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Simple graphical ammeter based on INA219 current sensor, SSD1306 display and Nucleo-F070RB

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// repository documentation

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# Simple graphical ammeter/powermeter
This project implements a very simple graphical ammeter/powermeter on STM32 devices.

Hardware shopping list:

* [Nucleo-F070RB](http://www.st.com/en/evaluation-tools/nucleo-f070rb.html) or [Nucleo-L432KC](https://www.amazon.it/STM32-St-nucleo-Development-Board/dp/B077GFHLFS). Any other Nucleo board can be easily adapted as STM32 Cube APIs are used
* [INA219 High Side DC Current Sensor Breakout](https://www.adafruit.com/product/904)
* [SSD1306 128x64 display](https://www.adafruit.com/product/938)

Pinout for Nucleo-F070RB board

|Signal        | STM32 IO | Nucleo connector |
|--------------|:--------:|:----------------:| 
| INA219  SCL1 |   PB8    |      CN10-3      | 
| INA219  SDA1 |   PB9    |      CN10-5      |
| SSD1306 SCL2 |   PB10   |      CN10-25     |
| SSD1306 SDA2 |   PB11   |      CN10-18     |

Pinout for Nucleo-L432KC board

|Signal        | STM32 IO | Nucleo connector |
|--------------|:--------:|:----------------:| 
| INA219  SCL1 |   PA9    |      CN3-1       | 
| INA219  SDA1 |   PA10   |      CN3-2       |
| SSD1306 SCL3 |   PA7    |      CN4-6       |
| SSD1306 SDA3 |   PB4    |      CN3-15      |
| Button       |   PA3    |      CN4-10      |

At reset the instantaneous values of current and power are displayed in text form on the display.
When pressing the button a first time, a current measurement is performed at 10kHz and the mean value of the acquisition is displayed.
When pressing the second button a second time, a power measurement acquisition at 10kHz sampling rate is started.
When acqusition is finished, either because the button is released or the interal buffer is filled, the acquired data is displayed.

ammeter

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