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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.

3
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5answers
211 views

Diode type with lowest drop voltage [duplicate]

I make a small solar energy harvester. I'm searching for the type of diode with lowest drop voltage. Any suggestion for the type of diode for me ? Thank you
0
votes
1answer
25 views

Mosfet or bjt choice for low voltage joule thief application

I make solar energy harvester using joule thief circuit with a small solar cell as the input. The output voltage from the solar cell is 0,5V. But the generic transistor, exactly silicon material need ...
0
votes
0answers
135 views

Could i get some circuit design feedback?

I have a computer science background and this is the first circuit I've ever designed. It is a lot of fun designing these circuits, but it also always feels like I'm missing a lot of "obvious" common ...
2
votes
1answer
31 views

Measure power usage of battery powered device

I'm a software engineer by trade so I'm a bit at a loss. Maybe I don't know the correct words to find what I'm looking for. I have a Bluetooth Low Energy remote control powered by two AAA batteries. ...
0
votes
2answers
77 views

Turn on microcontroller by sensor, auto power off - how?

To minimize battery power consumption I want the microcontroller only to be powered when a sensor's output is high. After the microcontroller finishes a task, it should cut its power off again. I ...
1
vote
2answers
70 views

Diodes - minimum forward conduction current

I've been working on a GPS tracker which is intended to run/idle on a battery for an extended length of time (2+ years). The tracker uses an accelerometer (LIS3DH) and remains in a sleep state until ...
-4
votes
2answers
67 views

I want to boost 0.45V and 0.6mA to 0.7V and 3mA suggest me a circuit which can do that [closed]

I'm doing a project that basically transfer the power from a laser and light up an led using it. The power output we are getting from the laser is at most 0.45V and 0.6mA (we used photodiode to ...
0
votes
1answer
30 views

Increasing TPS63001 Under Voltage lockout from 1.8V to 2.5V for use with LiFePO4 cell

The Under Voltage Lockout threshold for this chip ranges from 1.5 V to 1.8 V. I want to use this with a LiFePO4 cell, whose minimum voltage is 2.5 V. With reference to the datasheet here, the VINA ...
-1
votes
1answer
61 views

Switching 1875 Volts through a relay

I am trying to create an electroadhesive device that I can switch on and off easily, however, after using one relay that worked beautifully to do this function, I went out and bought a 4 channel relay ...
0
votes
0answers
42 views

How to reach ultra low power on STM32Lxx?

I'm having some problem reaching the said ultra-low power available for the STM32Lxx series. With no active register, the UC should consume around 10 uA, but I can't get it down from 1 mA. The ...
0
votes
0answers
13 views

Are components in PSOC 5lp powered off automaticaly?

I was reading an article about saving power in PSOC 5 (here) and its says it's a good practice to power off the unused components, but my question is: if I don't have a component block in my project, ...
0
votes
3answers
71 views

Ultra-low power sound/audio sensor for LOUD noises

I'm searching for a sound/audio sensor with ultra-low power consumption to detect the presence of a really loud noise (100dB+). The controller runs on battery and there is no option for a different ...
-2
votes
2answers
57 views

what is the right power supply switch for a sensor?

i'm trying to control my sensors power supply to reduce the current consumption of my project. i'm using ATmega328p that collect information from different sensors (digital and analog sensor) and send ...
-1
votes
1answer
35 views

How does Flash*Freeze reduce power consumption in Microsemi FPGAs?

Microsemi FPGAs are marketed as being low power. They have this flash freeze mode that is supposed to achieve much lower power dissipation, down to micro watts. I am trying to understand how exactly ...
0
votes
1answer
89 views

Where do I place the on/off switch in a multi voltage circuit?

I've got a simple Arduino setup where I need to supply a 3.3V Arduino with adequate power - and at the same time provide higher voltage to a sensor which needs 5V. The Arduino is powered by bypassing ...
1
vote
1answer
102 views

DC Current Measurement (resolution of ~ 1 uA)

I haven't worked with electronics in a long time, and now have the task of measuring the power consumption of a low-power device I'm writing firmware for... When the device is drawing very little ...
7
votes
4answers
896 views

What's causing this power spike in STM32 low power mode

I'm using an STM32L073RZ on a bare board with just the CPU and decoupling caps. I'm powering the board straight from an Otii Arc and measuring current consumption. I'm running MbedOS 5.11.2. When I ...
4
votes
3answers
378 views

How to debug current consumption with STM32 Nucleo board?

