![]() * 1 x 25v voltage sensor module connected to arduino analog pin A0 * 1 x ACS712 current sensor module connected to arduino analog pin A4 * 2 x DS18b20 dallas temperature ic's their data pins connected to arduino digital pin 3 * The node monitors battery voltage,current into and out of the battery, ambient temperature and battery temperature. The Sketch: /*Sketch for a MySensor node to monitor a 12v battery with a solar panel for charging During construction I found powering the circuit from the usb port to give unreliable results and opted for a dedicated 5v supply instead. The 20A ACS712 shows a change of only 100mv for every 1A so you can see even small fluctuations can cause sizable errors in your readings. When using the analog inputs of the Arduino it is very important that you have a very stable 5v supply voltage. That means when the module sees 25v on its input the output of the module will be 5v.ġ x LM2596 regulator module or some other regulator able to supply 5v I have used a module that has a maximum reading of 25v. Only one line of code needs to be modified to suit your selected device.ġ x Voltage sensing module or 2 x resistors to be used as a voltage divider. Choose whichever current fills your needs. My notes are based on my breadboard version which was built around an Arduino nano, In the final I used a Pro Mini.ġ x Arduino I have used a Nano but other types or OK tooġ x ACS712 Current sensing Module. ![]() ![]() I have included the temperature monitors after a friend had his battery develop an internal short and melt in his caravan, not a pretty sight. it monitors battery voltage, Charge current, Dis-charge current, Ambient temp and battery Temp. Ok this node has been running for a few weeks now so thought i would share it with others. To date it has been used to run a system of night lights and reading lamps but now that I have found Mysensors I hope it will soon be powering a lot more. When we built our home I ran a 12v Backbone as well so we can access the low voltage power all over. The power system consists of a 200w panel on the roof and a 105AH battery located in our server cabinet. He is brand new to programming.I have installed a node to monitor our 12v auxiliary supply for our home. Pierce is retired and has been into electronics for quite a while, but now finally feels like he has some more time to tinker with stuff like Arduino. Serial.println(voltage) //show value on serial monitor Serial.print(“Voltage = “) //show “voltage before value on serial monitor Voltage = readValue * (5.0 / 1023.0) //calculates real world voltage Int readValue = analogRead(voltPin) //read pin A0 value PinMode(voltPin, INPUT) //input variable dc voltage Int readValue //value received from the voltPinįloat voltage //declare the voltage variable Arduino Code: Basic Voltage Readerīyte voltPin = A0 //assigns the voltage input pin Via USB from my computer Was the training at Programming Electronics Academy able to help you build your skill?Ībsolutely helped me to get my head around this programming Arduino stuff. I learned to use the basic programming process and put it to real world use. Looking back on this project, what can you say you have learned about programming and/or electronics through the creation process? Yes it turned out as I hoped showing “Voltage = 1.9” from a rechargeable Battery. I could have just plugged it into the Arduino but since it was the first step in my project I just used the breadboard. Then, I took the GND pin on the board and plugged it into the negative rail on the breadboard, next I plugged the positive battery lead into the A0 pin slot and the negative lead to the negative breadboard rail. Then I just had to figure out how to hook up the circuit. What was your biggest struggle as you worked through this project?įor me, it was fairly easy thanks to a previous lesson in the series “Using analogRead()” in “The Bread and Butter of Microcontrollers:” module. It takes the input from a AA or AAA or rechargeable battery or any voltage source 5 volts and below, calculates it into a value the Arduino can understand and displays it on the serial monitor. I needed a simple project to help understand things before I progressed. I built this as a stepping stone to incorporate into my next project which will be a battery level indicator using LED’s to indicate battery strength. Pierce, why the heck did you build a/the Basic Battery Voltage Reader? This basic battery voltage reader put together by Pierce Harvey, a customer of Programming Electronics Academy since April of 2018, is an example of just that, a simple project designed to help him make sure he had some basic programming concepts down. When you’re just getting started with programming Arduino, sometimes the simplest projects can be very instructive. Get 10 tips every new Arduino coder should know ➜
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