ARDUINO LED TESTER

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Introduction: ARDUINO LED TESTER

A small LED tester project

I was looking on the NET for an LED tester and after seeing some idea I wanted to build this tester from zero

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Step 1: The Schemat

To test an LED you need a current generator.

The LM317LZ datasheet provides a map, See the basic idea website

https://www.robotroom.com/LED-Tester-Pro-1.html

no code available from this site

the principle therefore is to measure several voltage at the terminals of the LED

VH anode voltage VL cathode voltage and subtract them (VH - VL)

then to measure the voltage at the terminal of the resistance traversed by the current of the LED IL and divided by its value R (VR/R=IL)

Step 2: Code Arduino

For the Arduino code the basic idea was defined I wanted a display on OLED screen

the library is for a ssd1306

For measuring different voltages see

https://www.instructables.com/id/Arduino-OLED-Volt...

http://it-edukacija.eu.hr/multidruino/default.html

To create icons see

http://javl.github.io/image2cpp/

we pass the test on a test board

code here:

// ================================================

// Author: PHILOUPAT
// Mars 2019 // version 1: one buttons, display modes OLED I2C, AREF default // ================================================

// I2C OLED DISPLAY: SCL = A5 , SDA = A4

// A0 input reference for calculation RL

// A1 input Vbat

// A2 input VL

// A7 input VH

// ================================================

#include

#include

#include

#include

#include

#include

#define SSD1306_128_64

#define SCREEN_WIDTH 128

// OLED display width, in pixels

#define SCREEN_HEIGHT 64

// OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)

#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)

#define XPOS 0

#define YPOS 1

#define DELTAY 2

//#if (SSD1306_LCDHEIGHT != 64)

//#endif

const unsigned char PROGMEM batterie [] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xfe, 0x00, 0x20, 0x00, 0x00, 0x02, 0x00, 0x20, 0x00, 0x00, 0x02, 0x00, 0x20, 0x00, 0x00, 0x02, 0x00, 0x20, 0x00, 0x00, 0x03, 0xe0, 0x20, 0x00, 0x00, 0x02, 0x20, 0x24, 0x00, 0x00, 0x82, 0x20, 0x24, 0x00, 0x01, 0xe2, 0x20, 0x24, 0x00, 0x00, 0x82, 0x20, 0x20, 0x00, 0x00, 0x82, 0x20, 0x20, 0x00, 0x00, 0x03, 0xe0, 0x20, 0x00, 0x00, 0x03, 0x00, 0x20, 0x00, 0x00, 0x02, 0x00, 0x20, 0x00, 0x00, 0x02, 0x00, 0x3f, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

const unsigned char PROGMEM resis [] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x00, 0x0f, 0x00, 0x00, 0x00, 0x7f, 0x80, 0x00, 0x3f, 0xf8, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x00, 0x03, 0x80, 0x00, 0x00, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x38, 0x00, 0x00, 0x00, 0x1f, 0x00, 0x00, 0x07, 0xfe, 0x00, 0x00, 0xff, 0x80, 0x00, 0x00, 0x78, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x07, 0x80, 0x00, 0x00, 0x01, 0xe0, 0x00, 0x00, 0x00, 0x78, 0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x3f, 0xf0, 0x00, 0x01, 0xf8, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00, 0x00, 0x1c, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00, 0x01, 0xc0, 0x00, 0x00, 0x00, 0x78, 0x00, 0x00, 0x0f, 0xf8, 0x00, 0x03, 0xff, 0x00, 0x00, 0x03, 0xc0, 0x00, 0x00, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x38, 0x00, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

const unsigned char oms [] PROGMEM = {
0x00, 0x00, 0x00, 0x00, 0x0c, 0x30, 0x18, 0x18, 0x18, 0x0c, 0x30, 0x0c, 0x30, 0x0c, 0x30, 0x0c, 0x30, 0x0c, 0x18, 0x0c, 0x08, 0x18, 0x0c, 0x30, 0x06, 0x30, 0x1e, 0x3c, 0x1c, 0x3c, 0x00, 0x00, 0x00, 0x00 };

