Devlog #1.5(cus i need to go eat): Display Upgrade & 5-Second Safety Hold

Overview

In this update for Teal Tracker, we made a major visual upgrade by ditching the old display setup for a clean OLED layout, fixed input responsiveness, and made accidental resets impossible with a new hold gesture.

Key Updates & Hardware Changes

Hardware Migration (7-Segment Removal):
- Removed: Legacy 12-pin 4-digit 7-segment display module to free up I/O pins and eliminate complex multiplexing routines.
- Added: I2C 0.96” SSD1306 OLED Display (128x64), streamlining control down to just 2 communication pins (SDA/SCL) and enabling a clean graphical UI.
Fixed Input Lag & Missing Taps:
- Stripped out blocking delay() calls in the button loop in favor of non-blocking millis() timing logic.
- Inputs and potentiometer readings are now instantaneous without MCU freezes.
5-Second Hold-to-Reset Requirement:
- Replaced the previous double-tap method on Pin 4 with a strict 5-second hold.
- Eliminates accidental EEPROM resets while preserving a simple single-tap for viewing or configuring savings goals.
Live Progress & Countdown UI:
- Built a custom hold screen on the OLED that displays a real-time countdown (3… 2… 1…) alongside a dynamic progress bar while holding Pin 4.

Current Hardware Configuration

Pin / Component Interface Function 0.96” SSD1306 OLED I2C (A4/A5) Graphical UI, animations, and live feedback Pin 2 (BTN_CONFIRM) Digital Input Single tap to apply value; Hold (>500ms) for auto-repeat Pin 4 (BTN_SECOND) Digital Input Tap (<5s) = Goal Screen; Hold (>=5s) = Reset Budget Pin A0 (POT_PIN) Analog Input Dynamic preset selector (-$50 to +$50) with wake-on-move Pin 3 (BUZZER_PIN) PWM Output Frequency-based audio cues

Next Steps

Add dynamic pitch variation on the buzzer based on whether money is added or subtracted.
Create a goal-reached celebration screen on the OLED.
Look into deep-sleep modes for better battery life.