Monitoring three phase power usage with Arduino and keypad shield

This project is second iteration of DIY Life. Previously he has built a single phase power meter using similar technique. He wanted to keep things very simple, os he used only non-contact current measurement only by using Talema AC1030 current sensors on each phase line. They are capable of capturing 30A nominal and 75A maximum current. In order to measure power accurately a voltage measurements should be taken. But for sake of simplicity, voltage is only taken as 220V. The only focus is to measure current correctly which depends on burden resistor selection and measurement drop voltage through Arduino analog input. Input current then must be calibrated with known load. Rough estimate can be made with 100W light bulb. If you are considering building this three phase power meter, be sure to simulate project on provided Autodesk Circuits simulator. Here you can tweak your circuit and test sketch code. Continue reading

Energy meter with Nixie tubes

Normally every house has power usage meter where you can see how much power you have used. But sometimes you might want to see how much energy you are currently using and probably trace the devices that are most energy hungry. John decided to instal energy meter next to his power meter. He didn’t want to use LCDs or LED indicators that wouldn’t look great next to meter blown glass face. So he went with Nixie tubes. He used couple of ready made nixie tube modules that already accept 5V and can be controlled via SPI interface. He paired Arduino with ESP8266 module to have good ADC and IoT functionality. He found out that Nixie tubes draw quite some power – 300mA. So he went with only two modules to reduce the overall impact. He made unit indicator that would allow indicating from 0 to 100MW. Only two significant figures are always visible. This is more than enough for rough monitoring. Power is measured with SCT-013 clip-on current transformer which has current sensing resistor. Arduino samples the output and calculates… Continue reading

Arduino based Solar energy meter

When you harvest energy using solar panel or wind mill you definitely want to know how much you get of it. The obvious way is to use power and energy meter. deba168 have installed a small 10V solar panel plant at his living place in order to light LED bulb when power goes off. After his setup he decided that he wants to monitor energy outcome of it. So he started another project where he monitors power and energy of his plant. He have chosen Arduino which is pretty easy to get going. Measuring power and energy is a matter of measuring current, voltage and time. Then all parameters can be calculated. Voltage measuring is easy by feeding it to analog input. Since voltage may get a bit higher that Arduino power supply, there is a resistive voltage divider used. Current could be measured by using current sense resistor, but deba168 used current sensor module ACS712 which works by using hall principle. The last parameter – time is measured using Arduino library. Having this he was able to calculate output… Continue reading

Versatile and open home energy monitor

Energy cost money, so it is good idea to keep track on usage of it. Following project is dedicated to monitoring of whole house energy consumption. It has plenty features that enable do various fun stuff like seeing real power usage, apparent power, power factor, RMS voltage/current, frequency and cumulative kWh. The values can be viewed on four 7 segment LED panel or via web interface that allows graphing energy usage. Energy measurement and Ethernet interfacing is done by Arduino boards. So there is not much of board making than wiring and burning sketches. And once again, be careful when dealing with mains. Continue reading