const unsigned char PROGMEM led [] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0xe0, 0x00, 0x00, 0x3f, 0xf8, 0x00, 0x00, 0xff, 0xfc, 0x00, 0x00, 0xff, 0xfe, 0x00, 0x01, 0xff, 0xff, 0x00, 0x03, 0xff, 0xff, 0x00, 0x03, 0xff, 0xff, 0x80, 0x03, 0xff, 0xff, 0x80, 0x07, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xc0, 0x07, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xf7, 0xff, 0xf0, 0x1f, 0xff, 0xff, 0xf8, 0x1f, 0xff, 0xff, 0xf8, 0x1f, 0xff, 0xff, 0xf8, 0x1f, 0xff, 0xff, 0xf8, 0x1f, 0xff, 0xff, 0xf8, 0x1f, 0xff, 0xff, 0xf8, 0x0f, 0xcf, 0xfe, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x0e, 0x00, 0x01, 0xe0, 0x0e, 0x00, 0x00, 0xe0, 0x0e, 0x00, 0x01, 0xe0, 0x0e, 0x00, 0x01, 0xe0, 0x0e, 0x00, 0x00, 0xe0, 0x0e, 0x00, 0x01, 0xe0, 0x0e, 0x00, 0x01, 0xe0, 0x0e, 0x00, 0x01, 0xe0, 0x0e, 0x00, 0x00, 0xe0, 0x0e, 0x00, 0x00, 0xe0, 0x0e, 0x00, 0x00, 0xc0, 0x0e, 0x00, 0x00, 0xc0, 0x0c, 0x00, 0x00, 0xc0, 0x04, 0x00, 0x00, 0xc0, 0x0c, 0x00, 0x00, 0xc0, 0x0c, 0x00, 0x00, 0xc0, 0x0c, 0x00, 0x00, 0xc0, 0x0c, 0x00, 0x00, 0xc0, 0x04, 0x00, 0x00, 0x40, 0x04, 0x00, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

const unsigned char accueil [] PROGMEM = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x03, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0xe1, 0xd8, 0xc3, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0xc1, 0xd9, 0x83, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe6, 0xff, 0xf9, 0x83, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc4, 0xe1, 0xb9, 0x83, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc4, 0xf9, 0xb1, 0xa3, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x83, 0xf3, 0x07, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe1, 0x83, 0x73, 0x0f, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x3f, 0xff, 0xf3, 0xf8, 0x02, 0x03, 0xff, 0xff, 0xff, 0x7f, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x3f, 0xff, 0xe3, 0xf8, 0x06, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x3f, 0xff, 0xe3, 0xf1, 0xfc, 0x30, 0xff, 0xff, 0xff, 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0xff, 0xcf, 0xff, 0x80, 0x00, 0x08, 0x07, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xbf, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xf8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xf0, 0xff, 0xff, 0xe0, 0x1c, 0x01, 0xc0, 0xe0, 0x1c, 0x01, 0x0f, 0x18, 0x07, 0xff, 0xff, 0x1f, 0xf0, 0xff, 0xff, 0x80, 0x04, 0x03, 0x00, 0x00, 0x04, 0x01, 0x1f, 0x98, 0x03, 0xff, 0xff, 0x1f, 0xf0, 0xff, 0xff, 0x88, 0x88, 0xfe, 0x1e, 0x00, 0x40, 0xff, 0x1f, 0x90, 0xe1, 0xff, 0xff, 0x1f, 0xf0, 0xff, 0xff, 0x38, 0xf8, 0xfe, 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0xc3, 0xff, 0xff, 0x9f, 0xf9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

int mode=0;
int pause=500;

int RL= 0;

int R1= 10000;

int R2= 10000;

int R3= 47;

float raw= 0;

float val= 0;

float ref= 0;

float vbat=0;

float vin= 0.00;

float voutL= 0.00;

float voutH= 0.00;

float vref= 0.00;

float vled= 0.00;

float vr= 0.00;

float IL= 0.00;

float vinref = 0.00;

float vinbat=0;

void setup()
{

pinMode(5,INPUT_PULLUP);

pinMode(4,INPUT_PULLUP);

pinMode(3,INPUT_PULLUP);

attachInterrupt(1, bouton, FALLING);

// by default, we'll generate the high voltage from the 3.3v line internally! (neat!) display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // initialize with the I2C addr 0x3C (for the 128x32)

