Tagged Questions

4
votes
1answer
166 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 ...
2
votes
2answers
138 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 ...
1
vote
2answers
165 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 ...
1
vote
2answers
519 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 ...
0
votes
0answers
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 ...
4
votes
2answers
508 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 ...
4
votes
1answer
170 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 ...
3
votes
3answers
338 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, ...
3
votes
2answers
947 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 ...
6
votes
4answers
1k 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 ...
2
votes
1answer
388 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 ...
6
votes
2answers
512 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 ...
2
votes
1answer
305 views

What quiescent current draw of my circuit would be acceptable for a 100mAh battery?

The microcontroller and several sensors of my circuit draw 10µA in sleep mode. I am using a 100mAh lithium polymer battery. Is this quiescent current acceptable? Should I install a physical switch to ...
16
votes
3answers
1k views

Making a battery last a long time in a microcontroller circuit

I'm hoping to power an ATtiny85V for a nice long time on some small battery, probably a coin cell. I've looked into the software side, and my code is watchdog timer driven, has unused analog and ...
6
votes
3answers
1k views

Wide voltage supply for PIC microcontroller

I am looking to power a PIC microcontroller with a supply voltage that ranges from 4.5V to 18V. This will be a battery powered device so I would like to conserve power, ie. linear regulators like the ...