Official specifications
- Product Model: U2
- Voltage measurement range: 4-24V
- Voltage measurement resolution: 0.0001V
- Current measurement range: 0-5A
- Current measurement resolution: 0.0001A
- Capacity accumulation range: 0-99999Ah
- Energy accumulation range: 0-99999Wh
- Temperature range: -40℃~180℃ / -40℉~356℉
- Display screen: 1.77 Inch color TFT 128×160 display
- Product size: 52.5mm x 34.5mm x 13.0mm
Interfaces
PC Program
Measurements
Current Accuracy (Brightness Level 1, Loaded) | ||
V | A | Display A |
5 | 1.00145 | 0.99942 |
1.50035 | 1.49757 | |
2.00060 | 1.99643 | |
9 | 1.00145 | 0.99944 |
1.50045 | 1.49725 | |
2.00060 | 1.99652 | |
12 | 1.00145 | 0.99958 |
1.50095 | 1.49784 | |
2.00060 | 1.99642 | |
20 | 1.00161 | 0.99957 |
1.50125 | 1.49823 |
Voltage Accuracy (Brightness Level 1, Unloaded) | ||
V | Display V (5 Digits) | Display V (6 Digits) |
5.04615 | 5.0448 | 5.04481 |
9.07260 | 9.0706 | 9.07061 |
12.1102 | 12.106 | 12.1067 |
15.1193 | 15.115 | 15.1156 |
19.9804 | 19.975 | 19.9758 |
Own Current Consumption | ||
V | mA, Display On | mA, Display Off |
Brightness Level 1, USB HID Port On | ||
3.81 | 20.61 | 18.27 |
5.05 | 20.66 | 18.43 |
9.08 | 20.77 | 18.46 |
12.12 | 20.82 | 18.50 |
15.13 | 20.87 | 18.62 |
19.99 | 20.91 | 18.71 |
Brightness Level 1, USB HID Port On, w/ External Power | ||
3.81 | 0.04 | 0.03 |
5.05 | 1.94 | 1.68 |
9.08 | 20.71 | 18.33 |
12.12 | 20.72 | 18.35 |
15.13 | 20.74 | 18.54 |
19.99 | 20.93 | 18.61 |
Brightness Level 1, USB HID Port Off | ||
5.25 | 19.98 | 5.53 |
- The accuracy of the current is good, but the voltage is not. The voltage needs to be recalibrated.
- When brightness level is set to 1 and USB HID Port is on, own current consumption is around 21mA with display on and 19mA with display off. When USB HID Port is set to off, it becomes about 20mA with display on and 6mA with display off.
- The internal resistance is about 32mohm (Includes both connectors).
- The lowest working voltage is about 2.9V, but it needs to be read in the dark.
Behavior/Logic
This UPM begins to consume external power once the input voltage is lower than the external supply voltage.
—- FW v2.4 —-
It behaves like a source with power limited when it triggers/requests the last PPS APDO. When the requested output voltage exceeds the nominal Prog voltage, the it limits the requested output current such that for a PDP Rating of x Watts the requested output current limit is calculated as RoundDown (x/requested output voltage) to the nearest 50mA. So you won’t get the max power even if the source is not PPS power limited.
UPDATE 8/14/2018
- I overestimated its algorithm. When the requested power (output voltage * max output current) exceeds the PDP, it limits the requested output current such that for a PDP Rating of x Watts the requested output current limit is calculated as RoundDown (x/requested output voltage) to the nearest 50mA. Let’s say, PDP = 30W, Requested Output Voltage = 11V, and the Requested Output Current will be PDP/Requested Output Voltage = 30W/11V = 2.73A RoundDown to the nearest 50mA = 2.70A. So you won’t get the max power even if the source is not PPS power limited.
Bugs
It has some software issues when powered by an external power source, but no such issues without an external power source.
The PD Listener loses packets even when using external power and operating correctly.
Ah and Wh calculation errors. This happens when USB HID PORT is turned off and the screen is off. Some data seems to be missing when the screen is turned off.
Conclusion
The highlights of this UMP are the interesting action recognition and g-sensor. Other than that, the rest is not very impressed. The factory voltage calibration is not done well. And the own current consumption is a little bit high when the USB HID Port is on. Also, the performance of drawing curves is not very good. In addition, the PC program is very simple and crude. However, new firmware is released often. Hope some of the issues will be fixed in the future.
Mutual Support
The following is a list of files discovered, created, modified, or provided by U2 users to help others. If you are a U2 user and would like to add your work to this list, please leave a comment or contact me.