}

void loop()
{

voutH = (val * vref) / 1024.0; // see text

voutL = (raw * vref)/1024.0;

if (voutL>0)

{

if(mode==0) //caracteristique led
{

voutH = (val * vref) / 1024.0; // see text

voutL = (raw * vref)/1024.0;

vled = (voutH-voutL)*(R1+R2)/R2;

vr = voutL;

IL = vr/R3;

display.clearDisplay();

display.setTextColor(WHITE);

display.drawBitmap(96, 0, led, 32, 64, 1);

display.setFont();

display.setFont(&FreeSans9pt7b);

display.setCursor(0,12);

display.print("LED feature");

display.setCursor(0,35);

display.print("VL:");

display.setCursor(28,35);

display.print(vled);

display.setCursor(72,35);

display.print("V");

display.setCursor(0,60);

display.print("IL:");

display.setCursor(28,60);

display.print(IL*1000);

display.setCursor(75,60);

display.print("mA");

display.display();

delay(pause);

}

if(mode==1)
{// resistance

voutH = (val * vref)/1024.0;

voutL = (raw * vref)/1024.0;

vinref = (ref * vref*2)/1024.0;

vled = (voutH-voutL)*(R1+R2)/R2;

IL = voutL/R3;

RL= (vinref-vled)/IL;

display.clearDisplay();

display.drawBitmap(96, 0, resis, 32, 64, 1);

display.setFont();

display.setFont(&FreeSans9pt7b);

display.setCursor(0,12);

display.print("Resistance:");

display.setCursor(0,35);

display.print("Vin:");

display.setCursor(32,35);

display.print(vinref);

display.setCursor(75,35);

display.print("V");

display.setCursor(0,60);

display.print("RL:");

if(RL<0)

{

display.setCursor(30,60);

display.print("empty");

}

else

{

display.setCursor(30,60);

display.print(RL);

display.drawBitmap(73, 46, oms, 15, 15, 1);

}

display.display();

delay(pause);

}

if(mode==2)
{//baterie

vinbat = (vbat*vref*2.3)/1024.0;

isplay.clearDisplay();

display.drawBitmap(90, -2, batterie, 36, 21, 1);

display.setFont();

display.setFont(&FreeSans9pt7b);

display.setCursor(0,14);

display.print("Batterie:");

//display.fillRect(10,35,90,20,WHITE);

//display.fillRect(12,37,88,18,BLACK);

display.drawRoundRect(15, 40, 95, 24, 8, WHITE);

display.setCursor(0,35);

display.print("Vbat:");

display.setCursor(50,35);

display.print(vinbat);

display.setCursor(90,35);

display.print("V");

if(vinbat > 0 && vinbat < 7.0)

{ //one bar

display.fillRect(20,45,10,15,BLACK);

}

else if(vinbat > 7.0 && vinbat < 7.8)

{ //two bar

display.fillRect(20,45,10,15,BLACK);

display.fillRect(30,45,5,15,WHITE);

display.fillRect(35,45,10,15,BLACK);

}

else if(vinbat > 7.8 && vinbat < 8.4)

{ //three bar

display.fillRect(20,45,10,15,BLACK);

display.fillRect(30,45,5,15,WHITE);

display.fillRect(35,45,10,15,BLACK);

display.fillRect(45,45,5,15,WHITE);

display.fillRect(50,45,10,15,BLACK);

}

else if(vinbat > 8.4 && vinbat < 8.7)

{ //four bar

display.fillRect(20,45,10,15,BLACK);

display.fillRect(30,45,5,15,WHITE);

display.fillRect(35,45,10,15,BLACK);

display.fillRect(45,45,5,15,WHITE);

display.fillRect(50,45,10,15,BLACK);

display.fillRect(60,45,5,15,WHITE);

display.fillRect(65,45,10,15,BLACK);

}

else if(vinbat > 8.7 && vinbat < 9.0)

{ //five bar

display.fillRect(20,45,10,15,BLACK);

display.fillRect(30,45,5,15,WHITE);

display.fillRect(35,45,10,15,BLACK);

display.fillRect(45,45,5,15,WHITE);

display.fillRect(50,45,10,15,BLACK);

display.fillRect(60,45,5,15,WHITE);

display.fillRect(65,45,10,15,BLACK);

display.fillRect(75,45,5,15,WHITE);

display.fillRect(80,45,10,15,BLACK);

