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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.

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“Opentherm” interface. Power design of a thermostat

I'm trying to understand OPENTHERM protocol (by its hardware part). In a couple of words opentherm is a 2-wire interface used between thermostat and boiler. The data from thermostat (master) to the ...
Evgeny Ayzenberg's user avatar
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1 answer
61 views

Stop Mode 2 (deep sleep) doesn't work with STM32l053R8T6 MCU

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
1 vote
0 answers
14 views

Creating a short signal transmission in HT12E based RF communication

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 ...
Anandhan A's user avatar
1 vote
0 answers
24 views

Low Quiescent Current over USB Type-C [closed]

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 ...
TianCilliers's user avatar
4 votes
5 answers
579 views

Do the decoupling capacitors act as capacitive load to the opamp which is used to make a virtual gorund?

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 ...
Pranav Agumbe's user avatar
2 votes
1 answer
37 views

Recommended way of power switching external modules & peripherals

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 ...
Explorex's user avatar
  • 408
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0 answers
43 views

How to design a battery charging circuit for solar panels and USB

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 ...
uzumaki's user avatar
  • 195
1 vote
2 answers
73 views

Which component is likely raising the temperature measurement on my BME680 sensor board?

I have integrated a BME680 temperature, pressure and humidity sensor on a PCB with NL27WZ17 Schmitt triggers (U3 & U4), a RT9193-33GB LDO regulator (U1) and a CM1224-04SO ESD diode (D2). I also ...
Tommy95's user avatar
  • 179
0 votes
1 answer
41 views

RF power transmission control in U-blox GSM modules

I am using the SARA-U270 GSM module and want to test energy-saving techniques. One technique I would like to try is power transmission control, adjusting the transmission power in dBm based on the ...
Aleat's user avatar
  • 179
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0 answers
24 views

ULP circuitry for a telematics unit

I am in the process of developing an ultra-low-power input circuitry for a telematics unit. The device will be connected to 24V truck battery and should be completely disconnected from the battery if ...
user14665305's user avatar
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49 views

Interdependency Issue in Power Enable Circuits for Sensor and Modem Controlled by STM32L476RG

I have designed a power enable circuit to control the power supply to both a sensor and a modem, each with its own dedicated power enable circuit. The MCU used is the STM32L476RG, and the power enable ...
Hafiz's user avatar
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4 votes
7 answers
2k views

What happens if a microcontroller stays in reset?

Triggering a reset with the reset pin is usually expected to be an event, but what happens when a microcontroller's reset pin stays triggered? For example, I am working with an STM32F411RE on a ...
D.Pod's user avatar
  • 43
1 vote
1 answer
47 views

Selectively Activated External Circuit for ADC Measurement

I'm looking for efficient yet simple-to-integrate solutions where analog signal outside of microcontroller's range is being measured (e.g. 12V power supply) and measurements are done selectively. This ...
lucenzo97's user avatar
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29 views

AT Commands for SARA-R510M8S (SARA-R5 evaluation kit)

I am using the SARA-R5 development board, specifically the SARA-R510M8S model (LTE + GNSS), with an Arduino Nano Every. My goal is to determine the GPS position and send its location via SMS, aiming ...
Aleat's user avatar
  • 179
0 votes
2 answers
39 views

Vcc for MSP430FR6047 with a battery- Ultra-Low-Power system

I want to design an Ultra low Power device with MSP430FR6047, which can work over 10 years. For the supply power of MSP430FR6047 in the datasheet it is mentioned that the voltage on the supply pin ...
Andromeda's user avatar
  • 477
1 vote
1 answer
52 views

Substituting for 1N34A diode to change range of microwave detector

In connection to an earlier question, this DIY device for detecting "mini radio" EMF seemed like it might work to detect microwaves generally, assuming diodes exist to replace the 1N34A ...
daniel's user avatar
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1 answer
85 views

Can I use electromagnet to hold a cabinet door shut while driving (in my campervan)?

I have a bathroom/kitchen cabinet in my camper van that I keep forgetting to close correctly before driving away. Then in the first corner it'll swing open. I was wondering if I could use an electric ...
Joel's user avatar
  • 111
0 votes
1 answer
34 views

Sleep mode of SGP40 sensor

I'm trying to develop a system which has a feature to monitor air quality using a SGP40. I want this board to be in sleep mode most of the time and only wake up if the sensor detects alarming ...
404's user avatar
  • 15
0 votes
0 answers
33 views

LT1308 or other IC? [duplicate]

I am trying to power a microcontroller with a single coin cell battery. The MCU consumes around 15 µA or 1.2 mA (depending on if the power LED is kept on) in power save mode. I found the LT1308 to be ...
AmateurEnthusiast's user avatar
1 vote
1 answer
50 views

