Serial Monitor Guide

Connecting a device

1. Use Chrome or Edge on desktop and open the tool over HTTPS (or localhost).
2. Plug in your board and choose the baud rate your firmware uses.
3. Click Connect and pick the port in the browser dialog.
4. Incoming data appears in the log. Type in the send box and press Send to write a line (a newline is appended).
5. Click Disconnect before unplugging, or simply unplug — the tool detects it.

Status panel data format

Every received line is shown in the log. Lines that match the status format also update one of the six indicator rows:

STAT<n>:<hhhh>

• n — indicator number, 1 to 6.
• hhhh — exactly four hex digits (0000–FFFF), upper or lower case.
• One status per line, terminated by \n or \r\n. Lines may arrive split across reads; the tool reassembles them.
• LEDs are drawn MSB → LSB: the leftmost LED is bit 15, the rightmost is bit 0.
• Anything else (boot messages, debug prints) is logged and otherwise ignored, so you can mix both.

Examples

STAT1:ABCD   → row 1 = 1010 1011 1100 1101
STAT6:0001   → row 6, only bit 0 lit
stat2:ff00   → row 2, upper byte lit
STAT7:1234   → ignored (no row 7)
STAT1:123    → ignored (needs 4 digits)

Arduino / ESP32 firmware snippet

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

void loop() {
  uint16_t status = readStatusRegister();   // your 16-bit value
  char line[16];
  snprintf(line, sizeof(line), "STAT1:%04X", status);
  Serial.println(line);                     // ends with \r\n
  delay(100);
}

No hardware at hand? The Generate (randomize all) button fills the panel with random values so you can preview the layout.

Troubleshooting