USB Power Monitor

[iloveelectronics]

This looks quite interesting - I may have to pick one of these up to play around with. Presumably once enabled it just keeps firing data out of the UART?

Correct. It just keeps sending the data until you disable the feature in the bootup settings. Note that the bluetooth module will draw a few mA to operate so the current reading on the power monitor will be offset by that amount accordingly.

[sidecross]

I ordered the USB 2.0 Power Monitor (Black) YZXstudio 18-Bit Voltage Current Meter OLED with 2.5 firmware from 99centHobbies at $28.99. 

[Haldi]

doesn't look beautiful but you can easily unplug it


Works awesomely

[iloveelectronics]

doesn't look beautiful but you can easily unplug it

Works awesomely

Excellent! Who cares what it looks like as long as it works well

[iloveelectronics]

I ordered the USB 2.0 Power Monitor (Black) YZXstudio 18-Bit Voltage Current Meter OLED with 2.5 firmware from 99centHobbies at $28.99. 

99centHobbies on eBay is me Thanks for the business!

[Haldi]

I have a question about the serial output.
I've attached a Log file in this post for a 2h session recorded via Android app. The problem does also occur on Windows.


Every few lines, total randomly no fixed intervals, there is a break to much.
This is not a dropped/missed information as i've recorded for 1h55min15sec and had +-10sec that time after I've deleted all empty lines.

Any idea why this happens?

Edit: cant upload .log files ^^ pastebin here we go
http://pastebin.com/iYRgQEAH

[iloveelectronics]

I have a question about the serial output.
I've attached a Log file in this post for a 2h session recorded via Android app. The problem does also occur on Windows.


Every few lines, total randomly no fixed intervals, there is a break to much.
This is not a dropped/missed information as i've recorded for 1h55min15sec and had +-10sec that time after I've deleted all empty lines.

Any idea why this happens?

Edit: cant upload .log files ^^ pastebin here we go
http://pastebin.com/iYRgQEAH

Yes, I know what you're talking about. It might be a glitch that adds some extra new-lines at random times. I will ask YZXstudio the next time to speak to them.

[sidecross]

I ordered the USB 2.0 Power Monitor (Black) YZXstudio 18-Bit Voltage Current Meter OLED with 2.5 firmware from 99centHobbies at $28.99. 

99centHobbies on eBay is me Thanks for the business!

Thank you too, it was pleasure to make sure you were the person I was buying from. Thank you for the service and labor you provide. 

[sidecross]

I received my yzxstudio usb2.0 monitor from Franky Tong and his service and help is very much appreciated. I would highly recommend buying from him. 

[n00]

 Franky Tong ??

About ordering u can buy this on ebay for ~30$ , on "china" site for 20$ , from producent site for ~15$.

For me i have a question for ppl who tested that power monitor.

I want to measure battery mAh capacity. is it possible?? I want to charge like camera, mobile phone or others electronics and test how much battery capacity they have.

[SeanB]

they do not discharge the battery, but tell you how much charge went into the battery and unit, which is a fair estimate of the battery capacity. To do a capacity test on the battery you will need to have another unit which is a battery tester, which takes a full battery and discharges it at a constant current till it reaches the low voltage cut off point. Frankie also has those in his store.

Using both together ( providing you can take the battery out) will tell you battery capacity and charge efficiency, but in many cases the battery is not removable so you can only do a charge capacity and then estimate the usable capacity.

[n00]

Thank you for your replay. Can you be more specific ??

I have already bought KEWEISI 3V-9V 0-3A . I charged my DSLR camera and it showed over 1600mAh when it was fully charged, but my battery capacity has only 1050mAh ... the same is with the phone.

On the market you have many USB Power monitors but i want to know only how much my battery has capacity. I have many different batteries and i don't want to waste too much time on checking each battery with different aproach. The best solution, i think, is to measure the capacity when i charge my electronics via USB port.

What product can you recommend me??

[Haldi]

No,
You need more energy to charge a battery than you can store in a battery. It takes 13.4wh to charge my Smartphone but I only have (3100mAh x 3.8V) 11.7wh capacity.

If you want accurate measurements you need to measure the discharge of a battery.

[n00]

I tested KEWEISI and now i will test Matek USB Power Meter/Monitor Voltage&Current Meter.  I only paid 0,35$ from:

http://en.jd.com/product/Portable-LCD-USB-Power-Charger-Voltage-Current-Waltt-Detector-Tester_783750.html

Before you register write 95Z5BQ in Invitation Code then you recive 10$ coupon. MZW:10,05$