Key Array

Documentation Index

Fetch the complete documentation index at: https://learn.pcbcupid.com/llms.txt

Use this file to discover all available pages before exploring further.

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Pins Configuration

• VCC – Power supply (3.3V or 5V).
• GND – Ground.
• OUT1 – Digital signal from Button 1.
• OUT2 – Digital signal from Button 2.
• OUT3 – Digital signal from Button 3.

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Key Features

• Three independent push buttons on a single module.
• Designed with clear labeling for Button 1, Button 2, Button 3.
• Each button typically connected with a pull-down/pull-up resistor (depending on design).
• Standard 4-pin/5-pin header for easy interfacing.

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Applications

• Menu navigation (Up/Down/Select).
• Multi-option input control.
• Mode/Function selector in DIY electronics.
• Robotics control panels.
• Educational and prototyping projects.

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Step 1: Hardware Required

1. Glyph Boards
2. 1×3 Push Button Module

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Step 2: Circuit Diagram

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Step 3: Code Setup

1. Open Arduino IDE.
2. Make sure to install the library
3. Copy and paste the following code into the Arduino IDE:

// Define pins (each button shares the same pin as its LED)
int ledButton1 = 6;
int ledButton2 = 10;
int ledButton3 = 7;

void setup() {
  Serial.begin(9600);
}

void loop() {
  // --- Button 1 ---
  pinMode(ledButton1, INPUT);
  int state1 = digitalRead(ledButton1);
  if (state1 == HIGH) {
    Serial.println("Button 1 pressed → LED1 ON");
    pinMode(ledButton1, OUTPUT);
    digitalWrite(ledButton1, HIGH);
  } else {
    Serial.println("Button 1 not pressed → LED1 OFF");
    pinMode(ledButton1, OUTPUT);
    digitalWrite(ledButton1, LOW);
  }

  // --- Button 2 ---
  pinMode(ledButton2, INPUT);
  int state2 = digitalRead(ledButton2);
  if (state2 == HIGH) {
    Serial.println("Button 2 pressed → LED2 ON");
    pinMode(ledButton2, OUTPUT);
    digitalWrite(ledButton2, HIGH);
  } else {
    Serial.println("Button 2 not pressed → LED2 OFF");
    pinMode(ledButton2, OUTPUT);
    digitalWrite(ledButton2, LOW);
  }

  // --- Button 3 ---
  pinMode(ledButton3, INPUT);
  int state3 = digitalRead(ledButton3);
  if (state3 == HIGH) {
    Serial.println("Button 3 pressed → LED3 ON");
    pinMode(ledButton3, OUTPUT);
    digitalWrite(ledButton3, HIGH);
  } else {
    Serial.println("Button 3 not pressed → LED3 OFF");
    pinMode(ledButton3, OUTPUT);
    digitalWrite(ledButton3, LOW);
  }

  delay(100);
}

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Step 4: Upload the Code

1. Connect the Board
   • Connect your GLYPH board to your computer
2. Select the Board and Port Do the following settings in your Arduino IDE,
   • Tools > Board > esp32 > Pcbcupid GLYPH C3
3. Upload the Code
   • Click the upload button (➡️ icon) or use the shortcut CRTL + U in Arduino IDE to upload the code to the board.

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Step 5: Observe the Output

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Pins Configuration

• VCC - Power supply (3.3V / 5V)
• GND - Ground
• KEY (Analog Output) – Analog signal representing the pressed button

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Key Features

• Six tactile switches on a single board
• Single analog output (KEY pin) for detecting all buttons
• Resistor ladder network design reduces GPIO usage
• Compatible with 3.3V and 5V microcontrollers
• Compact and easy-to-interface module
• Cost-effective solution for multi-button input systems

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Applications

• Menu navigation systems
• Mode selection in embedded devices
• Human–Machine Interface (HMI) controls
• IoT device configuration panels
• DIY electronics and prototyping projects
• Educational learning kits for ADC-based input handling

​

Step 1: Hardware Required

1. Glyph Boards
2. 1×6 Push Button Module

​

Step 2: Circuit Diagram

​

Step 3: Code Setup

1. Open Arduino IDE.
2. Make sure to install the library
3. Copy and paste the following code into the Arduino IDE:

#define KEY_PIN A2   // Analog pin

void setup() {
  Serial.begin(115200);
}

// Detect button from ADC value
int getButtonFromAnalog(int val) {
  if (val > 4000) return -1;          // No button pressed
  else if (val < 200) return 1;       // K1 (around 20)
  else if (val < 2700) return 2;      // K2 (around 2269)
  else if (val < 3200) return 3;      // K3 (around 3034)
  else if (val < 3600) return 4;      // K4 (around 3440)
  else if (val < 3800) return 5;      // K5 (around 3704)
  else return 6;                      // K6 (around 3880)
}

void loop() {
  int analogValue = analogRead(KEY_PIN);
  int button = getButtonFromAnalog(analogValue);

  if (button != -1) {
    Serial.print("Button ");
    Serial.print(button);
    Serial.println(" pressed");
    delay(300);  // debounce
  }
}

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Step 4: Upload the Code

1. Connect the Board
   • Connect your GLYPH board to your computer
2. Select the Board and Port Do the following settings in your Arduino IDE,
   • Tools > Board > esp32 > Pcbcupid GLYPH C3
3. Upload the Code
   • Click the upload button (➡️ icon) or use the shortcut CRTL + U in Arduino IDE to upload the code to the board.

​

Step 5: Observe the Output