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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Ultra low power battery

I am currently in the middle of a project and I am quite unsure of what type of battery and battery charger I should be using. To be honest I have never worked with battery or battery charger yet. In ...
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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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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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92 views

Powering down parts of a pcb to conserve power, is it possible? Any caveats?

I'm building a USB 2.0 bus-powered STM32F429-based audio device that is able to run in a stand-alone mode from a phone charger, or running as a USB device when connected to a computer. To comply with ...
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196 views

Low power circuit design

I want to design a low power circuit with stm32l micro and LoRa Module as its radio to send a sensor data to a gateway. The circuit is powered with a non rechargeable battery. My problem is about its ...
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620 views

USART on STM32F411 reads junk after MCU wakes up from STOP mode

I am working on a board that uses an STM32F411 connected to a bluetooth module over USART. One of the goals is to enable Low-power consumption in STOP mode. A brief summary of the platform: The ...
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131 views

Lowest energy wireless protocol for specific wireless sensor node

There are so many options for low-power wireless communication these days. BLE is everywhere, and many other manufacturers try to push their protocols as well. LoRa, Dust, Zigbee, Thread, Sigfox, etc.,...
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112 views

Low Current Consuption on a Voltage Inverter

I'm working with a uC and a Bluetooth Module. I need the lowest current consumption in this project because it is intended to be a mobile device. Thus, I'm using sleep modes on the uC. Now, I've ...
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1answer
205 views

RF limiter for -20dbm

I am working on a receiver in which I would like to limit the RF power at input to -10dBm to -20dBm, the receiver is working for frequency 1GHz. I Have checked pin diode limiters and shottkey diode ...
2
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1answer
329 views

Bipolar energy harvesting circuit

I'm planning an energy harvesting circuit using LTC3105 (400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up). The problem is that my energy source is bipolar, although ...
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1answer
580 views

Shut down circuit sections

I am currently devising ways to shut off different circuit sections in an embedded circuit. Here is a breakdown of what I am doing and my initial idea. Currently I have a micro controller which is ...
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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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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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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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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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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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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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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
65 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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83 views

Measure low AC Power consumption (oscilloscope? MCU?)

I would like to measure AC power consumption of devices such as AC/DC charger, AC LED bulb or an electric circuit in the main box of a house. However, their power consumption are quite low and the ...
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55 views

Help required to design a suitable energy harvester for TENG

So I am in the process of desgining a scalable Triboelectric Nanogenerator(TENG) through which I can easily harvest and store electricity in a battery or a capacitor. A TENG can be modelled as voltage ...
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72 views

Make a double-tapping button (ideally without ICs or keeping ICs to a minimum) for a small “tiny cell” powered device

Conditions: small device, extremely space constrained (large caps are a no-go) Powered by a small battery (something like under 120 mah) Thus, adding a few more ICs like the 555 or "TimeBlox ...
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503 views

Controlling Wemos D1 power with N-Channel MOSFET

I am trying to implement something similar to this: https://youtu.be/nbMfb0dIvYc?t=4m27s Basically, the idea is that the microcontroller (a Wemos D1 Mini in my case) is powered up by an external ...
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57 views

Running following circuit in under 18mA and 15-20V.

So i build above circuit to drive a high frequency transformer that have Primary 10 Turns, Feedback 8 Turns, and Secondary winding of 1350 turns.It works great for my application with 7V input and ...
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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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556 views

Is it okay to connect Supercapacitors as input to Step-up voltage regulator?

I want to use the maximum energy of the supercapacitor for 3.3 powered circuits. Thus, I thought of using step-up voltage regulator like this Can I do this? What are the other suggestions?
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1k views

Use 2 RTC Alarm on STM32L073RZ

I'm trying to configure two different alarms on my STM32L073RZ with the given example by StMicroelectronics. The problem is, when I try something like the script below, only the first Alarm turned on ...
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152 views

Latch-up and ESD protection for power supply and RS-422

I am designing a power supply board that has a switching regulator and four LDOs. Now, I understand that layout details or practices will help reduce switching noise from corrupting the ground and so ...
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4k views

STM32F030 RTC wakeup from stop mode

I'm writing an app, that most of its time will spend in STOP or STANDBY mode (battery powered microsystem). I'd like the internal RTC to wakeup my STM32 every 5 minutes, enter the ISR, do its tasks in ...
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1answer
76 views

psIsolation Transformer DC 12 volts

I want to use 12 volts DC and step it up to 400 volts AC or higher at 100khz. I am buiding a signal generator that outputs a sine wave or square wave with an adjustable frequency of up to 100 kHz. I ...
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1answer
17 views

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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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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1answer
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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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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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
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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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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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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46 views

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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53 views

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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33 views

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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2answers
84 views

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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46 views

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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66 views

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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38 views

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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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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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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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 ...