Esp01 Datasheet -

| Feature | Datasheet Says | What You Actually Need To Know | |---------|----------------|--------------------------------| | Boot Mode | "GPIO0 low = flash mode" | Also need GPIO2 high, no external load on RST during power-on. | | Power Supply | "3.0V-3.6V" | Needs 500mA peak, low-ESR capacitor (≥10µF + 0.1µF) at VCC pin. | | Reset | Active low pulse >100µs | Also requires stable VCC before releasing reset. | | Antenna Keep-out | "Keep copper clear" | Also keep plastic enclosures >5mm away – detuning kills range. |

When the ESP-01 first appeared on markets like eBay and AliExpress around 2014, it was essentially a "black box". The initial datasheets were primarily in Chinese, and the module was marketed as a simple . It was intended to be a cheap accessory that gave an Arduino internet access via AT commands. 2. The Great Revelation esp01 datasheet

– Functional but dangerously incomplete. | Feature | Datasheet Says | What You