GPIO Simulation
3.3V LOGIC
ESP32
WROOM
ESP32-NodeMCU
Tensilica Xtensa Dual-Core
READY
Addressable LED Array
IDLE
digitalWrite():
Pin:
--
State:
LOW
CYCLE PHASE:
READY
// Pin definitions for digital outputs
const int ledPins[] = {16, 17, 18, 19, 21, 22, 23, 25};
void loop() {
for ( int i = 0; i < 5; i++ ) {
int pin = ledPins[i];
digitalWrite(pin, HIGH);
Serial.printf("Pin %d ON (i = %d)\n", pin, i);
delay(500); }
// Cycle completed. Awaiting restart...
}Internal Processor Registers & Condition Evaluator 32-bit Xtensa ISA
Loop Index (i)
RAM: 0x3FFB0014
0
0b00000000
Data Type:
int (signed 32b)
Condition Check
i < limit
0 < 5
TRUE
Branch Jump:
Continue Loop
Serial Monitor
115200 baud
// Serial ready. Waiting to run...
For-Loop Lifecycle Explained
1
Initialization
Executed once at loop entry. Allocates variable and assigns initial value.
2
Condition Test
Evaluated before every iteration. If true, body runs; if false, loop breaks.
3
Loop Body
The statements inside { } run: GPIO pins toggle, math computes, serial writes happen.
4
Increment
Counter updates (i++). Microcontroller jumps immediately back to step 2.
Loop Presets
Auto Delay
600 ms
Upper Limit (< N)
5
Step Size (i += S)
1
Simulation Activity:
Ready to run. Click Auto Play or Step Forward.
ESP32 Loop Visualizer
Educational Embedded Lab V2.0