Comment summary #16
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Comment 151 ... 160
| date | article | author | comment |
| 14 feb 2017 07:06:10 | Arduino wattmeter | Polash | @Freddy thanks for your response actually I am not getting Arduino nano v3.0 here but another nano version in here..although every pin is same with v3.0 but some components different.. Can I replace with it?? And I am not getting IC LTC1050-CN8 here..can I replace it by any IC??? Please inform me I am waiting for your response.. Thanks in advance.. |
| 13 feb 2017 18:52:44 | Measuring capacitance and ESR | Glenn | Very useful article. A couple of corrections on Method1: The VRs equation should have the second square term outside the brackets, i.e.: ( Vg*sin(a) )^2 The Reactance calculation should be "sin(phi)", not "sin(alpha)". |
| 13 feb 2017 18:50:39 | Measuring capacitance and ESR | Glenn | Very useful article. A couple of corrections on Method1: The VRs equation should have the second square term outside the brackets, i.e.: ( Vg*sin(a) )^2 The Reactance calculation should be "sin(phi)", not "sin(alpha)". |
| 12 feb 2017 22:26:10 | Arduino wattmeter | John | First of all thank you for sharing your work with all of us! I intent to use a "simplified" version of your meter to display the Voltage, Current and Power of a PSU i am building, that is based on the Velleman k7200 (one 0-30V DC positive output). The is no need to measure negative values, so i plan to only use two analog inputs to measure two analog 0-1V voltages against the on-board ~1.1V Refence: One would be the PSU Output voltage and the other the Voltage on the Rs (current shunt), both measured against the (common for PSU and Arduino) Ground . I will not use an Op Amp since i already use a shunt to control the Current of the PSU via Op Amp, that will provide a 0-700mV voltage that is accurate enough for me (assumed 1.1Vref @1023 values ADC). My question is, besides maybe removing the code for calculating unnecessary parameters and subtracting the Rs voltage Drop from the Vout value to correctly measure it (right?), what changes are needed to measure voltage against the Ground (and not a "floating" 0.55V)? Thanks again, John |
| 09 feb 2017 19:54:55 | Arduino wattmeter | Polash | #Freddy thanks a lot but for your information I spent whole day on it to calculate Q directly... As you given Q=Veff Ieff Sin@ but I couldn't do anything.. and how will I get constant voltage and current how to get Veff & Ieff??... will it be okey if I calculate phase from PF=Cos@ or @=Cos-!(PF)???? |
| 09 feb 2017 09:53:10 | Arduino wattmeter | Freddy | That is the same as equ. 6 in meettechniek.info/measuring/power.html In that case you have to find a method to measure the phase first. And this can only be done if both the voltage and current waveforms are pure sinusoidal. You can measure the phase by measuring the zero-crossing time difference. |
| 09 feb 2017 05:59:34 | Arduino wattmeter | Polash | @Freddy Actually he told me that there is VAR meter in market, so that I have to measures reactive volt ampere directly by using Q=VIsin@ equation.. if you have any idea please help me...thanks in advance |
| 08 feb 2017 22:57:29 | Arduino wattmeter | Freddy | How is the reactive powed defined without using Pythagoras? |
| 08 feb 2017 21:39:32 | Arduino wattmeter | Polash | @Freddy thak you for your response.. I did modify your code as I need to measure only 10parameters as Vmean, Vrms, Imean, Irms, PF, Preal, Q, S, Energy, frequency... so all desire parameters I am measuring successfully in protius software ... and I am gonna implement it in hardware within somedays.. but here's I need your help about to write code of reactive power like real power...as my supervisor told me to calculate reactive power directly not from the power triangle or pithagoraus theorem.. Please help me about to write reactive power code like real power code...thanks in advance.. |
| 06 feb 2017 10:01:31 | Arduino wattmeter | Freddy | I don't know how you modified the program, so it's difficult to help you with that. But the solution is simple: In the line: byte paramPointers[4] = {0,7,13,18}; // Parameter pointer for each display line change the four integers as required. These numbers point to the parameters in the line below. |