- Official (Up to date): User’s Manual, PC Software, Firmware, Android App APK or RAR, 10/14/19
- English lang.ini by Medeoker, 05/08/20
- English lang.ini by Alessandro Divani, 03/04/20
- PC software v4.2 + firmware v6.3 by bikeribi, 06/14/19
- Official: PC software (Up to date) by Mandos, 01/11/19
- Another place with U2 firmware up to date by bikertibi, 01/11/19
- Official software support: U2 Manual, U2 PC Software v2.3, U2 Firmware (Up to date) by bikertibi, 01/02/19
- Firmware V4.7 11/01/18
- Firmware v4.0 by classicua, 10/14/18
- English language file for PC program by Peter V, 08/28/18
- U2 software package (including manuals, PC program, and firmware V3.3) received from the seller + U2 firmware upgrade instructions (in English) by Tony, 08/28/18
- U2 firmware upgrade simple instructions by Magicmeter, 08/27/18
Thank you all for your hard work!
I have a WITRN U2P running latest firmware 9.4. I am facing an issue with it where I see an error on the screen which says – ERR:04: M
This is new unit & works fine when tested & also goes to DFU mode (except the display). I don’t know how but I disconnected/ reconnected pressed some keys here & there simultaneously and it started to work fine.
After few days when I took it out, it again stopped working and shows same error on the screen again.
Is there a way to factory reset it? Please help. Here are the pics:
DFU Mode: https://prnt.sc/1ushn1k
Screen Display: https://prnt.sc/1ushsva
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http://www.witrn.com/ is Back Up!
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can someone please post last firmware for the 4 buttons this link is dead
https://www.file.io/download/ZAuIsmytqdk5
Thanks
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There seems to be a new v9.4 Firmware for it.
http://www.witrn.com/?p=86
http://www.witrn.com/witrn/U2/U2P_Firmware_V9.4.rar
I could install it without a problem through the PC Software, but in my case i have a bug with the protocol auto detection. It keeps telling me to remove USB HID cover (i did remove it) and to replug the device.
Has anybody else tried the new firmware and had any luck with the Protocol Detection?
Luckily a downgrade to v7.8 works without any issues.
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I can confirm the issue on the 9.x firmware. I dont find a way to make to work..
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I play more with the new 9.4 firmware and work just fine but they change the way of testing and now require all the time for this operation an external power supply. For some chargers it made different set of tests, and it auto restart to check different conditions (test sets I suppose). I suppose the need of using an external supply is needed for this process to keep the old results in memory. It add also new triggers for MI and other new chargers. In rest seems to work fine. The MTK protocol is not all the time recognized at the end of tests set.
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Thank you very much for the update bikertibi – appreciate that. Then i’ll give the firmware another try.with an external power supply.
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Thanks again. I just tried what you said and that works for me as well with the new 9.x Firmware. It looks like there is a translation error because the tester says to unplug USB HID but we need to plug it in to be able to test as you said.
Great advice…maybe this can be added to the article at some point.
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Hi guys,
is the WITRN website definitely gone ?
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Good day!
Please give me the firmware v9.4 (4 buttons).
The “witrn” site has been closed since August.
Thanks!
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This includes the last backup I have. Windows Software v4.6, the 4 key Firmware v7.8 and v9.4 as well as the v7.8 PDF Manual.
https://www.file.io/download/ZAuIsmytqdk5
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can you please repost firmware 9.4 this like is dead
https://www.file.io/download/ZAuIsmytqdk5
thx
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Oh, that was quickly deleted. Here is another link to my dropbox
The whole bundle
https://www.dropbox.com/s/iwi9drnagtm8y8i/WITRN_U2.zip?dl=0
Just the v9.4 4 key firmware
https://www.dropbox.com/s/p83q68j0oidmmq0/U2_9.4_4Keys.u2p?dl=0
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Thx for the fast response
do you know whats going on did they change the name of their website or just quit cause i still see their products online even some newer ones
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I have picked these USB testers as the best ones currently available for sale: KT002, FL001, FNB48 and U2. Can you advice which one should I pick, which one has better built quality, greater functionality?
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– FNB48: USB 3.0 connectors, relatively low quality components, Android app, magic smoke.
– WEB-U2: USB 2.0 connectors, relatively good quality components, average reliability, Android app.
– FL001: USB-A 2.0 connectors, USB-C 3.0 connectors, relatively OK components, PC and Mac software, not so good FW.
– KT002: USB-A 2.0 or 3.0 connectors, USB-C 3.0 connectors, relatively good quality components, relatively rich software resources.
FNB48 is for people who are new to this and want something that seems to work but don’t intend to spend too much on it.
WEB-U2 is for people who are new to this and want something decent.
FL001 is for people who have only a Mac.
KT002 is for people who know what they’re doing and want to do more with it.
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Can you help with parts needed for bluetooth module?
from your picture i can see
HM-10
Switch (dont really need this, i’ll jumper to always on)
Resistor ( dont know the value)
and 2 other things near bluetooth Logo, what is this?
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@Bucky
The slide switch is HSW4112-010019, but indeed you can short it;
The resistor is 330 Ohm;
Two side-emitting blue LEDs are for the logo, but you can use normal 1206 LEDs instead;
To connect the board (GND+VCC+RX+TX) you either need four 4mm pogo pins.
While you’re at it, the TFT side can be augmented as well, with 4 red 0805 leds and a 220 Ohm resistor. Two more pogo pins are needed here (for GND+VCC).