Reducing current consumption for a PIC16 / Sleep mode

I would like to operate a PIC16F628A in sleep mode with less than 1 µA. For that I have switched off all ADC, peripherals, etc.. But about 7.5 µA is the lowest current I can achieve. I have found a ...
Olaf Rechtner's user avatar
0 votes
3 answers
71 views

What makes it hard to lower energy and power consumption for a computation: looking for serious but pedagogical reference

I would like to get "general" culture about what limits engineers in reducing the power and energy consumption to compute. Please correct me if I am wrong but for power, I know that there ...
StarBucK's user avatar
  • 167
0 votes
1 answer
77 views

What's the best way to make sure I have a known VCC on a battery powered device?

I'm making a portable device (well not really portable, but intended to be set up away from mains power) powered by AA batteries. I need a stable VCC as I have displays that I don't want the ...
Steam Ranger's user avatar
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0 answers
35 views

ESP8266 with 1C5V Relay - always ON

Please find the circuit: I am using NodeMCU ESP8266 and 1C 5V Relay. ESP8266 board is connected to the USB port of laptop and it is powering the board. The problem is, whenever I upload the code to ...
Akhilesh B Chandran's user avatar
1 vote
2 answers
82 views

Low power toggle switch

I have used a 555 to toggle output on/off from a push button pulse and was wondering to use something similar to TTP223 due to its low consume once with 555 have more than 10mA in standby, anyway ...
Daniel Pechmann's user avatar
2 votes
1 answer
56 views

Step-down, ultra-low current kVDC and boosting current [closed]

I have a constant current source that can only give a maximum of 1 μA DC but can maintain this current level from less than 1 V to a few thousand volts, depending on the resistive load. I calculated ...
nothingreh's user avatar
1 vote
0 answers
40 views

esp8266 (ESP-07S) draws 100 micro amps in deep sleep instead of 20 as documented

I have a quite simple circuit using ESP-07S module (esp8266 chip, no USB, no LEDs). The device, after performing some operations enters deep sleep and waits for a button connected to RST to wake up (...
PanJanek's user avatar
  • 279
0 votes
3 answers
136 views

How to connect oscillator to MCU for power saving operation

I have to connect an oscillator (RTV-104EF13P-S-10.000-TR) to an MCU (STM32G051F8P6) in order to have a more precise clock. The datasheet provides very little information about the ...
Harry's user avatar
  • 103
0 votes
2 answers
53 views

Power supply for IoT low power

I am designing power supply for IoT low power. The circuit is powered from 3.6V lithium battery. The system includes: MCU: STM32L151, 1.65 V -> 3.6V LTE Module: 3.4V -> 4V, Imax < 0.2 A and ...
Kay Juu's user avatar
1 vote
1 answer
57 views

Low power consumption/leakage tips and tricks (input NC magnetic reed switches)

I have an ATtiny412 that has 2 pins (PA1, PA2) set as internal input pullups. These 2 pins (PA1, PA2) sense magnetic reed switches with the NC setting. GND is active when closed on these switches. The ...
Jonas's user avatar
  • 179
1 vote
2 answers
73 views

Convert falling 5 volt signal into latch circuit trigger [closed]

I want to detect when a micro controller board has lost its wall PSU power, and use that knowledge to move it to a battery back up. Specifically, I want to use a latch circuit like the one ...
Eradicatore's user avatar
2 votes
0 answers
187 views

Problem with battery power circuit

I am a 14 years old boy and I am currently making a MacroPad with a 3.7V battery and a charging circuit but powering the circuit with a battery does not seem to work. I also have made some ...
Loic Daigle's user avatar
2 votes
3 answers
1k views

Looking for circuitry to save power on an I2C sensor

I have an I2C sensor connected to a microcontroller. The whole system is battery powered, so I need to find ways to switch off power from devices when they are not in use. For the sensor, I am ...
user14665305's user avatar
0 votes
1 answer
70 views

Optimizing power efficiency: Troubleshooting high power consumption in analog reading circuit

I've been facing some issues with my analog readings. The problem has been somewhat resolved using the following circuit design: You can find more information about the circuit's 'function and its ...
Blueman's user avatar
  • 25
1 vote
1 answer
90 views

Low power solution

I am designing a circuit for low power Iot device and trying to get as much as possible from the battery (Lipo). I placed bq25170 as battery charger and tps7a20(3.3v) as LDO. I would need to power a ...
user130227's user avatar
0 votes
0 answers
68 views

STM32G4 low-power mode

I have an issue with going into low power mode on the STM32G473. To be able to use the low power regulator the SYSCLK must be below 2Mhz however it seems impossible to reduce the SYSCLK that low on ...
Birdie's user avatar
  • 41
0 votes
2 answers
116 views

