Differences

This shows you the differences between two versions of the page.

--- web-u2 [2019/09/02 21:41] – created kingkevin
+++ web-u2 [2019/09/09 11:21] – [Resources] kingkevin
@@ Line 1: / Line 1: @@
 The U2 is a USB power meter and tester.
-It is full of features and makes it the most complete I known of:
+{{:u2:qway-u2p_device_front.jpg?0x200|}}
+{{:u2:qway-u2p_device_back.jpg?0x200|}}
+===== Overview =====
+==== Features ====
+It is full of features and makes it the most complete USB power meter I known of:
   * wide voltage and current range, with high precision: 0-24 V DC @ 0.00001 V, -5-5 A  @ 0.00001 A (covers all standardized USB voltages and currents)
   * multiple USB inputs (USB 3.1 type-A plug, micro-USB, USB-C) and outputs (USB 3.1 type A socket, USB-C)
-  * large clear LCD screen
+  * large (1.77 in / 4.5 cm) clear (can use large fonts) LCD screen (160*128 pixels)
-  * can detect charger compliance/profile: Apple 2.4A, QC 2.0, QC 3.0, QC 4.0, BC, PD 2.0, PD 3.0, MTK, Huawei, ...
+  * can detect charger compliance/profile: Apple (5V @ 2.4A, PD), Samsung (5V @ 2.0A, AFC), USB Battery Charging (BC1.2 DCP), Qualcomm Quick Charge (QC 2.0, QC 3.0), USB Power Delivery (PD 2.0, PD 3.0, E-Marker), Huawei (FCP, SCP), MTK (PE1.1, PE2.0), OPPO (VOOC, DASH, Super, FLASH)
-  * external power input: to not affect the current measurement, the device can be powered using the micro-USB HID power. This also allows to measure voltages under 4 V (the minimum required if you power using the normal USB port
+  * external power input: to not affect the current measurement, the device can be powered using the micro-USB HID plug. This also allows to measure voltages under 4 V (the minimum required if you power using the normal USB port)
   * computer interface to read the measured values: USB HIB (micro-USB port which also can externally power the device), and Bluetooth (U2p version)
+==== Resources ====
+The manufacturer is called **WITRN**.
+The device was first called **WEB-U2**, but now they registered the trademark/brand **Qway** to fight piracy.
+You can buy the [[https://item.taobao.com/item.htm?id=577382740997|device]] from the official store [[https://witrn.world.taobao.com/|witrn]] on taoboa.
+The software also points to the probably authorized re-seller [[https://gzut.world.taobao.com/|GUZt]].\\
+The manual warms about the [[https://www.aliexpress.com/item/4000086513742.html|clones]] from [[https://atorch.aliexpress.com/store/2949143|ATORCH]].
+The [[http://www.witrn.com/|official website]] is rather empty.
+It only point to the user guide  and software (with broken link).\\
+Instead they recommend to follow the QQ group 313755927.
+Here links I could gather to get the latest version of:
+  * [[http://www.witrn.com/witrn/u2/WEB-U2_userguide.pdf|user guide]] ({{ :u2:web-u2_userguide_v3.6.pdf |archive}}, {{ :u2:web-u2_userguide_v3.6.zh-cn.en.pdf | translated}})
+  * [[http://www.witrn.com/witrn/u2/WITRN_Software.zip|PC software]]
+  * [[http://www.witrn.com/witrn/APP/Qway_USBAPP.apk|Android App]]
+  * [[http://www.witrn.com/witrn/u2/U2_Firmware.zip|Firmware]]
+There is also this thorough [[https://diykitsblog.com/obzory-i-testy/u2-usb-tester-witrn.html|review]] and [[https://mysku.ru/blog/aliexpress/67123.html|another]] with a lot of information in the comments.
+===== Hardware =====
+There are several versions of the hardware.
+==== WITRN U2 104083 ====
+This is the first device I bought from the [[https://www.aliexpress.com/store/2022043|HiDANCE store]], and seems to be a [[https://usbchargingblog.wordpress.com/2019/03/09/alert-fake-u2-upms-have-quietly-entered-the-market/|clone]].
+{{:u2:web-u2_device_top.jpg?0x200|}}
+{{:u2:web-u2_device_bottom.jpg?0x200|}}
+{{:u2:web-u2_middle_bottom.jpg?0x200|}}
+The original manufacturer blocked this device.
+After flashing firmware version 5.5, the display would just show ''104083 ERR'', and the device would not work anymore.
+Moreover it was not possible to re-flash it anymore.
+Thus **don't install firmware version 5.5 of later if you have a device with serial 104083**, else you will brick it.
+Software version 4.0 or later also do not work with this device. You need to use version 3.0.\\
+This device can still be used to measure voltage and current, but since there is no update anymore it will not be able to be used to detect charger profiles.
+I read out the FRAM (where the settings are stored) but did not find the serial number in there.
+I also cleared it to confirm the serial is not stored in the FRAM, but in the firmware.
+Sadly the firmware is read protected.
+There is also a footprint for an Bluetooth adapter behind the screen, but it was not placed yet (the software was probably not ready).
+{{:u2:web-u2_middle_top.jpg?0x150|}}
+==== WITRN U2 V2.0 ====
+Because the clone was bricked, I got a genuine replacement.
+{{:u2:witrn-u2_device_front.jpg?0x200|}}
+{{:u2:witrn-u2_device_back.jpg?0x200|}}
+{{:u2:witrn-u2_board-middle_back.jpg?0x200|}}
+A Bluetooth module could be placed on the front side of the bottom board.
+The front board could also be light bz LEDs from the back side.
+{{:u2:witrn-u2_board-bottom_front.jpg?0x150|}}
+{{:u2:witrn-u2_board-top_back.jpg?0x150|}}
+==== Qway U2p ====
+The U2p version is a variant of the U2 with 4 button instead of 2, and a switch to enable Power Delivery probing
+{{:u2:qway-u2p_device_front.jpg?0x200|}}
+{{:u2:qway-u2p_device_back.jpg?0x200|}}
+{{:u2:qway-u2p_middle_back.jpg?0x200|}}
+Finally it was also possible to get a version with Bluetooth and some light next to the USB input (not sure when it is on though)
+{{:u2:qway-u2p_bottom_front.jpg?0x150|}}
+{{:u2:qway-u2p_top_back.jpg?0x150|}}
+===== Software =====
+===== Support =====
+===== Communication =====
+==== USB HID ====
+==== Bluetooth Serial ====