The MagSafe 3 cable is an amazing piece of engineering, showing charged as green and charging as amber. Please consider that "carging," and "full" or "reached charging limit," is green, but in case you are far away, you need an estimate of battery percentage. A software magsafe update, like macOS 26.5 was very noticeable for me, as i have the charging limit set on 80%. A new MagSafe 4 would be a simple MagSafe 3 update, adding a yellow colour. it should be simple, here is the code:
// 1. CRITICAL SAFETY CUT-OFF
// If the system detects a hardware/thermal failure,
// it cuts power and pulses RED.
if (criticalError) {
setLED(PULSING_RED);
return;
}
// 2. SLOW CHARGER DETECTION
// Logic: Air < 30W OR Pro < 70W triggers Pulsing Yellow.
if ((isAir() && wattage < 30) || (isPro() && wattage < 70)) {
setLED(PULSING_YELLOW);
return;
}
// 3. CAPACITY GRADIENT
// Simple, clear visual feedback based on your percentages.
if (soc < 50) {
setLED(COLOR_AMBER); // 0-50%
}
else if (soc >= 50 && soc < 90) {
setLED(COLOR_YELLOW); // 50-90%
}
else if (soc >= 90) {
setLED(COLOR_GREEN); // 90-100%
}
