Since many circuits run on higher voltages such as 12V or 20V, we can use a voltage divider to scale a large input voltage to a range suitable for the Arduino to read. However, the Arduino can’t measure anything above 5V without risking damage to the input pins. Since the Arduino chip we’re using – the common Atmega328 – includes 6 ADC (Analog to Digital Converter) pins, it’s really just a matter of reading the measured voltage at the positive input terminal and saving it for later when we calculate our power. Since our device includes both an ammeter for measuring current, and a voltmeter for measuring voltage, our device needs to be connected in between the power source and the load on both terminals.
#Power designer battery logger code
Because we have the power of Arduino at our disposal, we have the opportunity to add these features by just popping some more code into the program. 1Wh = 3600J) or even dollar figures when factoring in the average cost of electricity, $0.24 per kWh here in NSW, Australia for instance. This can directly be converted to other units such as Wh, kWh, (e.g.
By then integrating (effectively adding up the power readings over time) the power, we can get the total work done by the device in Joules. While we can’t measure power directly, we can measure both voltage and current and then multiply them to get a resulting power figure. Conveniently, in DC circuits it is also equal to Voltage multiplied by Current. A microwave oven, for example, might use 1000W, which equals 1000 Joules of energy per second. Testing a circuit’s efficiency, charging, or use time in the case of battery-operated devices, or simply just testing the operation of a power supply to ensure it is working properly are just some of the many applications for these devices.įor those getting started in electronics, the total energy per second a device uses is known as power, expressed in Watts and is the equivalent of Joules Per Second. Often when making and testing circuits, it’s vital to know how much power they’re using, potentially for a number of reasons. It also has a 9V battery and a LCD display to make it fully portable! BUILD TIME: 4 HOURS Monitor and log the behaviour of lab gadgets with this Arduino power logger! It can log voltage, current, power, energy and even disable or enable your connected circuits if something is not quite working as it should.
0 kommentar(er)