Is there some low power and fast circuit to move non-consecutive bit 1s to consecutive bit 1s (packing the bit 1s)? [closed]

Given n bits, for example, 00100110110001, there are six 1s in these bits. I want to output 11111100000000, which moves the non-consecutive bit 1s to the left of the string. I know some sequential ...
Yu Qian's user avatar
0 votes
0 answers
92 views

How to use small photocell to trigger wake up pin for extremely low power consumption

I want to trigger microcontroller wake up event using a photocell that produces voltage when light. I have BPW46 photocell and ATTiny85 in deep sleep, interrupt is configured to be trigered by PB3 pin ...
PanJanek's user avatar
  • 279
4 votes
1 answer
536 views

How to prevent photoresistor sensor from draining battery

I'm looking for a simple hack to minimise current when detecting change in light intensity using photoresistor. I'm using ATTiny85 in deep sleep (power down, ADC disabled, using below 1 microamp) ...
PanJanek's user avatar
  • 279
0 votes
1 answer
44 views

Relay for long LED run need 4 amps - MOSFET or Coil?

I've been using coil relays for automotive electrical stuff for years, but in the MCU / embedded world there are PWM driven relays as well. I get that 5v will operate the coil on the smaller 10 amp ...
WouldRatherBuildAMotor's user avatar
0 votes
2 answers
104 views

Why do we need output isolation for power-gated blocks?

In their CMOS VLSI Design, Weste and Harris give the following discussion of power gating a block of logic: I am in particular interested in understanding the need for output isolation here. Is the ...
EE18's user avatar
  • 1,161
0 votes
2 answers
52 views

Passkey register in microcontroller MSP430FR59xx

We recently had a Power Aware Computing class on the university where we used the microcontroller MSP430FR59xx. We had to examine how different voltages, clock frequencies, ULP modes affect the power ...
Ribisl's user avatar
  • 156
5 votes
1 answer
2k views

What happens if an MCU boosts its own supply voltage while running?

I'm designing a low-power, battery-powered sensor node using an ATtiny1626 microcontroller (1.8V~5.5V supply with low clock speed), powered directly from 2x AAA batteries (various chemistry, let's say ...
Tirdad Sadri Nejad's user avatar
0 votes
0 answers
138 views

Choosing LDO to power ESP8266 on lithium battery

I want to power ESP8266 on lithium battery with a PIR sensor and have a small solar module to charge the battery, there is also weird looking 3pin transparent light sensor that by guess testing I ...
asim's user avatar
  • 600
1 vote
1 answer
123 views

Low power, isolated, compact 230AC to 3.3DC power supply with very low heat dissipation? [closed]

Need an isolated, compact 230V AC to 3.3V DC power supply with very low heat dissipation. No heating is extremely important as – unfortunately – this regulator will be placed enough close to a ...
Zoltán Bíró's user avatar
0 votes
2 answers
74 views

Can a 6V DC circuit turn on a separate/unconnected DC circuit?

Can a 6 VDC circuit be configured to switch on a second, separate 3 VDC circuit? I had thought that an inductor's magnetic field could be used to close a normally-off reed switch, as illustrated in ...
BirdsInMyBrain's user avatar
1 vote
1 answer
119 views

Low power circuit design for powering an e-paper display

This is a follow up to my last question on Low power circuit design for turning an LDO on/off at specific voltage levels, where I wanted to find a low power way to turn an LDO on/off at specific ...
enwi's user avatar
  • 77
2 votes
1 answer
206 views

Low power circuit design for turning an LDO on/off at specific voltage levels

I am designing a low power circuit that uses the TPS61023DRLR for energy harvesting, charging a 1.5F ...
enwi's user avatar
  • 77
2 votes
0 answers
69 views

Is energy lost on a powered, long, but unused DC power line? And how?

I am designing a super low power sensor system with a master and multiple, simple clients connected with a 4 wire bus (differential signals, GND, DC low voltage VCC on shielded twisted pairs). The ...
MoonCactus's user avatar
1 vote
0 answers
93 views

STM32WL ADC during STOP modes impossible?

I want to sample a signal with the ADC for a certain time (one-shot) and keep the CPU in the lowest power mode possible. ADC is triggered by TIM1 and DMA is set up. When using SLEEP mode, ...
Robert L.'s user avatar
1 vote
1 answer
43 views

Can I use VSYS output on NPM1100 as input to another regulator?

After designing a power system around an NPM1100 PMIC, we noticed that as our lipo battery decreases to around 3.55 V, the regulation out 3.0 V starts to drop (see graph below). We do have a sensitive ...
tronhawk's user avatar
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