Will using a 6.6 Volts power supply affect the performance of an Arduino Due?

Using Arduino Project Guidance
1

Hello, I am planning on using a Li-Po 2S battery. They have a discharge curve which I plan to stop in 6.6Volts, that is the lowest voltage for the project will be 6.6 Volts.

It is said the recc. voltage is 7-12 volts, but at 0.4 Volts lower, will this damage or affect my performance in any way?

The project absolutely needs to be reliable, because I'm building a quad prototype, which can't be falling out of the sky once the battery is low.

2

It is said the recc. voltage is 7-12 volts, but at 0.4 Volts lower, will this damage or affect my performance in any way?

Yes

Mark

3

It'll lower the voltage of the regulated 5v to potentially lower than 5v (due to regulator dropout) - the chip itself should keep on chugging though, since it runs at 3.3v, and so you're nowhere close to running into problems with the dropout there.

You'll probably be fine (as long as you don't need a regulated 5v), unless there's some other factor I'm forgetting.

It's a shame they couldn't have sprung for slightly better regulators...

4

If you are monitoring the voltage, then once it gets as low as 7v, head for home. You probably have a little leeway there. Trial and error, and hope all your batteries are as good as the trial one.

What is the full charged voltage? ~ 7.6v ?

Are you using the same battery to power the motors, or a different battery?

5

It's about 8 Volts fully charged and yes the battery is for motors. Nothing crucial is powered by the arduino, mostly sensors and LED's which need accurate readings and I'm thinking of simply switching all the sensors and pins I use to 3.3Volts instead of 5Volts, probably more efficient too anyways. The regulated 5Volts shouldn't be a major problem either, it might change the reading of some sensors slightly but isn't the AnalogRead function using a built in reference voltage? I assume that if the voltage drops, analogRead will be able to compensate for that. If not I might have to change all sensors to the 3.3Volt input and change the "reference voltage" to 3.3Volts.

6

By default the analogRead used the 5v ref.
So, It may be a good idea to switch the ref to 3v3
Make sure to put a few caps around, especially on the analog input pins (about 0.01 or 0.1uf).