up to 80mA when running. The ...
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1answer
180 views

Li-Ion Battery Solar powered circuit

I am currently working on a Solar powered project but I am having a hard time making it work: I have a PCB with an Arduino and a sensor, this circuit consumes 250mA for around 2 seconds every 10 ...
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1answer
317 views

Ultra low power audio recorder

I'm trying to design an ultra low power audio recorder, in order to monitor ground noise in rural areas. The circuit I'm working on is based on a microcontroller (STM32L100RC) and an audio codec (...
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2answers
47 views

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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1answer
236 views

Separate power supply for ADXL362 (independent of MCU)

I am currently trying to connect an ADXL362 accelerometer to an ESP8266 and have them communicate through SPI. My final goal is to build a battery-powered device that submits motion events (activity ...
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33 views

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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2answers
78 views

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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3answers
52 views

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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1answer
59 views

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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1answer
62 views

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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1answer
84 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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3answers
100 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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1answer
40 views

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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3answers
78 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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0answers
28 views

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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2answers
41 views

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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1answer
51 views

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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60 views

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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2answers
33 views

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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1answer
336 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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1answer
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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4answers
1k views

Convert low power Alarm Clock from 120V 60Hz to 230V 50Hz

I recently bought a vintage flip-digit radio alarm clock from ebay, because I plan to refurbish it and basically use it for the rest of my life. However I only realized that the device must be ...

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