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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1answer
277 views

USB and coin cell battery switching

I'm trying to do a simple, low power, low cost power "switch" for a custom board (I know, it will be complicated). The device will be powered by default by a coin cell battery (3V3 and lower) and can ...
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3answers
102 views

74HC4060 lower frequency limit

I need to sequence some micropower (low-microamp range) logic at a once-per-several-minute rate, and am falling back on the good ol' 4060 as my timebase (plus a 138 and a 534 for the sequencing). I ...
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2answers
419 views

Very low current (<10 microamps) darkness detector circuit that turns off in light

I've made a device that lights an LED at a very low current (<10 microamps) as a very dim indicator for use in the dark. At its simplest, the circuit is a 3V coin battery + resistor (300K-1M ...
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2answers
187 views

Avoiding DC voltage drop for surveillance cameras over long distances

Trying to power 2 HD-TVI cameras 800 ft away from my home office. The wall mounted adapter provides 12v DC at 1 amp. I am looking for a good solution at the lowest possible cost. There are ...
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1answer
72 views

How to condition supply voltage for project

I am working on a circuit that is powered by a regulated 5V external power supply. However, since I will be directly powering a Micro-Controller from this 5v supply, I was wondering how I should '...
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1answer
286 views

ATSAMR21 sleep high current draw

I have an ATSAMR21B18-MZ210PA, which is an ATSAMR21E18 packaged with MX25L2006E flash. The SAMR21 is itself a SAMD21 paired with an AT86RF233 wireless module. So that's a SAMD21 + low power wireless + ...
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1answer
119 views

Reset pulse generated by UART break condition

I'm trying to create a reset pulse triggered by external inputs to my circuit. My circuit is connected to an external 5V supply and TTL level UART (actually a half-duplex single line). I would like ...
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2answers
475 views

Power consumption NeoPixels vs. direct control?

At Maker Faire Berlin 2018, an electrical engineer looked at my project which was shown with NeoPixel LEDs (WS2811). He mentioned that the NeoPixels waste a lot of energy. It would be better to build ...
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0answers
85 views

Arduino-like microcontroller with more ram for image processing [closed]

I want to build a device to perform image acquisition and processing, but I don't know which kind of board/microcontroller to use. My idea is to use a low-res camera, take a shot, analyze it and ...
2
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1answer
76 views

Low-Power over USB [closed]

I have a small custom 5V 2mA device which is powered over USB. To be specific, it will be powered over USB by connecting it to an Android smartphone or an iPhone. There is no data transfer. I ...
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1answer
133 views

How to safely connect USB to TTL (FTDI) adapter to device and also use bench power supply?

I'm trying to flash new firmware onto an ESP8266EX chip. The chip requires 3.3v and 80 mA (average). My USB to TTL programmer (FTDI chipset) can supply 3.3v but only at 50 mA. Here is what I'm ...
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3answers
274 views

digital current monitor/sensor for monitoring ~0.1 uA to mA current from a MCU and sensor [closed]

Hello I am in need of a current monitor/sensor like INA219 for monitoring current in the range of 0.1 uA to ~ mA. Kindly suggest a way to monitor current in such lower range. I have a microcontroller ...
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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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3answers
213 views

Driving a LED in the most energy efficient possible way [duplicate]

I got into a bit of a challenge with myself, just for the sake of learning something about low power stuff. I want to build a device that has basically two requirements: blink an LED every 5-10 ...
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1answer
410 views

Ver2.0 SDHC Card long response time after ACMD41 during initialization

I would like to implement a very low power SD card handling with MSP430 processors. I would like to log measurement data onto SD card without a file system. I want to turn on and off the SD card power ...
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3answers
689 views

Which is most used Barrel Connector ID? 2.1m or 2.5mm?

I'm working on an project which will be given to some friends and will be open-source too. I need to choose the power supply connector (5V or 12V @ 3A) and I'm thinking to barrel connectors. I found ...
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0answers
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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1answer
206 views

3W infrared LEDs not living up to 500mA-700mA - not even close

Here are the specs: Emitted Color: 850nm Forward Voltage (VF): 1.5-1.7V DC Forward Current (IF): 500-700mA Maximum Pulse Voltage: 2.2V List item But after hooking to power supply (which I first ...
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1answer
85 views

Deep power down mode in LPC17xx

I am currently working on a home project. I want to put my LPC1769 in deep power down mode. this is the code I have so far: ...
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4answers
3k views

Do voltage dividers waste battery?

I am attempting to make a battery powered alarm clock with an Arduino, and I would appreciate some help on the circuitry part. I am very inexperienced with electrical engineering. I am using a ...
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1answer
158 views

Low voltage LCD glass displays

I have a simple circuit I built using a 7-segment LCD glass display and an ATTiny (just a simple timer for now). I was hoping to use the setup in a low power, single coin cell device (3.3V - 2.7V), ...
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1answer
91 views

Simple way to create a disturbance on DC power

First of all, i must say that I am a software engineer, with very-low to no experience in circuits designs, and a very rudimentary understanding of electrical engineering and circuits. 101 really. ...
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1answer
1k views

Why does this microswitch datasheet specify a minimum load current? [duplicate]

The Omron VX series datasheet mentions on page 6 that "Using a model for ordinary loads to open or close the contact of a micro load circuit may result in faulty contact.", and shows that their micro ...
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2answers
810 views

Powering a circuit from either USB or LIPO

I have a small hobby project which includes MCU and some peripherals. It is powered by 3.3V power source and consumes 200mA-800mA for up to a minute. However, most of the time it's in deep sleep mode ...
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5answers
9k views

How could have Banksy kept an RF receiver running for 12 years? [closed]

I'm talking about Banksy's "Girl with balloon" painting that shredded itself at auction. I think the general consensus is that he didn't, and that it was set up before the auction (or a couple years ...
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1answer
51 views

How to wire together 3 power supplies for 3 different pd rails with the same reference 0v

How would I wire together 3 bench power supplies to get potential differences of +12, +24 and -6V, all with respect to the same 0V? All 3 of the bench power supplies have positive, negative and ground ...
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9answers
4k views

In which scenarios is it important to measure microampere?

With the situation of finding a new multimeter, I found myself lost to the number of available devices on the market. For sure, to find the most suitable device I have to set some requirements. While ...
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0answers
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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1answer
489 views

How to program STM32L011

I tried to program specific STM ultra-low power series (STM32L011D4-tssop14). JLink programmer doesn't support this type of STM32 MCUs. so I tried to program this MCU by STLINK-V2 (SW mode). to do ...
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1answer
88 views

Increased current consumption of micro-power devices

I've been working with microwatt and nanowatt power consumption devices for a while and I've mentioned that sometimes, due to unknown reason, current consumption increases in order of magnitude. ...
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1answer
58 views

Can I use Cat6 ethernet cable to connect switches to Fibaro binary sensors

The Fibaro binary sensor ( https://manuals.fibaro.com/binary-sensor ) is capable to handle two potential-free inputs and is powered by 9-30V DC. Can I use Cat6 ethernet cable from four double ...
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2answers
700 views

How to build a multi LED blink circuit triggered by vibration sensor?

I'm wondering how to build a module just like the ones that are in kids shoes that light up. I've taken a few of these out and would like to make my own circuit but I'm not sure if it is possible. I'...
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3answers
385 views

Add constant DC voltage to a variable DC input

I'm designing a PCB and I need a voltage rail, roughly 3 volts above the main input (of 3 - 30V). This rail is to power some CMOS devices, so it won't need to supply much current. Currently I plan on ...
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1answer
179 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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0answers
1k views

Using stop mode in freeRTOS on a STM32L0 and waking up using EXTI interrupt

I want to make a low power device, running freeRTOS. There are 3 threads, which I planned to suspend normally into stop mode and resume execution depending on an EXTI interrupts. I intended doing so ...
3
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2answers
205 views

Type of wire for high voltage applications

What kind of wire is most suitable for HV low-current applications, where the allowed maximum is 25 kV and 5 W? By type of wire I mean core and type of insulation. As far as I can guess, even if the ...
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2answers
96 views

Battery Life Estimation - Sanity check

I'm trying to estimate the battery life of my device and just need a sanity check since numbers I'm getting are wildly different depending on the method I use to calculate battery life. For brevity I'...
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1answer
365 views

Turning off external sensors with Arduino: MOSFET vs I/O pin

For a project, I made an environmental sensor system, consisting of an Arduino Pro Mini 5V (with ATmega328P microcontroller), a data logger module and three sensors. To save power between data logs I ...
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2answers
112 views

Cheap Low Power Signal Transmission To Smartphone

For my university project I'm making a certain sensor which has to (one-way) communicate with a smartphone. The sensor needs to be as cheap/simple as possible (aiming at +- €0,50 in total) and only ...
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3answers
527 views

Low power switch input with MCU wake-from-sleep interrupt?

Im trying to read the falling edge of digital logic input to wake up a microcontroller. Below is the circuit I have used. There is an RC filter to provide a ~5ms debounce time, and a 100K pullup so ...
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1answer
173 views

nRF52382 low power RTC data lost

Posting here, since Nordic DevZone is broken for me (Made a long post that didn't upload, just kept loading). I am currently approaching this from HW point of view (I personally not developing ...
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2answers
270 views

boost converter for ultra low power application

I want to design a dc-dc boost converter and manage power (MPPT) for an ultra-low power fuel which contains input voltage < 1 V and input current < 500 uA. if I choose simple boost converter, I ...
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2answers
68 views

Custom Tab-Shaped Plug

I'm designing a device that plugs into a base and am looking for clip-like part that will take a metal tab and transfer a small current (5V) to an LED in the device. The user should be able to pull ...
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1answer
110 views

9v battery voltage goes down very low when connected, but shoots back up when it is disconnected?

Whenever I leave a 9v battery connected to my circuit (simple circuit connected to a motion sensor) It goes down to about 3.3v, but when I disconnect it again, it will slowly go back up to about 8v. ...
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1answer
49 views

I have a 9v battery that is only needed to output power during night time/when the sun is down, how can i do this?

My main question is, am I able to use a solar panel to only allow power flow when it is dark outside?/When the Solar panel isn't receiving any light? What would the circuit for that look like? In the ...
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2answers
329 views

How to power a low voltage LED with a high voltage source?

I have a panel-mount LED (https://www.digikey.ca/products/en?keywords=A-LED8-1GAAS-PR7-1) that is described as "2.2V 30mA" and I would like to power it with a 28V DC source. My questions are as ...
3
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3answers
2k views

Low power amplifier for 433MHz wake up receiver

I’m designing a low power wakeup receiver (WuRx) circuit that will be used to wake up an Arduino and its 433 MHz transceiver, both of which pull way too much current (tens of milliamps) to keep ...
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3answers
389 views

Battery Tester Circuit with 3 LEDS

I'm designing a small system that uses an ATMEGA328P and a LoRa module that runs on 3.3V using a AAA 1.5V battery. The battery is connected to a Boost Converter which steps up the 1.5V to 3.3V to ...
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1answer
38 views

Adiabatic CMOS circuits in low power design

There are several techniques to reduce dynamic power consumption in low power design, but I could not understand the basic concepts of Adiabatic circuits and how will it reduce the dynamic power ...
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2answers
435 views

Driving a Common Anode RGB LED Using a uC

I have an RGB LED, APHF1608LSEEQBDZGKC, (Datasheet) which is common anode. The blue and green diodes both have a forward voltage of 2.65V while the red has a forward voltage of 1.8V. I want to ...

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