"low-power" refers to components and circuits which are designed to have a lower power consumption than their common counterparts. This is most often a requirement because of limited available power, as in battery operated devices.

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51 views

Controlling power via code?

I have a lithium battery connected to a 0.33 amp / 12V pump via a connector (which can be changed - this connector option is part of the question). Is it possible to control power to the pump via code ...
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2answers
58 views

Is there a component like terminal block that would allow you to create a power rail?

I'm after supplying 5v to a bunch (5) devices from a single 5v power supply (with sufficient power output). I'm wondering, is there something like a terminal block, but instead of being pairs of ...
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0answers
17 views

Power calculation of cmos dram cell

I want to calculate power dissipiation of a 3T DRAM cell.how to give power command in s edit in tanner 15?also i want the power graph and the value...how can i obtained. What type of sourse instances ...
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2answers
65 views

Arduino digital input - Read voltage slightly higher then 5V - a power efficient solution [duplicate]

I need my Arduino to detect the state changes in a device - (ON or OFF). In order do do this, I have to check the voltage between two points on the PCB of the device. When the device is OFF, the ...
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2answers
104 views

Help in the design of a super low power device

I'm building a wireless device that have to last with batteries as long as posible. The device has an rf module with a microncontroller that manages the control, that part is bought and works fine. ...
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1answer
37 views

How do I make a default on circuit the can latch off until a interrupt goes low?

I am trying to design a datalogger that should run for a long time on one set of batteries. I have a RTC module that has a interrupt wire that is high when powered on and goes low when a alarm time ...
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1answer
202 views

Programmatically turn on PIR device with Arduino

I have a D203S PIR sensor operated device. I want to simulate motion detection with my Arduino and then let the device operate as normal. I have seen that shorting the PIR sensor for a couple of ...
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2answers
91 views

is a uA current FET or BJT circuit design possible?

I'm working on a battery powered circuit that is triggering an interrupt on an ic with an internal pull-up. The resistor value and normally closed switch can not be changed. The quiescent current is ...
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0answers
27 views

mixing parasitic powered 1-wire devices with others which are not. All in a star topology

I'm designing a 1-wire network with star topology. Number of branches will be 4 - 6. Each branch will connect two devices. One temperature sensor and one PIO-device 5 V will be supplied to the ...
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2answers
567 views

How to get 3.3V from 2 AA batteries? [duplicate]

I would like to know if its possible to 'step up' the voltage from two AA batteries (3V for Alkaline and 2.4V for NiMH) to a stable 3.3V ? I need to find a good power source for a circuit that I'm ...
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2answers
150 views

Eliminating micro current flow

I've built a RAM expansion cartridge for my VIC-20 computer. It uses the CY62256L 32KB SRAM chip. It has been working fine except there's a quirk. If I power off the computer, but leave the ...
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1answer
66 views

Should I use a regulator to improve efficiency or safety

I am considering a low power design where I do not use a regulator. The components will operate from 1.9 to 3.7 Volts. The design is powered from two primary cells(Nominal Voltage: 1.5 Volts ...
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39 views

Low power reliable motion state sensor for car

I am looking for a sensor to reliably determine the state of motion of a car (passenger, van, forklift, tractor). I will not disclose the nature of the project at this time but a similar sensor ...
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2answers
143 views

Can I use a transistor to switch to battery backup power when main power goes out?

I am putting together a circuitry, and I want the circuit to continue running even after main power goes out. So I was thinking about this idea of using a PNP transistor and a one-way diode to ...
0
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1answer
77 views

How to restrain this soft latching power switch from eating too much current?

I am designing a two buttons soft latching power switch for a project involving a raspberry pi, li-ion cells I salvaged from the battery of a broken laptop, and a power booster from adafruit. I ...
0
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1answer
49 views

How does this step up oscillator actually work?

