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Questions tagged [low-power]

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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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I am working with the STM32WL55CC (48-pin package). When I imported the official STM32CubeWL example projects from ST, I noticed that they provide both SINGLE CORE and DUAL CORE versions. But the ...
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I'm having trouble with my circuit using an ADG819 for cold booting a radio module. My application is typically in the nanoampere range, so I use this for switching redundant systems when my main MCU ...
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I want to build a small “inline power meter” that sits between a power source and any Device-Under-Test and reports current. I chose INA228 because it has high-resolution. I need to measure a wide ...
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I have an application where I need a gate of somekind for both switching a higher current than my MCU I/O allows(5mA) and to prevent current leakage from said MCU pin (My application is at around ...
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Please reference the pic below. Image is from the datasheet by CUI Inc. for the PDQE20-Q48-S12-D. I'm a little confused about caps CY1 and CY2. We've been using this CUI DC-DC Converter with good ...
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Deep Dive into Ultra-Low-Power Design: STM32U0 + E-Paper + SHT45 (CR2450) I am engaged in a project focused on extreme power efficiency, and I am currently at the schematic review stage prior to PCB ...
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I'm currently getting into the newer AVRs with the AVR64EA28 (very happy so far). The playground project does: measure temperature with the ADC and a thermistor transmit measured temperature with an ...
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As I understand it, the ESP8266 can be reset by pulling either the Reset pin or the Enable pin to 0V. Holding either pin at 0V will keep the ESP in reset indefinitely. In addition, holding Enable at ...
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I am making a wireless doorbell that uses ESP8266 microcontrollers. To save power, I am considering two possible approaches: Use normal wifi, but put the modules in modem-sleep, where the processor ...
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Assume we are to create a simple MCU data logger that will record the amount of times the apartment door has been opened. Door has a small SPDT limit switch fitted, which pulls the pin of the MCU low ...
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Can someone please review this schematic and share their views, if this is the correct way to power up a 5 V DC device in an industrial environment. The input voltage could be 12 or 24 V DC and the ...
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I am designing a battery-powered device. It consumes quite a lot, at its peak it can consume up to 300 mA, but this is required once a day for a second. It is necessary to live a long time on the ...
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Im trying to design a level shifter from (2.5-5V) to (1.8V). Other requirements: Power loss (when 5v signal high, bellow 40 uA) Quick switching (560 us pulses) My current design, seems good in the ...
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The QX5252 is a part often found in solar light systems. It is a blocking oscillator that connects to an external inductor to boost a single niMH battery from 1.2V to 3.3V. It has an operating voltage ...
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I made this battery powered circuit: The circuit contains a microcontroller, which drives LEDs and a mosfet, and reads inputs such as the button, battery voltage via a voltage meter, and signals from ...
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I am looking for solutions to detect the rotational speed and direction of a permanent magnet rotor. I thought this would be easy, but every concept I considered falls short somehow... Does an off-the-...
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I am learning how to set up interrupt and low-power features on STM32F446RE Nucleo board. So far I managed to configure interrupt of general-purpose timer (TIM3) and successfully wake ARM CPU on the ...
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I was wondering what's a reliable way to measure the discharge capacity (or the battery charge) for a LiPo battery? I'm using something that draws very little current but there might be bursts where ...
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I'm working on the development of an electrical board that should operate in both standby mode and ON condition. The board may include an STM32 MCU. I'm designing the power scheme for it, and a ...
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I'm encountering an issue with a circuit that incorporates an STM32F103R8T6 microcontroller. In my design, the MCU's VDD domain is powered by a battery, while an external supply is used for the analog ...
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I'm having trouble getting a Digi XBee3 DigiMesh RF module (mounted on a Digi Grove Development Board) to boot fully and communicate with an IX15 Industrial Gateway when powered by a solar-powered ...
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I'm developing a board with ESP32. The power source will be up to 4 AA/AAA batteries. So possible 1.2-6V. The batteries count is one of the variables. I need 3.3V/250mA for the ESP32 and few other ...
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My friend and I bought an HP 50g a while ago, and we're really satisfied (and sometimes impressed) by the capabilities of this calculator given its age. So far we're enjoying using it, but something ...
fpp's user avatar
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What time do you allow for soft start? I notice most are between 100ns and 2ms. I don't need to wait for over 100ms. But how do you pick your time? and around what time would be too much. For ...
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I have a 3.3v circuit with a device that indicates Power Good with a single open-drain pin. When there is a fault, PG is ...
