Do I remove the R1 resistor?

alcar21 / WemosEM

Cheap power monitor (STC013) with Home Assistant Discover and Wemos D1 Mini / PRO (esp8266)

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Do I remove the R1 resistor? #19

Open Quercus84 opened 3 years ago

Quercus84 commented 3 years ago

I have a SCT-013-030 and my readings are off when using the ICAL proposed on http://lechacal.com/wiki/index.php/Current_Transformer_Conditioner. I need to push the ICAL up to 140 to get something reasonable. However, I was using the firmware from the domology tutorial and my readings were correct with the hardware as is.

I saw that @rechena ended up removing his in this issue #14 but I'm not sure if I should too.

So, do I take it out?

Thanks!

rechena commented 3 years ago

If you have the same shield as I had yes you need to remove resistor 1 as it's a burden resistor which already exists in the 030. Alternative is to get a 000 ct.

Quercus84 commented 3 years ago

Ok. I'll try that. Hopefully nothing burns :p

With what ICAL did you ended up?

rechena commented 3 years ago

I ended up with 30ical, one suggestion on the resistor is remove only one side, so if in the future you buy a 000 you could just solder the resistor back. I ended up buying another board and a 000 but mostly because my house often goes above 30amp. I still get measures with this one but to be more precise.

Hope it help

On Fri, Nov 6, 2020 at 6:58 PM Quercus84 notifications@github.com wrote:

Ok. I'll try that. Hopefully nothing burns :p

With what ICAL did you ended up?

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/alcar21/WemosEM/issues/19#issuecomment-723246002, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAYTZRU7DNCNJOOCN7TZVA3SORBO3ANCNFSM4TM74WXA .

-- Best, Joao Rechena

Quercus84 commented 3 years ago

I removed the resistor and the readings improved. However I am still calibrating the system. With an ical of 30 the readings are overestimated. I'll put the final number when I get it.

alcar21 commented 3 years ago

The measurements aren't precise because it has a margin of error, sometimes great. I recommend that you calibrate the average power that you use at home. For example, if you consume an average of 2kw, perform the calibration with a device that measures more or less that. The value of Ical 30 is approximate.

Quercus84 commented 3 years ago

I am calibrating using the daily total in kwh. Currently with ical=26 is still a bit high.

Seraf commented 2 years ago

Hello,

Maybe someone here may help me 🙏🏻 I bought the same 30A model, so I removed the R1 from the shield. I don't think my current problem is because of this R1, as I tested different wemos and different shields (with and without R1):

When I start the wemos without the shield, I can access the wifi, access the webserver.
When I hotplug the shield, I can still access the wemos, but I can't get any relevant result. The led of the shield is off.
When I boot the wemos with the shield attached (I think that's how it's supposed to be done), the led of the shield turns on (and the led of the wemos turns off), but I can't access at all the wifi. I have no connection to it.

I'm using the last 1.3.2 firmware version.

I tested with multiple powers, computer, phone charger etc ... I verified with a multimeter, I have my 5V on the pins of my wemos, but I also have power on my shield etc ... I don't know what I'm doing wrong ..

IMG_20220826_103719 IMG_20220826_103823