Warning: If you use this with a quickcharge charger that most cell phones are using these days, please cut the solder jumper located on the bottom side of the OLED Backpack. Failure to do so will risk damaging the backpack due to an over-voltage condition. These quick chargers are able to go over 5V. There is no protection on the USB Tester OLED Backpack.
The USB Tester makes it easy to monitor the current and voltage of any USB device. It is inserted inline between your USB device and your power source or computer. This allows you to make sure you are getting a true 5V and to read how much power your project\device is using. For example, you can check which charger/cable allows your phone to charge the fastest. The base can be used with a Digital Multi Meter or with the Backpack, you can see the readout directly on the display. The default mode shows a graph of current usage, with the button cycling through the different modes.
The OLED Backpack can connect to a computer either using the Java app or the wizkers.io Chrome app. Both can graph and log the data which can be export as a CSV file. Wizkers is easier to setup and can handle firmware updates.
Button Location on the front left
128x64 OLED Display
Voltage monitoring of the USB Data lines
Easier access to almost all the extra GPIO’s
Separated voltage test points (Easier to attach test clips and avoid misplacing jumper)
Standard Dual Banana spacing 0.75in
Standard test probe sized test points
mWh and mAh tracking
Bar Graph of volts, watts and current
JSON for serial communications
Uses JSON over serial
Save as CSV
We’d like to thank Ed for all of his help and contributions.
Source\Design Files Backpack: https://github.com/FriedCircuits/FC-USB-Tester-OLED-Backpack
Design Files USB Tester: https://github.com/FriedCircuits/FC-USB-Tester-v1
Wizkers.io Chrome App: http://wizkers.io
Android App: Android Play Store
Java Data Logging App: https://github.com/FriedCircuits/FC-USB-Tester-Data-Logger-App
INA219B Datasheet: http://friedcircuits.us/image/data/Datasheets/ina219.pdf