Comment summary #36
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Comment 351 ... 360
| date | article | author | comment |
| 29 nov 2015 08:55:31 | Arduino wattmeter | kalyan | can i connect analog gnd to digital ground, how do you seprate analog and digital gound |
| 29 nov 2015 03:03:40 | Arduino wattmeter | Manuel | How about the shunt resistor because that type so hard to find, can I change another type??? If can, please list its name. |
| 26 nov 2015 03:29:00 | Accuracy, precision & resolution | Rhys | This is a really useful article but I am slightly confused as how to work out the uncertainty of the system I have. In particular the probe (PKT 520A-RO). The probe has a Attenuation ratio 10:1 +/- 2% at DC (connected to a scope with an input of 1Mohm +/-1%) and an input resistance (system) of 10Mohm +/- 1%. Which am I suppose to use? Note: the scope I am using has an impedance gain of 1Mohm +/-1% and a measurement uncertainty of 1.9% with the scale I'm using. |
| 20 nov 2015 11:09:00 | Arduino: Analog measurements | Freddy | Thanks for your remark. I've changed the code comment. |
| 19 nov 2015 15:40:25 | Arduino: Analog measurements | Tralamazza | Code 5 ADMUX = 0xC3; // measuring on ADC3, left adjust, internal 1.1V ref The comment should read "right adjust". |
| 17 nov 2015 10:14:08 | Arduino wattmeter | Freddy | The temperature coefficient of carbon resistors is very poor. If you need the performance as intended with this project, you should use the prescribed components. Else you may use other components. |
| 17 nov 2015 09:27:26 | Arduino wattmeter | upin ipin | the metal film resistor can be replaced with carbon resistor type or not ? because that metal film type was hard to find it. |
| 12 nov 2015 20:59:21 | Arduino wattmeter | Freddy | Yes, also the power in inductive loads is measured correctly. That was the whole purpose of this wattmeter: measuring the real power regardless the load or voltage and current shape. The last chapter in this article "Software" explains the used sampling method. The microcontroller on the Arduino has an 10 bit ADC. |
| 12 nov 2015 07:23:11 | Arduino wattmeter | kalyan | will your design work for inductive type loads like motor. because in inductive loads the wave form is not pure sine. can you tel me your adc sampling method i tried in pic micro but failed to get accurate results in inductive loads what bit adc that your hardware has? kindly help regards kalyan |
| 26 okt 2015 21:51:50 | Arduino wattmeter | Freddy | Probably the MAX432 will do. However I'm not sure about the minimum supply voltage of this device. Just try it, it is the best option you have. |