1/16/2024 0 Comments Arduino lipo voltage monitor![]() ![]() When the battery goes down, so does Aref, and you will have the same A/D value and so the same voltage readout. But you can't measure it with default Aref. The second one looks more convincing to my untrained eye (I’m a software person who hacks hardware in a somewhat cookbook style - generally after massively over investigating things). You can connect a <5volt battery to the analogue input (wise to use 4k7 or 10k resistor between +battery and pin). I did find this project (using a RaspIO Duino) and this one (involving a different resistor layout) using an Arduino Nano. But I didn’t come across something that had that “this is definitely the answer” feel. something in the learning sections of Pololu, Adafruit or Sparkfun. Usually one can find a fairly definitive looking project for this kind of thing, e.g. The alternative with a bit more work would be to wire up something nice and tiny like an M0 trinket (although after taking 2 pins for I2C, to talk to the main MCU, I’d only have 3 analog capable pins left over - so maybe it’s a bit too tiny). this project on Instructables does exactly that. I wouldn’t have per cell data but I’d know the alarm was monitoring the individual cells and activating the buzzer when the first of them went too low. The easiest thing to do would be to buy a low voltage alarm and desolder the buzzers and wire their connections into my MCU. ![]() ANY LIPO charger worth it's salt will charge the unloaded battery until full then stop. I ASSUME they use an internal converter or regulator. a breakout with a balance connector and a small IC with e.g. You can use 2 resistors to form a voltage divider, and safely measure the battery voltage using an analog pin. From experience elsewhere, I know the cells in a LiPo can discharge in a surprisingly uneven manner so I’d like to monitor the individual cells via the balance connector.Īs this isn’t the core of the project I was hoping to find a ready to go solution, e.g. But the quirks that I have pointed out just take away from any confidence in using this device in a serious LiIon or LiPo project.I have a small robot project and I want to monitor the LiPo I’m using. There is a lot to like about the very stable voltage, current and power readings this device displays with a lot of good resolution too, many digits. I missed having a JST header on Vout port and QWIIC header would have been nice to have too. The 1.5 amp charger capacity is nice instead of being limited to 500 milliamps. There are nice things about this device such as the values returned from the monitor chip are signed or unsigned 16-bit integers, which makes converting to BCD digits for a character display very easy. Makes one wonder what the state of charge really is. When connecting a charger the SOC number immediately changes to something different. It appears to work best when connecting a "rested" battery and then monitor the discharge profile. Never really know what the "real" state of the battery is with numbers shown. ![]() View daily NJ weather updates, watch videos and photos, join the discussion in forums. Timers are another feature that didn't seem to follow what the data sheet says. Get the latest New Jersey Local News, Sports News & US breaking News. Nothing changed the almost static reading 4 digits. Tried different wiring on TS terminals and cut the jumper. ![]() Battery Temperature measurement doesn't seem to be reading anything that I can tell. Current and Power measurement are also great with polarity and 5 digits of resolution. Other lithium battery chemistries with lower voltage maximums will not work and will experience an over-voltage event if they're used with this.īattery voltage measurement resolution is great at 3 decimal places to the right. > Sparkfun: Please note in the product description that this device is ONLY for use with batteries that have a max voltage of 4.2V. (Don't keep your phone or laptop at 100%! Cycle it every day and let it "die" every once in a while). LiFePO4 doesn't mind sitting at full charge for long times, unlike other lithium chemistries which will degrade faster if they're not exercised and if they're kept at full charge. Glad I read that before plugging it in to those batteries.įor anyone who's curious about the differences in chemistry, you should use a LiFePO4 chemistry for use-cases where the device will mostly get power from elsewhere (like the wall) and the batteries will be sitting at full charge for long periods of time without being exercised. Unfortunately my project requires LiFePO4 which has a max voltage of 3.6V! There is no way to modify the output of this device to intercept the 4.2V and drop it down to 3.6V without making all the other features of the device basically pointless. I bought this along with some LiFePO4 batteries, only to discover upon closer reading of the datasheet that this device can only work with batteries whose chemistry lets them go up to 4.2V. ![]()
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