__hot__ | Hw-597 Driver

"Yeah." He exhaled a breath that tasted like the road. "Last I saw her was in the spring, before things... fell apart. Name's Lila. Thought maybe if I kept this— somehow I'd find my way back. Been following leads, bus stations, word of mouth. No luck." His hands trembled just enough that Mara could see the geography of worry etched into his knuckles.

| Symptom | Likely Cause | Solution | |---------|--------------|----------| | Relay always ON regardless of input pin | Input pin floating or not driven LOW | Set pin to OUTPUT, drive LOW to turn ON | | Relay never turns ON | Trying to drive HIGH to activate | Use active-low logic (LOW = ON) | | Relay chatters or doesn't latch | Insufficient supply current or voltage | Use separate 5V supply (do not power from MCU's 5V pin if using both relays simultaneously) | | Module works at 5V but not 3.3V | Transistor base threshold not met | Use a logic level shifter or 5V MCU | hw-597 driver

While usually reliable, some units from third-party sellers may vary in build quality. Name's Lila

"Got a license?" she asked.

Example (handler outline):