I watched a Dave jones video on an energy harvester but I'm trying to figure out how the front end of this circuit actually resonates and how that steps up some small input voltage. Is it a function ...
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0answers
31 views

Ultrasonic transducer driver/receiver ultralow power issues

I'm looking how to easily drive ultrasonic transducer Prowave 500MB120 or similar from MSP430. I found TI: Ultrasonic Distance Measurement With the MSP430 and AnalogDevices-Ultrasonic Distance ...
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2answers
80 views

Detect power supply voltage threshold, while consuming very low current

Lead acid batteries get damaged by over-discharge somewhat like lithium polymer batteries. I need a circuit that will cut off the load from the battery when it drops below about 10v. That is the easy ...
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3answers
2k views

Why are vias bad?

I am designing a PCB with EAGLE and saw that it was trying to limit the amount of vias through the PCB. Why do you want less vias? Why are they bad? Do they bring extra manufacturing cost or is it ...
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1answer
38 views

When to use Battery Fuel gauge

I am designing a measuring instrument powered by a Li ion Cell, I need to display remaining battery capacity on it, so I was wondering what is good or lets say widely used method. Should I use full ...
0
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1answer
63 views

Mosfet to save power

I am making a battery powered project which involves bi-directional motor control. However motor needs to turn rarely (about 10-20 seconds in 24 hour period). I am using L298 motor driver. However the ...
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0answers
28 views

Send unique ID when powered (low-power)

I'm looking for a simple chip that simply sends its unique ID(eg.: number) when it powered. Thus it uses iPhone's line-out plug, I only have less than 1.5V. (Or 0.894V, I checked on Wikipedia, but I ...
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1answer
55 views

Diodes to drop voltage for RF module

I am making a standalone battery powered arduino project which uses nRF24L01+ for radio communication. nRF draws 20 mA current max. Can I use 3xAA cells along with 2 diodes (which drop 0.6*2 = 1.2 V) ...
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1answer
44 views

Non-diode OR-ing solution for n equivalent power sources

I wish to allow powering my circuit using at least one of 3 connectable periphals. For example, my application could have 3 usb ports that each connect to different usb hosts. Any combination with at ...
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2answers
109 views

12V Low battery indicator that has minimal power draw

I'm wanting to make a simple low battery indicator for 12V SLA battery - just an LED that lights when the voltage gets below a certain level. What sort of power would a circuit like this ...
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0answers
19 views

Ultra Low Power Capacitive Power On Switch

For a design, I like to build a capacitive power on/off button that I can power directly from battery. Ideally such solution should only consume nA level power and when person touches to turn on it ...
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1answer
48 views

Finding the Pull-up Resistor Value

I am designing a wireless sensor node that will be operating off of 1.8V. I am using an Atmel ATtiny861a MCU with a CC2520EMK radio and a 23A1024 External memory chip. I have a chip select pin for ...
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1answer
81 views

What benefits we have in reduction in clock cycles

If I implement a function with multiple algorithms but all providing same functionality and measure total number of clock cycles required to execute the program on a MCU platform, what benefits will ...
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2answers
67 views

Battery powered project with multiple voltages

I am working on a project which requires three different voltage levels - Motor that can run at 7-12 V. Hall sensor that can run at 5-25 V. nRF24L01+ that can run at 2-3.6 V and AVR (arduino) which ...
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2answers
109 views

Difference between Quiescent Current & Shutdown current?

What is the difference between Quiescent current & shut down current. I have searched a lot but didn't find valid answer. As per as my knowledge Quiescent current is the small current which flows ...
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4answers
140 views

Proper Way of Powering a Circuit with 2 AA Batteries [closed]

That is a real primitive question. a) Many MCUs and SOCs are able to work @3V (-/+ 0.3V) b) This is voltage of 2 AA (or AAA) batteries And the real question is: What is the legitimate way to ...
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0answers
60 views

Redundancy in power supply [closed]

How is redundancy of power supply from converters done in satellites? can anyone explain with complete details.Is it possible to get the actual design from power system of any mini-satellites ? Is the ...
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0answers
43 views

Complex system circuit design and simulation

I'm building a solar powered GPS tracking device using an Ieik Mini Nano V3.0 Atmega328p microcontroller board (based on Arduino Nano), Adafruit Fona GSM module, Ublox NEO-6M GPS module. The GPS ...
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1answer
269 views

How can I accurately estimate the power consumption of a GPS tracking device?

