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.

Filter by
Sorted by
Tagged with
0
votes
1answer
47 views

Adding a transistor to cut the power makes automagically any device more power friendly?

I'm currently designing a device that will be powered by batteries, I'm planning to make the MCU sleep and only wake up a few times a day to read sensor values and go to sleep again, one of the ...
1
vote
2answers
37 views

IC Supply Current vs Temperature at low temperature

Background I am designing a low power device where every uA counts. It has a temperature range from -25C - 35C. In the datasheet for the 74AHC1G66; 74AHCT1G66, an analog switch I'm looking at, on ...
0
votes
0answers
25 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 '...
0
votes
0answers
37 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 ...
0
votes
3answers
31 views

Power Density parameter in Ultra Low Power (ULP) devices

I'm doing a bit of research on ULP processors. In a few papers (e.g. "Energy-Efficient Near-Threshold Parallel Computing: The PULPv2 Cluster") I found a figure of merit called "power density" and ...
-1
votes
0answers
27 views

What is my power duty cycle for my Memory IC

I would like to calculate the duty cycle for my flash memory. The sensors data are written to the flash memory as follows: sensor1 once every 5 seconds sensor2 once every 4 seconds sensor3 once every ...
0
votes
2answers
42 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 ...
0
votes
0answers
27 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: ...
3
votes
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 ...
1
vote
2answers
130 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 ...
0
votes
0answers
30 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 ...
0
votes
0answers
40 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 ...
0
votes
3answers
78 views

Low-power Linux-based ARM system on module for data logger? [closed]

I want to develop a data logger with several hardware characteristics (low-power consumption, SDI-12, I2C, SPI, UART, USB, Ethernet, touchscreen display, SD card, RTC, internal memory at least 128MB......
1
vote
1answer
169 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 ...
1
vote
0answers
17 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 ...
0
votes
2answers
44 views

Is it possible to set up multiple wake up interrupts on STM32. ? How to manage multiple sensor reading intervals?

I am new to developing applications on STM32 development boards. Currently i have STM32 IoT discovery kit. I am able to configure all the sensors and read data. I am interested in low power design ...
0
votes
0answers
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 ...
0
votes
3answers
101 views

Powering small DC load ( 1W ) using 220V AC supply

I am trying to design a small control circuit for controlling large currents (not too large, around 200W, AC 50Hz). I have kept in the AC circuit isolated from the DC control circuit. But the problem ...
2
votes
0answers
49 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 ...
0
votes
1answer
47 views

Gate-Souce resistors needed?

I completed an IR emitter circuit with two selectable power settings. It's working on the breadboard and I'm asking if I need the gate-source resistors for stability? As the circuit is battery powered ...
1
vote
6answers
409 views

Is there a way to make an LED blink using a passive circuit?

I am trying to make a simple flashing LED toy to get a 5-year-old boy interested in electronics. The LED should blink for the shortest time possible Remain off for several seconds between flashes The ...
4
votes
1answer
3k views

How to calculate Snubber for different load value

We are doing home automation project in that we need snubber for both resistive and inductive load. If we connect less than 5W load(Bulb) it is keep on glowing without switch on. Whether i need to ...
0
votes
1answer
108 views

STM32 standby mode power consumption is too high

I'm experimenting with standby mode on STM32F407VGT6. I know how to put MCU into standby mode(or I think to know that). I'm doing that with this init function: ...
0
votes
3answers
92 views

Long battery lifetime light? (LED etc.)

I design some plastic models, and I would like to include a small light (LED or similar). I am looking for a solution with a long battery lifetime. I'm not a electrical engineer but I read that, for ...
6
votes
4answers
2k 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
82 views

Do I need a buck converter?

I am planning to build a circuit with a bluetooth audio receiver (MH-M18) and an Arduino Nano, connected to a DIN connector. I have a wire with 12V supply readily available to connect to the circuit....
0
votes
0answers
27 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) ...
1
vote
2answers
125 views

Replacing an NE555 with a 74HC123D

I want to replace an NE555 with a 74HC123D in a battery powered device. It is used to clock a CD4017, for which I need a pulsed signal of 46Hz. I read that a 74HC123D needs less power than a 555. How ...
3
votes
1answer
276 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 (...
0
votes
1answer
219 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 ...
0
votes
1answer
162 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
1answer
33 views

