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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. 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 - 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. 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 ## 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) ![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) ![pic4.jpg](https://raw.githubusercontent.com/wagiminator/ATtiny85-USB-Tester/master/documentation/USB_Tester_pic4.jpg)
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|Current Measurement Resolution|1mA| |Current Measurement Resolution|1mA|
# References, Links and Notes # 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) 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) 3. [INA219 Datasheet](https://www.ti.com/lit/ds/symlink/ina219.pdf)
4. [SSD1306 Datasheet](https://cdn-shop.adafruit.com/datasheets/SSD1306.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) ![pic5.jpg](https://raw.githubusercontent.com/wagiminator/ATtiny85-USB-Tester/master/documentation/USB_Tester_pic5.jpg)