Esp8266 Esp-01 Datasheet Fix 🔥 Direct Link

| Mode | Current | |------|---------| | TX @ 0 dBm | ~120 mA | | TX @ +19.5 dBm | ~170 mA | | RX (WiFi on) | ~60-70 mA | | Modem-sleep | ~15 mA | | Light-sleep | ~1.5 mA | | Deep-sleep | ~10 µA (but ESP-01 has no deep-sleep pin broken out) |

| Problem | Likely Cause | Solution | |---------|--------------|----------| | Module won’t boot | CH_PD floating | Pull CH_PD to VCC with 10kΩ | | Can’t flash firmware | GPIO0 not LOW at reset | Hold button on GPIO0, press RST | | Serial gibberish | Baud rate mismatch | Use 74880 baud for boot messages | | Overheating | 5V applied | Replace module – it’s dead | | GPIO output weak | No external pull-up | Add 4.7k – 10kΩ pull-up |

| Mode | GPIO0 | GPIO2 | GPIO1 (TX) | |------|-------|-------|-------------| | | 0 | 1 | 1 | | Flash Boot (Normal Run) | 1 | 1 | 1 | | SDIO Boot | 0 | 1 | 0 | esp8266 esp-01 datasheet

| Parameter | Value | |-----------|-------| | Frequency range | 2.4 GHz – 2.5 GHz | | Protocols | 802.11 b/g/n (HT20) | | TX power | +19.5 dBm (max) | | RX sensitivity | -98 dBm (11b), -74 dBm (11n) | | WiFi stack | TCP/IP, UDP, HTTP, DNS, SNTP |

If you’ve ever dabbled in IoT or low-cost WiFi-enabled projects, you’ve almost certainly encountered the . It’s the little module that started a revolution. But before you plug it into a breadboard and fry it, let’s take a detailed walk through its official datasheet and extract everything that matters for your projects. | Mode | Current | |------|---------| | TX

The ESP-01 does not break out the GPIO16 pin (RTC wake-up), so deep-sleep is not possible without soldering to the chip itself. For battery operation, consider an ESP-01S or Wemos D1 Mini instead.

The ESP-01 uses an external SPI flash (typically 512KB or 1MB). The flash shares pins with some GPIOs internally, which means: The ESP-01 does not break out the GPIO16

The ESP-01 has an (4 pins on each side). Here’s the correct mapping: