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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.

2
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0answers
54 views

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

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
votes
1answer
58 views

Low-Power over USB

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 ...
0
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0answers
28 views

Ultra Low Power BLE Device w/ GPIO [on hold]

Here is my use case: I have a battery powered Raspberry Pi reading a couple of sensors that I want to turn on when I walk near it (within a couple hundred feet) and turn off when I walk away. I want ...
0
votes
1answer
38 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 ...
1
vote
3answers
60 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 ...
0
votes
2answers
48 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 ...
2
votes
3answers
124 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 ...
-1
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0answers
39 views

What type of power connector is this (found in NOMA Christmas light string)?

I found this connectors in many LED Christmas light connector (especially from NOMA). It seems to water tight once cap is screwed in. What is this connector called? I would like to buy more to inter-...
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0answers
26 views

Programming ATtiny 85 on a PCB and powering it

I am putting together a 7x4 cm PCB that has an OLED display driven by Tttiny 85 as a small project of mine. The display just outputs the text that ATtiny tells it to, the whole thing is designed to be ...
0
votes
1answer
78 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 ...
0
votes
1answer
64 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 ...
1
vote
0answers
33 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 ...
0
votes
1answer
87 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 ...
0
votes
1answer
37 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: ...
3
votes
4answers
225 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 ...
0
votes
1answer
64 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), ...
-1
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0answers
36 views

How does the supplied power work in a standard pc microphone audio jack?

I know every soundcard supplies some voltage through the microphone jack, usually between 2-5V. On the web there is some information saying that on a TRS jack the bias is supplied through the ring and ...
1
vote
1answer
82 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. ...
9
votes
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 ...
2
votes
2answers
99 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 ...
24
votes
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 ...
1
vote
1answer
46 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 ...
13
votes
9answers
3k 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 ...
1
vote
0answers
67 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 ...
0
votes
1answer
90 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 ...
0
votes
1answer
76 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. ...
0
votes
1answer
35 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 ...
1
vote
1answer
93 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'...
1
vote
3answers
145 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 ...
0
votes
1answer
38 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 ...
0
votes
0answers
171 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
votes
2answers
126 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 ...
0
votes
2answers
67 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'...
0
votes
1answer
79 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 ...
0
votes
2answers
94 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 ...
0
votes
3answers
153 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 ...
0
votes
1answer
53 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 ...
1
vote
2answers
88 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 ...
0
votes
2answers
65 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 ...
-1
votes
1answer
68 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. ...
0
votes
1answer
46 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 ...
1
vote
2answers
114 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 ...
2
votes
3answers
628 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 ...
0
votes
3answers
159 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 ...
0
votes
1answer
36 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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votes
0answers
37 views

Power distribution for low power application in a tight package for wearable

I'm looking for a component that will allow me to switch on/off the supply power to my onboard peripherals. I have a design that requires the peripherals to be powered only when they are in use to ...
0
votes
2answers
144 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 ...
0
votes
1answer
114 views

Power multiplexing with low leakage current for low power applications

I have a scenario in which one of two power sources is selected by a power multiplexing: One solution is to use already existing mux ICs like TPS2115A. The problem is that the leakage of these ICs ...
0
votes
0answers
114 views

Low voltage cutoff circuit with PV panel

I'm trying to build a simple reliable low voltage cutoff circuit and sufficient voltage turn on circuit for a PV panel powered circuit. The idea was to supply power from PV panel to a working circuit ...
0
votes
2answers
69 views

Current measurement in a SoC

I have to measure the current flowing inside a SoC through a multimeter. In the board schematics, I found that the SoC provides a structure to measure the current: Now, I should connect them with a ...