I'm trying to configure an STM32L011-Nucleo developement board to consume about 600 uA of current or so. It uses an STM32L011K4. The datasheet states that this should be possible if I drive the MCU ...
2
votes
3answers
88 views

Power small microcontroller from motherboard RJ45 ethernet port

I'm wondering if it's possible to power a microcontroller (e.g. ATmega328) from a Ethernet RJ45 motherboard port. Unlike USB, there is no power line, all pins/lines seem to be data only. I am ...
0
votes
0answers
131 views

STM32 L0 wake from STOP mode with WAKEUP pin

I am attempting to wake an STM32L073RZ from stop mode using WAKEUP_PIN_1. I'm running MbedOS 5.11. Unfortunately throughout all of the documentation (Mbed/STM) I ...
0
votes
0answers
32 views

Data communication in power harvesting project

I want to design a wearable gadget for elderly to detect falling. This gadget should work by energy harvesting. Now I want to find the best effitient way of power consumtion to send data to a station ...
1
vote
1answer
40 views

Low power device with high current peak

I'm creating power supply for controller that usually operates with very low power consumption, but sometimes needs high power. To make the situation harder there is "sometimes" external power present ...
0
votes
1answer
48 views

Harvest energy from ultra low current and high voltage source?

I have a sensor which can produce voltage upto 10 V but can only produce 50 nA of current. I tried to harvest energy using TI's BQ25570 evaluation board but the current is too low to kickstart the ...
0
votes
0answers
35 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 ...
1
vote
2answers
102 views

MSP430FR5994 SVSH Interrupt from LPMx.5

Background: I plan to use lpmx.5 under cap power but need a way to save the rtc registers to FRAM when the super-cap runs down. Plan: Use SYSRSTIV SVSH interrupt to wake up and save the counter, or ...
3
votes
1answer
109 views

Lithium thionyl chloride for GSM application

I'm trying o use a LiSoCl2 battery in a low power GSM application. When the system is in standby only the microcontroller(MSP430) is powered(3.3v) and the GSM(5v) and sensor(5v) is turned off. The ...
1
vote
0answers
59 views

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 ...
3
votes
2answers
93 views

Can transformerless power supplies be UL/CSA certified and is there any specific standard they must meet?

I am trying to bias a linear optocoupler on the AC mains side of a circuit, in order to transfer analog information to the secondary side of the circuit. I have designed the following capacitive power ...
0
votes
0answers
50 views

Ultra Low Power, LDO Enable from RTC vs. deep sleep MCU interupt

I have a question regarding optimising design for ultra low power consumption device. I'm trying to develop a remote sensor node that should measure and send data every few hours. Currently I have an ...
0
votes
2answers
77 views

Low idle power consumption for USB PSU

I'm trying to find out how "good" 5V power adapters can be with respect to power consumption if: there's no attached power consumer, and/or the consumer takes very little power, such as an ESP32 in ...
1
vote
0answers
51 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 ...
0
votes
0answers
65 views

ESP8266-01S OFF State (CH_PD at LOW) Draining too much current

I have this project in which the life of the battery is imperative, after various designs i came up with this one: As you can see the pushbutton labeled START puts the CH_PD pin on HIGH for a brief ...
0
votes
1answer
71 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 ...
0
votes
3answers
82 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 ...
2
votes
2answers
102 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 ...
0
votes
2answers
76 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 ...
1
vote
1answer
53 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 '...
2
votes
1answer
93 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 + ...
2
votes
1answer
62 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 ...
0
votes
2answers
148 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 ...
2
votes
0answers
68 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
votes
1answer
71 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 ...
0
votes
1answer
53 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
79 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
74 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
168 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 ...
0
votes
1answer
157 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 ...
1
vote
3answers
120 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
43 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
126 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 ...