#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
int analogInput = 0;
float vout = 0.0;
float vin = 0.0;
float R1 = 10000.0; // resistance of R1 (100K) -see text!
float R2 = 2200.0; // resistance of R2 (2.2K) - see text!
int value = 0;
int mode = 0;
int interval = 300;
// Tracks the time since last event fired
unsigned long previousMillis = 0;
int analogPin = 0;
int raw = 0;
int Vin = 5;
float Vout = 0;
float R11 = 1000;
float R22 = 0;
float buffer = 0;
void setup() {
Serial.begin(9600);
pinMode(analogInput, INPUT);
pinMode(9, OUTPUT);
pinMode(7, INPUT_PULLUP);
digitalWrite(9, HIGH);
delay(40);
digitalWrite(9, LOW);
pinMode(13, OUTPUT);
if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
Serial.println(F("SSD1306 allocation failed"));
for (;;); // Don't proceed, loop forever
}
}
void update_display(String val)
{
}
void loop()
{
unsigned long currentMillis = millis();
if ((unsigned long)(currentMillis - previousMillis) >= interval) {
if (mode == 0)
{
value = analogRead(A0);
vout = (value * 5.0) / 1024.0; // see text
vin = vout / (R2 / (R1 + R2));
if (vin < 0.09) {
vin = 0.0; //statement to quash undesired reading !
}
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.println("Voltmeter Mode");
display.setTextSize(2);
display.setCursor(10, 12);
display.print((vin));
display.print("V");
display.display();
}
if (mode == 1)
{
value = analogRead(A2);
vout = (value * 5.0) / 1024.0; // see text
vout = 5 - vout;
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.println("Diode/LED Test");
display.setTextSize(2);
display.setCursor(10, 12);
display.print((vout));
display.print(" V");
display.display();
}
if (mode == 2)
{
raw = analogRead(A2);
buffer = raw * Vin;
Vout = (buffer) / 1024.0;
buffer = (Vin / Vout) - 1;
R22 = R11 * buffer;
Serial.print(Vout);
Serial.print("R2: ");
Serial.println(R22);
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.println("OHM Meter Mode");
display.setTextSize(2);
display.setCursor(2, 12);
if (R22 < 1000)
{
display.setCursor(2, 12);
display.print((R22));
display.print(" OHM");
}
else
{
display.setCursor(10, 12);
display.print((R22 / 1000));
display.print(" K");
}
display.display();
//delay(300);
}
if (mode == 3)
{
raw = analogRead(A2);
buffer = raw * Vin;
Vout = (buffer) / 1024.0;
buffer = (Vin / Vout) - 1;
R22 = R11 * buffer;
Serial.print(Vout);
Serial.print("R2: ");
Serial.println(R22);
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.println("continuity Test Mode");
display.setTextSize(2);
display.setCursor(2, 12);
display.print((R22));
display.print(" OHM");
display.display();
if(R22 < 100)
{
digitalWrite(9, HIGH);
}
else
{
digitalWrite(9, LOW);
}
}
previousMillis = currentMillis;
}
// Use the snapshot to set track time until next event
//previousMillis = currentMillis;
if (digitalRead(7) == LOW)
{
delay(150);
mode++;
if (mode >= 4)
mode = 0;
Serial.println(mode);
}
}