I'm building a solar powered GPS tracking device using an Ieik Mini Nano V3.0 Atmega328p Board (based on Arduino Nano), Adafruit Fona GSM module, Ublox GPS module. The GPS module will transmit ...
0
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1answer
65 views

Which end of a barrel connector is positive

I am having trouble understanding barrel connectors. From what I read online either the inside or the outside can be positive or negative depending on the direction of the current. SO which end is ...
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0answers
26 views

Qualcomm and phone power comsumptions

There are some links about qualcomm and phone power consumptions: http://www.notebookcheck.net/Qualcomm-Snapdragon-800-MSM8974-SoC.103706.0.html ...
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1answer
86 views

Can I dynamically change STM32 voltage during runtime

I'm using an STM32L151 MCU for a battery powered wireless sensor node. I came across the TPS6274x series switching regulator, who's voltage can be reconfigured at runtime by flipping it's inputs. The ...
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4answers
97 views

Use GPIO to disable voltage divider

I'm using a voltage divider to read the battery level of a wireless sensor platform using STM32L151. I'm shooting to use 20k for R1 and 10k for R2, to be under the 50k limit of the MCU's ADC ...
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1answer
124 views

MSP430 waking up every millisecond, what power usage to expect?

I have an MSP430 waking up every millisecond from a timer interrupt (to do a tiny amount of work, ie increment a counter and check a couple of input pins). It is set up to run at 25MHz. What should ...
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1answer
100 views

How to send the RC522 RFID reader into sleep mode?

I'm trying to get the power consumption of a MFRC522 RFID module down, currently while running it consumes about 4mA. There should be a way to put it into sleep mode, I just can't find any ...
2
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1answer
83 views

Measuring GameBoy power consumption

I am currently developing my own homebrew GameBoy game and I would like to try some tricks to reduce power consumption (for the sake of learning). The GameBoy has a HALT instruction that will stop ...
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2answers
156 views

Passive voltage drop from 6V DC to 5V DC for 3W circuit

I plan to put an Arduino onboard of my hub-generator powered bicycle circuitry. Currently, I have a circuit consisting of: 6V/3W AC hub generator (variable frequency and power); Rectifier bridge; ...
0
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1answer
40 views

low current buck converter

Just trying to find a suitable buck converter for my application, which is running off ~10-50V (12/24/48V battery banks) and supplying normally a very low load microcontroller (~1mA) but occasionally ...
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1answer
99 views

Loudest Piezo with low voltage and current?

I am making a board which will communicate wirelessly with a smart phone. When I send a specific command, I want it to sound an alarm to the user, making it able to be found when lost. I've got ...
0
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1answer
64 views

How do simple low power devices store setup when switched off?

I often come across battery powered items that store their state when switched off, particularly 'simple' items like LED bicycle lights (e.g. flash or solid light, changing each time it is switched ...
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1answer
55 views

Maintaining DC voltage with more batteries

I have a circuit which i am powering with two 1.5V AA batteries that dies at 2.6V volt as the battery discharges. Reading around, i realized that even though there is energy in the batteries, my ...
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1answer
47 views

Choose between Bluetooth Low Energy advertizing and connection for low-power small-data application

I have several sensors running on coin batteries, which are supposed to send data to a central device periodically. The data size is small: the meaningful data should be a few bytes excluding the BLE ...
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56 views

Low power design

I'm working on a project, it consist to collect data from sensor : HTU21D for humidity and Temp (digital I2C) LDR for light (Analog ADC) Potentiometer for adjustment (Analog ADC) communicate the ...
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1answer
57 views

MP3-25 flexible solar panel providing low current

I am working on a project where I need about 20 mA to come from a particular solar panel I am in possession of. The solar panel is an MP3-25 panel, I actually have 2 which I am trying to get to work. ...
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1answer
55 views

Role of Capacitors with additional power regulator

I have a a 7805 voltage regulator that has a capacitor on input and output. The 5v from that regulator is then elsewhere in the circuit stepped down to 3.3v with another regulator. I am wondering if ...