}

else if(vinbat > 9.0 && vinbat < 9.4)

{

display.fillRect(20,45,10,15,BLACK);

display.fillRect(30,45,5,15,WHITE);

display.fillRect(35,45,10,15,BLACK);

display.fillRect(45,45,5,15,WHITE);

display.fillRect(50,45,10,15,BLACK);

display.fillRect(60,45,5,15,WHITE);

display.fillRect(65,45,10,15,BLACK);

display.fillRect(75,45,5,15,WHITE);

display.fillRect(80,45,10,15,BLACK);

display.fillRect(90,45,5,15,WHITE);

display.fillRect(95,45,10,15,BLACK);

}

display.display(); delay(pause); }

}else

{

display.clearDisplay();

display.drawBitmap(0, 0, accueil, 128, 64, 1);

display.display();

delay(700);

display.display();

delay(1000);

}

}

void bouton()
{

static unsigned long last_interrupt_time = 0;

unsigned long interrupt_time = millis();

// If interrupts come faster than 200ms, assume it's a bounce and ignore

if (interrupt_time - last_interrupt_time > 220) {

mode++;

tone(6,2250,50);

if(mode>2)

mode=0;

}

last_interrupt_time = interrupt_time;

}

{

// Read 1.1V reference against AVcc

// set the reference to Vcc and the measurement to the internal 1.1V reference

#if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);

#elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__) ADMUX = _BV(MUX5) | _BV(MUX0);

#elif defined (__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__) ADMUX = _BV(MUX3) | _BV(MUX2);

#else ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);

#endif

delay(2); // Wait for Vref to settle

long result = (high<<8) | low;

result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000

return result; // Vcc in millivolts

}

Step 3: Realization

Schemat and PCB. I use EAGLES for realize the shem and pcb

a good site for manufacturing

https://jlcpcb.com/

List of the material:

-1 Arduino mini pro 5v

https://www.banggood.com/Wholesale-New-Ver-Pro-Min...

-1 0.96 Inch OLED Module 12864 128x64 Yellow Blue SSD1306 Driver I2C Serial Self-Luminous Display Board for Arduino Raspberry PI or other

warning to polarity Gnd Vcc or Vcc Gnd

https://www.amazon.com/UCTRONICS-SSD1306-Self-Lumi...

https://www.ebay.fr/itm/0-96-I2C-IIC-SPI-Serial-12...

-1 LM317 LZ

https://www.ebay.fr/itm/5Pcs-LM317LZ-LM317L-LM317-...

https://www.amazon.com/LM317LZ-Voltage-Regulator-I...

-1 MCP1702 5V

https://www.ebay.fr/itm/Microchip-MCP1702-500-TO-9...

https://www.amazon.com/5002E-MCP1702-1702-5002E-MC...

-2x10K 2x470K 2x 47R 1/8W

-1x500R variable TSR3386F 3/8

https://www.ebay.fr/itm/Suntan-TSR3386F-3-8-1-turn...

-1x10K varable TSR3386F 3/8

https://www.ebay.fr/itm/Suntan-TSR3386F-3-8-1-turn...

-1xsitch on/off SS12D00G4 SPDT 1P2T 2 Position 3 Pin PCB

https://www.ebay.fr/itm/20pcs-SS12D00G4-SPDT-1P2T-...

-2x 1µF tantale

-3x100nF

-1x1N4148

Possible Power on 9V batterie or batterie lipo 3.7V

-1x3.7V 9V 5V 2A Adjustable Step Up 18650 Lithium Battery Charging Discharge Integrated Module

-1xLIPO batterie 3.7V 400mAh

https://www.ebay.fr/itm/Batterie-403035-Lipo-3-7v-...

To load the code use FTDI

and test with different LEDs and diodes

make the box 3d print

get to thingverse:

https://www.thingiverse.com/thing:3594143

assembled and enjoy

this project uses several software is therefore a good Educational chalenge pcb code 3d electronic calculator etc

Step 5:

Participated in the
Pocket Sized Contest

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