For my project, the Lithium Ion Polymer Battery - 3.7v 2600mAh powers arduino, transmitter and a few other parts. My whole design works on 3.3v.
I'm trying to build a simple circuit to indicate the status of the battery using LED.
When the voltage of the battery is consumed below 3.0v(3.7v -> 3.0v), I want to light on the Red LED.
It would be better if green LED indicates it is being powered or the voltage is above 3.0v.
The low voltage does not have to be 3.0v. It can be lower or higher depending on the circuit.
I found some link and tried to build a circuit based on it.
http://www.made-by-bacteria.com/forum/viewtopic.php?f=59&t=479
The first one I built, it does not seem to be working for low Vcc like 3.3v.
http://sharingmanual.blogspot.com/2011/03/op-amp-voltmeter-circuit-with-led-bar.html
For this one, I didn't know if I should use the zener with 3.3v breakdown voltage.
Can anyone suggest me how you can go about this? or suggest me a link? Any tips will be appreciated.
I'm trying to build a simple circuit to indicate the status of the battery using LED.
When the voltage of the battery is consumed below 3.0v(3.7v -> 3.0v), I want to light on the Red LED.
It would be better if green LED indicates it is being powered or the voltage is above 3.0v.
The low voltage does not have to be 3.0v. It can be lower or higher depending on the circuit.
I found some link and tried to build a circuit based on it.
http://www.made-by-bacteria.com/forum/viewtopic.php?f=59&t=479
The first one I built, it does not seem to be working for low Vcc like 3.3v.
http://sharingmanual.blogspot.com/2011/03/op-amp-voltmeter-circuit-with-led-bar.html
For this one, I didn't know if I should use the zener with 3.3v breakdown voltage.
Can anyone suggest me how you can go about this? or suggest me a link? Any tips will be appreciated.
