I love your varius projects, Julian. Keep it up! =)

hi. i know this is a old video but i was wondering if you could upload a wiring diagram of the fuel gauge, charger, battery and arduino. i am hoping to do similar thing for a project myself now

Enjoyed the video. I'd recommend a logic analyser if you're getting into protocols like i2c. The simple ones that use PC software are very cheap and incredibly useful.

You could desolder the jst connector from this to make it even slimmer. Got one of these myself and one Adafruit Lipo battery and one I ripped out of a tiny video camera. I'm probably going to experiment with this this week.

great work julian, can't wait to see it running! :)

Can I do the same for automotive battery (car battery)? I'm trying to create a system to estimate its lifespan and capacity.

Hi Julian, I always enjoy your vids. Do you know if there are any Arduino groups around west London? Also, can you recommend any books suitable for someone hoping to take electronics a bit further than the absolute basics -- I'm thinking something like a general practical handbook of the handiest circuits and ICs. Looking for books on Amazon or ebay is difficult because you can't easily flip through them to get a feel for which ones are going to be useful. (The ones I've bought so far with promising sounding names have turned out to be a bit of a disappointment.)

Why do some people change the R3 resistor for low MAH batteries and some don’t. Thanks

Can i use this sensor for my solar panel battery (12v 40Ah)?????if not pls suggest a solution.

Hey Julian, I've always just used the analogue pin on arduino with voltage divider and a function I wrote ages ago for battery level (including analogue smoothing algorithm) which has always worked great for me to show voltage / percentage remaining etc, however I've been playing with one of those adafruit high side DC current sensor (In219 or something, can't remember) but anyway, really like it and very accurate, I'm interested to see how this little chap pans out for you, I've looked at this lipo 'fuel gauge' but not sure what it offers over 'standard' arduino analogue input method etc?.. My latest project is using data logging to analyse the battery current and voltage continually and therefore i can calculate the total power usage in terms of mAH consumed over time and reference that against the total mAh of the battery. With Lipo chemistry we need to avoid going anything below 30% charge for nice long life of the cell.. obviously the only way to make a true lipo 'fuel gauge' is to indeed monitor live usage and calculate total consumption. Otherwise it's just best guess based on mapping percentage of voltage - usually 4.2v 100% down to around 3.5v as 0%. Great vid, interested to see how you get on in part 2 ;). Btw, which OLED you got there? I'm running dual 128x64 oleds (mono colour, 1.3" adafruit) absolutely rocks on the teensy 3.1 :). Cheers bud.

FYI. They are just €2.10 on Aliexpres

Questions: Why is it for LiPo? Does this mean that no other battery pack can be used?

If I build a battery bank with multiple 18650 batteries in parallel, can I monitor them with a single MAX17043? Would it provide a correct soc readings?

Julian how to use 2 max 17043? Can i set two different slave address to each one? Thanks. I need to monitor two battery at once using arduino nano.

Is it possible to connect a solar Panel on the LiPo charger and switch automatically between solar Panel and USB charging??

You should break the connection between protection and charger, and insert the fual gauge there. Otherwise I expect you to get very wrong capacity messurements. Are you sure the battery is not protected by a board on the cell?

I must be missing the point in why this is more use than just getting the voltage with an analog pin?

I used arduino UNO and i am getting SOC: -1.00%, VCELL: -0.02V as output and nothing else please help

Help -anyone got this working on a raspberry?

i found I2C address at 0x32 ,it didn't work even though i changed the address from 0x36 to 0x32 in the library

The logo on the board is from sparkfun, where you can find all the info www.sparkfun.com/products/10617 This seems to be a clone.