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Thank you for the part list, i manage to build this module.
but still have some issue, after change HM10 BT Name to QWAY_U2_XXX and the baudrate, i can see this listed on QWAY Android app, but it doesn’t transmit any data.
same result when tried to debug using another apps (from another site/blog).
current config for the BT Module is :
Baudrate : 115200
Name : QWAY_U2_XXX (XXX last serial number)
Did somebody know whats the problem?
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1. connect HM-10 to PC UART (3.3V logic level and power supply)
-verify connection with AT command
2. change device name
-download HM-10 firmware HMSoft-10-2541-V549-LongName.zip
from http://www.huamaosoft.com/download_rom_en.asp?id=1
-other firmwares have device name limited to 13 chars which is too short
-upgrade/downgrade firmware following instructions in HowToUpgradeFirmware_en.pdf
-connect to HM-10 and change device name to QWAY-U2-123456 with AT+NAMEQWAY-U2-123456
command where 123456 is QWAY-U2 serial number
-verify new name with AT+NAME?
2. update firmware to the latest (or at least to V606) to fix PIN bug
-download HMSoft-10-2541-V709.zip (it is actualy v710)
-upgrade FW
3. change baudrate
-connect to HM-10 and change baudrate to 115200bps with AT+BAUD4
-reconnect HM-10
-try to pair HM-10 and Android device
-if it cannot pair, try to change bond mode with AT+TYPE2 or AT+TYPE3
or change PIN with AT+PASS000000 if necessary (6 digits, choose yours)
4. assebmle HM-10 and QWAY-U2
5. setup QWAY-U2
-plug USB cable to USB HID port on QWAY-U2, press and hold M button and connect cable to PC
-enter into “06 Serial Data Upload” and enable it
-exit setup mode
6. install witrn_20210226_V1.3.apk or newer to Android device
-start app, give permission to storage, BT and location
-tap buton right to WITRN caption, it should find BT device
-tap button on the right of device name and address
-pair devices (enter PIN)
-tap button on the right (not the middle one)
-tap on ENGINE START button (round one), it should work!
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Do you have the necessary files to perform an update? Because the download links on the Huamaosoft site are broken. Could you provide these files?
1. HowToUpgradeFirmware_en.pdf
2. HMSoft-10-2541-V549-LongName.zip
3. HMSoft-10-2541-V709.zip
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@sleeventi and others
Alternate link for firmware:
http://www.jnhuamao.cn/download_rom_en.asp?id=
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Последняя версия софта 4.6 на анг. и прошивка 7.8. Скачать можно тут: https://www.dropbox.com/s/w5orz0t8vuo24cv/WITRN_Software%204.6%20F7.8%20ENG.rar?dl=0
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Спасибо, что поделился.
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Thanks for all the information in one place.
The language file for the pc software is very useful. Sadly there is no English version of the manual anywhere yet (or that I could find)
I received my U2P today, and it comes with firmware version 7.8 🙂
The app direct link is broken as stated, but the link to the rar works. For me, the app loaded but did not show anything except the header. The menu button did not expand either. 😦
Has anyone been able to pair/connect with this meter via bluetooth?
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APK download link is broken
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Check the link named RAR.
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where did you get Firmware v8.0 featured in: https://usbchargingblog.wordpress.com/2020/08/17/ravpower-pd-pioneer-90w-gan-tech-type-c-2-port-wall-charger-rp-pc128-review/
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It’s insider firmware gotten from the developer, still buggy particularly when powered by a stand-alone power supply. Don’t know when it will be publicly available.
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v8.0 looks good with support for PPS detection lets hope its stable enough for a public release soon.
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great news!
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Also, Does PD-Trigger support PD3.0? or it’s PD2.0 only?
Does the Tester named “FNB38” supports QC3.0 to PD and PD3.0 Trigger?
I’m gonna buy one of these, what do you recommend??
Sorry for my bad English;-)
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No, your English is better than mine. 🙂 PD-Trigger supports both PD 3.0 and PD 2.0. FNB38 supports QC2.0 to PD and PD 3.0/2.0 trigger, but QC2.0 to PD does not always work even if your charger supports QC2.0.
– I’m gonna buy one of these, what do you recommend??
It depends on what you’re looking for.
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Thanks for reply 🙂
As I read your reviews about FNB38 and U2, every official features are same except for monitoring graph with PC and screen size. I’m gonna use tester for monitoring my device’s charging speed, check protocols of my chargers, and sometimes use PD trigger and Qc to PD. I don’t require very accurate voltage and current value.
In this situation, what tester do you recommend? Does the bugs of FNB88 firmware now fixed in v1.3?(or will it be fixed?)
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According to your needs, the U2 seems to be a slightly better choice for now.
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Can I trigger QC3.0 to PD signal with this? the I only see the menu for QC2.0.
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No but QC2.0 to PD. However, if you charger supports QC3.0, it should support QC2.0 as well.
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