Some cool battery graphs

Salvo wrote:
I don't know how much electronic knowledge you have. Just a cautionary note. The a/d has a 4V supply voltage. That means you can not measure voltages greater than 4V. In order to measure battery voltage you first use a resistor divider to reduce voltage to a usable range for the a/d and then multiply the a/d output by a specific factor to get the actual voltage.

You don't need any resistor divider to measure shunt voltage. This voltage is down in the millivolts. In order to measure both charge and discharge currents you need two a/d channels, operating in differential mode. The a/d you're getting has 4 channels. One channel is used to measure battery voltage and 2 channels are used to measure current.

I use a separate 9.6V Ni-CD battery (and 5.3V dc/dc converter) to power Arduino. This particular battery was used in a remote control car for grandson. I think you will get a measurement error if you connect Arduino directly to house battery. You could get an isolated dc/dc converter to get power directly from house battery.

The first step with Arduino is to write code to make a led blink. It takes a few baby steps before getting to the stage of measuring and storing data.

grizzzman wrote:
Ordered 2 temp sensors and the screen. I want live and stored data.

Thanks Salvo for the information. The hardware side is no big deal for me. I ordered a couple of voltage dividers that had screw terminals when i ordered the temp sensors. That prompted me to order a screw proto shield.
The C+ code is another matter. I remember looooonnnng ago spending an hr programming (I guess you would call it an early pc?) A 6"ish green round screen with a keyboard and a 5 1/2 floppy drive. Just to get a tiny stick figure to move its arms and legs......lost ALL intrust in C at that time.

That being said, I would like to play with home automation (Trailer) solenoid triggered with a temp sensor hot water tank return system , a hydronic water heater system with a 300 watt solar assist heater coil and then lastly, A BMS system for a future lifepo4 battery upgrade.( After alot of research i dont agree with what amounts to high voltage charging for the stupid balancers. This free's me up to set a more conservative voltage setting and the ability to shut down the step up voltage system coming from the tow rigs alt.

I agree baby steps. I have read several books on the arduino programming and have a better grasp. That being said at times my eyes would glaze over and all i could see was "bla bla bla"

Thanks again