# Tagged Questions

129 views

### How do I measure ~16V battery voltage in an ultra low power system?

I am trying to estimate remaining battery life in a low power system. The battery is very well characterized so that reading the battery voltage will be sufficient for my needs to estimate remaining ...
114 views

### Pulling power off a battery stack at different voltages

If I'm powering a device with a series-connected stack of rechargeable batteries, can I pull different voltages at different points and route them to different components? I need to run a 12V ...
147 views

### How to power the microcontroller in a BMS of a large battery pack

Yeah, it's a short and simple question but I couldn't find an answer on google. Just imagine I got a lots of LiIons in series , about 400 Volt for use in an electric vehicle. I use some ICs to ...
209 views

### Can I estimate remaining battery life by measuring its voltage with the same MCU that it powers?

I'd like to estimate the remaining battery life of a battery that powers a microcontroller. Could I accomplish this by simply leading the battery into the MCU's built-in ADC? My idea is that I could ...
263 views

### Wiring an illuminated toggle switch

I'm trying to build a model rocket launcher circuit. So far I have this The igniter requires 12V and 3A, BAT1 is 12.6V 9800mAh. The arduino input pin should read HIGH when the igniter is connected ...
153 views

### Searching for a Micro controller with a battery capability

I am working on a low power design, which will have a MCU powered by my regulated DC power supply from mains(220VAC). But when the Mains fail, I intend to have a battery connected to the chip that ...
253 views

### Fix the Problem for Shunt Resistor due to Temperature & Current Sensor

I am trying to build a current sensor here. My original thoughts starts from this paper [real-time current-waveform sensor with plugless energy harvesting from AC power lines for home/building ...
908 views

### How do I calculate how long my robot's battery will last?

I am building a robot with multiple types of sensors, 2 motors for locomotion, and 2 motors to control a robotic arm. I am using a variety of color, IR, tilt sensors and such. How would I factor in ...
40 views

### Exemples how to connect camera module with micro-controller (Record videos) [duplicate]

Possible Duplicate: develop webcamera with battery and memory to SELF RECORDING (Disc Processing System) i have searched everywhere on the net on how to connect the camera module with micro ...
872 views

### How can I measure battery voltage with my MCU?

I am currently using the PIC24FJ128GA010 and I am planning to use Input/Output port to connect my 4.2 V LiPo battery and to check if the voltage value doesn't go below 3.7 V. I am thinking to ...
215 views

### battery voltage with microcontroller [duplicate]

Possible Duplicate: Arduino has an input value in disconnected pin I wish to measure the voltage of a 1.5V battery using a microcontroller (supply voltage of 3V). I thought of connecting ...
466 views

### Coin cell battery for Bluetooth?

I'm trying to determine which battery to use for my application. I'll be using a class 1 or class 2 Bluetooth (not low energy) module, which requires about ~50/60mA of RX/TX current. In addition, ...
1k views

### USB / Battery Switchover Circuit

Background: I am a non-EE (an 0x11? :^) thrust into the world of embedded systems design. I started this project with a only college physics-level understanding of circuits, but I'm gradually ...
2k views

### Least expensive way to plug in a microcontroller into 120V (without wall wart or batteries)

I need to be able to power a Atmega168 by plugging it into a wall. The circuit is a little bit more complex but not too much. The Atmega168 needs between 1.8V and 5V at 200mA. The ideal solution ...
464 views

### How can I simulate a battery's current/voltage characteristics?

I want to simulate a battery whose behaviour can be controlled by a microcontroller. If the battery is at low charge and there is a high current, the voltage should decrease. Any solution for this ...
586 views

### microcontroller low battery indicator

I am powering a board and circuit with a 9V battery (those alkaline ones). And I would like to read the 9V battery to keep track of how much power it has left. I have read that I can do this with a ...