Circuit Documentation

Summary

This circuit is designed to test the continuity of connections using an Arduino UNO R4 WiFi microcontroller, a 0.96" OLED display, a 16-channel analog multiplexer, and several resistors and banana sockets. The Arduino controls the multiplexer to select different channels and reads the continuity status, displaying the results on the OLED screen.

Component List

1. Arduino UNO R4 WiFi

   • Description: Microcontroller board based on the ATmega328P.
   • Pins: OFF, GND, VRTC, IIC0_SCL, IIC0_SDA, 3V3, GPIO 41, GPIO 0, GPIO 42, GPIO 43, GPIO 44, BOOT, IOREF, RESET, 5V, VIN, A0, A1, A2, A3, A4, A5, RSPCKA, CIPO, COPI, D0/RX, D1/TX, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, AREF, SDA, SCL

2. 0.96" OLED

   • Description: Small OLED display module.
   • Pins: GND, VDD, SCK, SDA

3. GND

   • Description: Ground connection.
   • Pins: GND

4. 16-channel analog multiplexer

   • Description: Multiplexer for selecting one of 16 analog inputs.
   • Pins: GND, VCC, EN, S0, S1, S2, S3, SIG, C0, C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15

5. Resistor (10k Ohms)

   • Description: Resistor with a resistance of 10k Ohms.
   • Pins: pin1, pin2

6. Blue Panel Mount 4mm Banana Socket

   • Description: Blue banana socket for panel mounting.
   • Pins: Blue_Pin

7. Red Panel Mount 4mm Banana Socket

   • Description: Red banana socket for panel mounting.
   • Pins: Red_Pin

Wiring Details

Arduino UNO R4 WiFi

• 3V3 connected to:

  • VDD of 0.96" OLED
  • VCC of 16-channel analog multiplexer
  • Blue_Pin of multiple Blue Panel Mount 4mm Banana Sockets

• GND connected to:

  • GND of 0.96" OLED
  • GND of 16-channel analog multiplexer
  • GND of GND component
  • pin1 of multiple 10k Ohm Resistors

• A0 connected to:

  • SIG of 16-channel analog multiplexer

• D2 connected to:

  • EN of 16-channel analog multiplexer

• D3 connected to:

  • S0 of 16-channel analog multiplexer

• D4 connected to:

  • S1 of 16-channel analog multiplexer

• D5 connected to:

  • S2 of 16-channel analog multiplexer

• D6 connected to:

  • S3 of 16-channel analog multiplexer

• SDA connected to:

  • SDA of 0.96" OLED

• SCL connected to:

  • SCK of 0.96" OLED

0.96" OLED

• VDD connected to:

  • 3V3 of Arduino UNO R4 WiFi

• GND connected to:

  • GND of Arduino UNO R4 WiFi

• SCK connected to:

  • SCL of Arduino UNO R4 WiFi

• SDA connected to:

  • SDA of Arduino UNO R4 WiFi

16-channel analog multiplexer

• VCC connected to:

  • 3V3 of Arduino UNO R4 WiFi

• GND connected to:

  • GND of Arduino UNO R4 WiFi

• EN connected to:

  • D2 of Arduino UNO R4 WiFi

• S0 connected to:

  • D3 of Arduino UNO R4 WiFi

• S1 connected to:

  • D4 of Arduino UNO R4 WiFi

• S2 connected to:

  • D5 of Arduino UNO R4 WiFi

• S3 connected to:

  • D6 of Arduino UNO R4 WiFi

• SIG connected to:

  • A0 of Arduino UNO R4 WiFi

• C0 connected to:

  • pin2 of a 10k Ohm Resistor
  • Red_Pin of a Red Panel Mount 4mm Banana Socket

• C1 connected to:

  • pin2 of a 10k Ohm Resistor
  • Red_Pin of a Red Panel Mount 4mm Banana Socket

• C2 connected to:

  • pin2 of a 10k Ohm Resistor
  • Red_Pin of a Red Panel Mount 4mm Banana Socket

• C3 connected to:

  • pin2 of a 10k Ohm Resistor
  • Red_Pin of a Red Panel Mount 4mm Banana Socket

• C4 connected to:

  • pin2 of a 10k Ohm Resistor

• C5 connected to:

  • pin2 of a 10k Ohm Resistor
  • Red_Pin of multiple Red Panel Mount 4mm Banana Sockets

• C6 connected to:

  • pin2 of a 10k Ohm Resistor
  • Red_Pin of a Red Panel Mount 4mm Banana Socket

• C7 connected to:

  • pin2 of a 10k Ohm Resistor
  • Red_Pin of a Red Panel Mount 4mm Banana Socket

• C8 connected to:

  • pin2 of a 10k Ohm Resistor
  • Red_Pin of a Red Panel Mount 4mm Banana Socket

Resistors (10k Ohms)

• pin1 connected to:

  • GND of Arduino UNO R4 WiFi

• pin2 connected to:

  • C0, C1, C2, C3, C4, C5, C6, C7, C8 of 16-channel analog multiplexer
  • Red_Pin of multiple Red Panel Mount 4mm Banana Sockets

Blue Panel Mount 4mm Banana Socket

• Blue_Pin connected to:
  • 3V3 of Arduino UNO R4 WiFi

Red Panel Mount 4mm Banana Socket

• Red_Pin connected to:
  • pin2 of multiple 10k Ohm Resistors
  • C0, C1, C2, C3, C5, C6, C7, C8 of 16-channel analog multiplexer

Code Documentation

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const int buttonPin = 7;
const int muxSIG = A0;
const int muxEN = 2;
const int muxS0 = 3;
const int muxS1 = 4;
const int muxS2 = 5;
const int muxS3 = 6;

bool testing = true; // Startet direkt mit der Messung

void setup() {
  Serial.begin(9600); // Initialisiere die serielle Kommunikation
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(muxEN, OUTPUT);
  pinMode(muxS0, OUTPUT);
  pinMode(muxS1, OUTPUT);
  pinMode(muxS2, OUTPUT);
  pinMode(muxS3, OUTPUT);
  digitalWrite(muxEN, LOW);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.display();
  delay(2000);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Kabeltester");
  display.display();
}

void loop() {
  if (digitalRead(buttonPin) == LOW) {
    delay(50);
    if (digitalRead(buttonPin) == LOW) {
      testing = true; // Setzt die Messung zurück
      while (digitalRead(buttonPin) == LOW);
    }
  }
  if (testing) {
    display.clearDisplay();
    display.setCursor(0, 0);
    display.print("Teste...");
    display.setCursor(0, 10);
    bool allOK = true;

    // Teste Kontinuität zur Masse für jeden Kanal
    for (int i = 0; i < 5; i++) {
      setMuxChannel(i);
      delay