UltraSmartCharger Forum

That's plenty accurate enough to say that the temperature error isn't due to an incorrect voltage from the regulator...

I'm rather puzzled as to what's going wrong to be honest... I'll have to do up a modified version of the firmware for you and see what difference that makes...

If you remove the micro SD card from one of the chargers, you will find the pads for the ISP header underneath. With the charger facing so that the ISP header is closest to you, can you measure the voltage between the leftmost 2 pads. If you can do that and report the voltages on both of your charge...

Do you have access to a multimeter perhaps?

OK, that's quite a big error - around 36 to 37 degrees!

I'll have to work out the adjustments required and get back to you.

Are you able to do another test when the ambient temperature is either significantly higher or lower - that should make it possible to tell whether it's just an offset error, or if there is also a scaling error as well.

Hi Martin, I'm guessing that you're seeing the same error on both channels of that charger which is reading 15 degrees high? I'm curious as to what's actually causing that - if both channels are giving the same error, the sensors are probably fine - it might be the voltage regulator which is putting...

If you use the mouse wheel - you should see that scrolling one way zooms in and the other way zooms out.

Alternatively, if you click and drag from the bottom right towards the top left, that should also zoom out.

Although in theory, dT/dt should be a reliable termination method, in reality, I don't think that it is. Unfortunately, there are far too many factors that can cause problems - e.g. turning off an air conditioner in a room can lead to a sudden rise in temperature which could lead to a false terminat...

If you want to, you can configure a capacity limit which can be set to the correct figure to give you a fixed charging time based on a fixed charging rate. Keep in mind that the capacity limit is a fail safe limit which means that if the limit is reached, the charger will terminate the entire proces...

If you're wanting to know the average discharge voltage, you can calculate it quite simply by dividing the measured energy by the measured capacity. If you're wanting to match cells based on capacity and average voltage, it's even simpler - just compare the measured energy and measured capacity - if...