Questions tagged [low-battery]
The low-battery tag has no usage guidance.
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Embedded device with Hardware issues consisting atmega 328p, RFM96 and ADXL345
I have a device that works on 3V battery (2 D size cells) now I want to debug it so that all the devices work correctly. My device consist of atmega 328p, running on 08 MHz Crystal which gets readings ...
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Simple circuit to bypass preamp when battery fails
A guitar has an on-board battery powered pre-amp between the pickups and the output jack. This is great until the battery fails, when it goes dead until the battery is replaced.
I would like to have a ...
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Best way to halve 12V battery voltage for 6V device, while still being able to measure the battery level?
I have a device that is powered by 4 AA (4x1.5V=6V) batteries, but I want to power it with a 12V battery.
The device measures its input voltage to determine the battery level. I only need to know if ...
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Troubleshooting a Low Voltage Cutoff (LVC) Circuit for Overdraining Prevention
I am attempting to design a Low Voltage Cutoff (LVC) circuit to safeguard against overdraining my 12V rechargeable battery. The objective is to halt circuit power once the battery voltage drops below ...
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Unpowered LM393 Comparators
I'm working on a battery powered device and would like an LED to come on when the battery is getting low. In the given schematic, the LED is a red LED having a forward voltage of 2V, Lite-On product ...
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MSP430FR4133 Low Battery Voltage Periodic Monitoring
Here is the code I used to configure and monitor my voltage that when it becomes 1.2V, BATTERY_ON symbol on my LCD is ON. The checking of voltage is every 10 seconds. This code below works using ...
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Why would a battery pack read as a lower voltage before being disconnected from device, then read as a higher voltage after [duplicate]
I'm working on a device that uses a proximity sensor to count the number of times something passes through its field of view at a certain distance. It is connected to an Arduino Nano and a battery ...
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Electric guitar with active electronics and a DIY battery gauge
There is a primitive DIY battery charge monitor which blinks a LED after input voltage drops lower a certain level. Let's call it battery gauge. Also, there is an electric guitar with active ...
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RTC UPS power cycle on low battery
My RTC UPS switches on and off the whole time when the battery is low.
I think it could be with the voltage monitor circuit as with the led indicator on the ups it shows the ups's battery voltage is ...
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Are there any substitutions for depletion PMOS transistors?
I am currently building a low-voltage cut-off circuit. When the battery is under 10 V, the microcontroller should pull the battery power to ground which will blow the fuse with high current and cut ...
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When is it time to change out batteries in multimeters?
On my multimeter, the D.C. voltage readings get inaccurate over time due to battery discharge.
How can I tell when to change out the batteries?
By consulting the manuals, I found what is displayed ...
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Ultra-low power low battery disconnect circuit
I am trying to design a circuit to replicate the behavior of the LTC4071 battery charger/protector IC (see datasheet here). In particular I want to replicate the low battery disconnect function which ...
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Single-cell lithium battery powered comparator circuit with hysteresis
I recently was reviewing a circuit I made and began to question its feasibility. The circuit cuts off a battery's connection to a load after the voltage has fallen below a certain threshold.
To ...
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Trinket M0 - Using USB serial out when running on battery
I am using a Trinket M0 for navigation lights on an electric R/C plane. I thought it would be useful to also use it to monitor my LiPo voltage so I know if it is safe for another flight. For debugging,...
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Voltage of 3 V batteries [closed]
I ordered 3 V CR2 batteries. Actually they are 2.92 V and 2.93 V.
Should I consider them faulty, or is this difference from the nominal voltage acceptable?
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