How to Use Mtiny ESP8266 ESP-07S: Examples, Pinouts, and Specs

The Mtiny ESP8266 ESP-07S is a versatile and compact Wi-Fi module that enables microcontrollers and other electronic devices to connect to a Wi-Fi network. Based on the popular ESP8266 chipset, this module is designed by Makerlabvn for Internet of Things (IoT) applications, smart home devices, and various DIY electronics projects. It offers a powerful on-board processing and storage capability, which allows it to be integrated in a wide range of applications without the need for an additional microcontroller.

• IoT devices
• Wireless sensor networks
• Smart home automation
• Remote data logging
• Wi-Fi range extenders
• Robotics

• Operating Voltage: 3.0V to 3.6V
• Recommended Operating Voltage: 3.3V
• Operating Current: Average ~80mA
• Wireless Standard: 802.11 b/g/n
• Frequency Range: 2.4 GHz - 2.5 GHz (2400M - 2483.5M)
• Integrated TCP/IP protocol stack
• Flash Memory: 4MB
• Operating Temperature: -40°C to 125°C

1. Power Supply: Connect the VCC pin to a 3.3V power source and the GND pin to the ground.
2. Boot Configuration: Ensure GPIO0 is pulled low if you want to flash a new firmware.
3. Serial Communication: Connect TXD and RXD to a USB-to-Serial converter to communicate with the module.
4. GPIO Usage: Utilize the GPIO pins for interfacing with sensors, actuators, or other modules.
5. Antenna Connection: Connect an external antenna to the antenna pad for improved wireless range.

• Do not exceed the recommended operating voltage of 3.3V.
• Use a stable power supply to prevent unexpected resets.
• Ensure proper decoupling capacitors are placed close to the module to filter noise.
• Avoid placing the module near metal objects or surfaces that may interfere with Wi-Fi signals.
• For flashing firmware or booting, follow the correct GPIO pin states (e.g., GPIO0 must be low for flashing mode).

• Module not booting: Check the power supply and boot configuration pins (GPIO0, GPIO2, and GPIO15).
• Wi-Fi not connecting: Ensure the antenna is properly connected and the Wi-Fi credentials are correct.
• Serial communication failure: Verify the baud rate and that TXD/RXD are not swapped.

• If the module is unresponsive, try a different power supply or check the voltage at VCC.
• For Wi-Fi issues, try moving the module closer to the router or check for sources of interference.
• Use a logic level converter if interfacing with a 5V system to avoid damaging the module.

Q: Can the ESP-07S be used with an Arduino? A: Yes, it can be used with an Arduino by connecting the TX/RX pins and controlling it via AT commands or flashing it with custom firmware.

Q: How do I flash the module? A: To flash the module, connect GPIO0 to GND, reset the module, and use a firmware flashing tool like esptool.py with the correct settings.

Q: What is the default baud rate for the ESP-07S? A: The default baud rate is typically 115200 bps, but it can be changed using AT commands.

Q: How can I extend the Wi-Fi range of the ESP-07S? A: Use an external antenna and ensure it's properly connected to the antenna pad on the module.

#include <ESP8266WiFi.h>

const char* ssid = "yourSSID"; // Replace with your Wi-Fi SSID
const char* password = "yourPASSWORD"; // Replace with your Wi-Fi password

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
}

void loop() {
  // Your code here
}

Note: This example assumes that the ESP-07S has been flashed with an Arduino-compatible firmware like NodeMCU and is being used as a standalone microcontroller. If you're using the ESP-07S with an Arduino UNO, you would typically communicate with it using AT commands over a serial connection.