NodeMCU v.1 / WEMOS Mini - Fail to Wake up from deep sleep

I'm Trying to put to deepsleep a Wemos mini/ NodeMCU / ESP-01, and facing the same problem - fail to wake up. Looking around - I've found some articles such this ...
0
votes
0answers
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 ...
0
votes
0answers
32 views

Estimating power consumption of GDDR5 chip from data sheet

I am trying to better understand the power consumption of this 8Gb Micron GDDR5 chip. Specifically, I want to estimate the following: idle—What is the power consumption when the chip is idling? max ...
0
votes
0answers
26 views

Alternate topping up two capacitor banks

I've implemented a Beam robotics 'solar engine' as detailed in the diagram below This engine takes a small trickle charge from the solar panel, before discharging the capacitor in one pulse of power. ...
0
votes
1answer
97 views

Whats the simplest heating surface for a DIY project

I'm trying to make a very small (3x3 cm or less) cup or surface that will heat to around 200C. The surface needs to be dry and I only care about heating the surface and not any particular volume of ...
0
votes
0answers
35 views

Piezoelectric Energy Harvesting & rectifying

I am interested in doing piezo energy harvesting. I have bought two of these piezoelectric Harvesters. One device I found, the ΒQ25570 seems to implement mppt (maximum Power point tracking), and be ...
0
votes
0answers
54 views

Latching relays connected in parallel not working as expected

I have a project I'm working on where I need 4 relays to open when power is applied to the board and close when power is lost. I need to use latching relays to conserve power as the device could be ...
0
votes
2answers
51 views

How does two way communication between a baseband modem (on a phone) and a mobile phone mast work?

I've been thinking absent-mindedly about how mobile phone communication works when I wondered how something as power efficient as a mobile phone can have such a powerful radio. I am guessing that most ...
2
votes
1answer
82 views

Switching device for ultra-low power sub-circuit

I'm looking for a switching device to be used for powering a sub-circuit in a battery powered low / ultra-low power circuit. It can be a MOSFET, or something similar but it need to have some special ...
0
votes
4answers
178 views

How do computers power so many lights on a keyboard?

Beginner here. I am working on building my own keyboard PCB, and I wanted to add a backlight for my keys. However, I've been reading methods of powering teensy little 3mm LEDs and it seems like an ...
0
votes
2answers
1k views

Voltage divider to measure 12v battery with arduino low consumption

I want to measure 12v. Car battery with arduino. Three questions: Is the R1 and R2 the best values? The car battery can go from +10v. To +15v. How and what can I use to save power between the ...
0
votes
1answer
75 views

Circuit to drive 3 LEDs that flicker independently

My basic requirement is that I need 3 higher-powered LEDs that flicker (like those little battery-operated candles you can get), powered from one power supply. The three LEDs should flicker ...
12
votes
4answers
33k views

Can I use multiple 18650 batteries in parallel with a standard MicroUSB 3.7V charger board?

There is this Bluetooth Audio Reciever/Amplifier board that I'm looking to get from ebay, and according to the diagram, there's a MicroUSB 3.7V lithium battery charger component in it. With my ...
2
votes
1answer
86 views

Measuring high voltage with low power op amp

I want to use AD623 instrumentation op amp to measure current at high side of the circuit: simulate this circuit – Schematic created using CircuitLab I was thinking to use a voltage divider ...
0
votes
1answer
109 views

Low power circuit that powers an LED but should not shock the human user

Need help making a circuit that requires very low current so that in case a human comes in contact he/she should not be shocked. Also a small buzzer or Led needs to powered through this circuit. The ...
0
votes
2answers
56 views

Very long PCB trace causing microcontroller to wakeup?

I have a design where I'm using an ESP32 as the device's main controller. The system is battery powered, so the ESP is in deep-sleep a lot. It can be woken up with a simple button push (detecting for ...
0
votes
2answers
162 views

What is the best way to acquire voltage information of a battery powered microcontroller project?

I would like to track the battery that supplies my microcontroller. I was thinking at a simple voltage divider bridge wired to an ADC input. As my divider bridge will be permanently connected, I ...
0
votes
0answers
86 views

Measuring micro-amps with INA series

I'm designing BLE devices and other low power embedded systems that can consume very low energy in the range of a few micro-amps. I can't afford any expensive precision multimeters. Hence, I'm trying ...
2
votes
2answers
100 views

Maximizing life-span when running MCU from a single battery using DC-DC converter?

I'm designing a device which will be off more than 99% of the time. The device is powered from a single AA battery through a DC-DC converter (has enable pin) and comes to life when a button is pressed....

1
2 3 4 5
14