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ATtiny85-USB-Tester
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# USB Power Tester based on ATtiny25/45/85
# USB Power Tester
Simple USB Power Tester based on ATtiny25/45/85 and INA219. The device measures voltage, current, power, energy, capacity and displays the values on an OLED screen. You can switch between different screens by pressing the SET button.
- Project Video (YouTube): https://youtu.be/QKx8Vn_IfjU
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An [INA219](https://www.ti.com/lit/ds/symlink/ina219.pdf) is used to measure voltage and current. The INA219 is a current shunt and power monitor with an I²C-compatible interface. The device monitors both shunt voltage drop and bus supply voltage, with programmable conversion times and filtering. A programmable calibration value, combined with an internal multiplier, enables direct readouts of current in amperes. The selected shunt resistance of 8mΩ enables both a very small influence on the circuit and a measurement with a resolution of 1mA. For an accurate measurement, a shunt resistor with a low tolerance (1% or better) should be selected.
## User Interface
The user interface utilizes two buttons and a [128x64 pixels OLED display](http://aliexpress.com/wholesale?SearchText=128+64+0.96+oled+new+4pin). An [ATtiny24/45/85](https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-2586-AVR-8-bit-Microcontroller-ATtiny25-ATtiny45-ATtiny85_Datasheet.pdf) microcontroller handles the user interface as well as the calculation and display of the values.
The user interface utilizes two buttons and an [SSD1306 128x32 pixels OLED display](http://aliexpress.com/wholesale?SearchText=128+32+0.91+oled). An [ATtiny24/45/85](https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-2586-AVR-8-bit-Microcontroller-ATtiny25-ATtiny45-ATtiny85_Datasheet.pdf) microcontroller handles the user interface as well as the calculation and display of the values.
![pic3.jpg](https://raw.githubusercontent.com/wagiminator/ATtiny85-USB-Tester/master/documentation/USB_Tester_pic3.jpg)
![pic4.jpg](https://raw.githubusercontent.com/wagiminator/ATtiny85-USB-Tester/master/documentation/USB_Tester_pic4.jpg)
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|Current Measurement Resolution|1mA|
# References, Links and Notes
1. [UBS-C Version](https://github.com/wagiminator/ATtiny85-USB-C-Tester)
1. [UBS Type-C Version](https://github.com/wagiminator/ATtiny85-USB-C-Tester)
2. [ATtiny25/45/85 Datasheet](https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-2586-AVR-8-bit-Microcontroller-ATtiny25-ATtiny45-ATtiny85_Datasheet.pdf)
3. [INA219 Datasheet](https://www.ti.com/lit/ds/symlink/ina219.pdf)
4. [SSD1306 Datasheet](https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf)
5. [128x32 OLED on Aliexpress](http://aliexpress.com/wholesale?SearchText=128+32+0.91+oled)
![pic5.jpg](https://raw.githubusercontent.com/wagiminator/ATtiny85-USB-Tester/master/documentation/USB_Tester_pic5.jpg)