![]() Powering the Arduino UNO board thru the Vin female-header is basically the same as using the DC barrel jack. Obviously, this simple trick allows the onboard voltage regulator circuitry to stabilize the microcontroller power rail aright thus prevents the battery from frying Arduino’s sensitive electronics. And, as the voltage of the battery varies with use, I would always wire it through the Vin header. Usually, I’m using 3S LiPo batteries to power my standalone Arduino projects. Well, now you can go through this link to access that great post Arduino & 3S LiPo Battery! In this article, you can see an in-depth explanation of Arduino UNO’s power supply subsystem. ![]() Luckily, the Arduino’s internal power supply circuitry is designed to do the right thing no matter which recommended power source is plugged in! First off, it’s good to note down that, in addition to the USB power supply the external power sources for Arduino are linear/switching power supplies, and primary/secondary batteries of various types. Thank you.When you want to build a standalone Arduino project, the first thing to consider is how to power it once the setup is disconnected from the computer’s USB port. If you have any comments, suggests, or feedback let me know in the comments below. ConclusionĮven though you can buy an 8S lithium battery monitor with probably more features, this one gives you more flexibility and also the confidence that its doing what it is suppose to do. Make sure not to include spaces as this will not calibrate if you do.Īfter the calibrate is complete, calibrated values are stored in EEPROM so that after power is removed then the board is still calibrated. The simplest way of calibrating each value is to measure each cell with a multimeter and write down the values. You can calibrate using the serial monitor with an FTDI board connected to the UART port of the cell monitor. Now before you can get accurate measured values, you need to calibration each ADC input to fix the offset from each IC. Once you are satisfied with your value then you can save the value by pressing the enter button and this will save to EEPROM so that its store permanently even after the power is removed. Using the up/down buttons you can increase or decrease the value by 0.05 increments. In order to change the values, navigate for example to the OVP value with the arrow and then click the enter button to enter the OVP value screen. Now even though I have the debounce circuit and a small software delay, the movement is still not smooth but it sufficient to operate. Once you are in the menu screen, you can navigate using the up and down buttons. In order to get into the menu screen you need to press the menu button and hold for about a second or two. ![]() In the control menu you are able to set the UVP value for cells and pack as well as the OVP value for cells and pack. But I will go over the important sections: Normally I would breakdown every section of the code but its too large to fully go through the code. See below for a snip-it of the schematic: I’ve decided to go with the ADS1119IPWR which is a 16-bit I2C adc. Now with 16-bit adcs, we have a resolution of 0.9mV/bit which is a huge increase. If we go with the internal adcs of the arduino, with a 10-Bit ADC we will only have resolution of 17mV/Bit. Since we need to step down the voltage from 30V max and need the best resolution possible. I’ve decided to go with two external 16-Bit adcs instead of the internal adcs of the arduino. Here we talk about the most important part of the project and that’s the ADC section. The main sections we will talk about are: Now here is were the fun part starts with the hardware used to create this DIY cell monitor. The main purpose this is designed for is to measure an 8S Lithium Iron Phosphate pack up to 1mV resolution. Fault detection: Over-voltage, Under-voltage.Voltage measurement resolution: 1mV accuracy.This project is open source and so you will have the ability to add features or change them. Its a very basic and not a lot of bells and whistles but still powerful enough to allow you to monitor cell voltages with accuracy and precision. Here we have an 8S arduino based voltage cell monitor that I designed to allow the user have control on how they monitor there batteries and how its displayed. Like all my other projects, I’ve decided to create my own custom version of a cell monitor. ![]()
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