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I have now updated my system based on the feedback received but now have new questions. To recap, I have developed an electro-mechanical system (for proof of concept) that generates an AC signal at 5....
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I have this circuit here: The signals PWR and BTN_RST are used to turn on Q3, which, at the same time, turns on Q1 and ideally we'd see VBUS (3.7V), or a bit less due to the voltage drop in Q1, at ...
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Link to MATLAB & Simulink files: https://drive.google.com/file/d/10hG0oOyMZtza1jTbSUYh39C3fjJTs9c8/view?usp=sharing I'm implementing a low-power buck converter with the following specifications: ...
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I am working on my own PCB with an ESPWROOM32. I an using one of the 2 I2C bus to communicate with 2 digital potentiometers AD5245BRJZ5-RL7, here there datasheets : datasheet_potentiometers, and one ...
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This is my first time posting in this forum. It was recommended to me by a friend. I have a background in mechanical engineering and am looking for some help regarding battery charging. I have ...
TB27's user avatar
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I have a microcontroller that needs to be powered ON only when there is light in the ambient, otherwise it should stay OFF. To achieve this I use the power latch described here and a simple light ...
spanito's user avatar
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DALI relay modules have L/N/PE inputs. KNX relay modules do not, and trigger relays on bus power alone. Given that in both cases the bus power is sufficient to flip a bistable relay, why do DALI relay ...
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I have spools of wires rated for 60 V from the manufacturer. But my application requires 150 V for safety but I am only powering some 4-20 mA sensors with it. The wires are 16 AWG. Can I use these for ...
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Can a phototransistor be used to open circuit a power rail so circuit is only active during daylight hours?
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I have a device that can be powered from USB but also from primary batteries. Battery voltage is higher than USB voltage. When USB is connected I want to drain as little as possible from the batteries....
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I’m working on a low-power (battery operated) IoT device using ESP32, and it will have a corresponding phone app. The device will be idle most of the time, so I’d like to put it in “deep sleep” mode ...
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I was wondering if/how it'd possible to mod a frontloader NES (traditional NES design with the front door hinge) with an LED that activates when opening the front door hinge, but the power to the ...
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I am designing a portable device based on the STM32WB55 with alkaline batteries as a power source. I want to use either AAs or AAAs as they are more readily available for the average user. In terms of ...
Ian Jackson's user avatar
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I am currently looking for a basic wire connector (banana plug like or else) that are rated for 8 kV DC but with a very low current (20 uA). My question, would a regular 15 A rated connector be ...
Fenrir's user avatar
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I have a rechargeable coin-cell that needs to be protected from overdischarge. It supplys power to a Real Time Clock and SRAM ICs when my application is not powered(3.5uA). I was thinking of using a ...
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Let me preface this by saying I have minimal electronics experience and reading data sheets is slightly confusing, but I get a gist of how most components work. I am making a lower current continuity ...
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I have a low power detection circuit for a truck battery. It detects if the power of the battery is going below 11.8 V and turns off a relay. The circuit worked amazing on the table. When installed on ...
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I’m designing a touch LED lamp using a 18650 battery and a TTP223 touch sensor (TTP223 datasheet here. I’m also using a CD4017 to have different light modes and a boost converter to power the LEDs ...
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I want to select a ESD protection IC for my circuit with the following conditions: Battery based and ultra-low-power Battery voltage 3.6 V My sensitive chips inside my circuit has Absolute Maximum ...
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I am working with my custom PCB with STM32L053R8T6. My code works just fine when I run it in debug without any stop mode (deep sleep). It enters to the RTC and button interrupts perfectly. However, ...
Nicat Ali's user avatar
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In HT12E we continuously transmit even when the input data pins are not changed.My problem is battery optimisation. I am transmitting only ON/OFF switch state through HT12E based RF module and Since ...
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I'm working on a battery powered project which I'm currently planning on powering over USB Type-C for flexibility. The 5V/3A spec would satisfy my needs for the high end of power draw, however, I want ...
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Source: https://tangentsoft.com/elec/vgrounds.html I am trying to design a circuit using a single battery as shown in the image above, I am worried that all the decoupling capacitors that will go from ...
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I recently designed a PCB that is battery powered. Ideally I want this to be a low powered device, and as such have endeavoured to implement controls and systems to decrease power consumption. My MCU ...
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I'm working on a low-power project using an esp32 and an e-paper display which will be used indoors. It uses a lithium ion battery. I want to harness solar power so the battery has be manually charged ...
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