Features

• Onboard mature and stable ESP32-WROOM-32E module with large capacity 4M Byte Flash;
• The I/O port and UART program download port of ESP32 are accessible to facilitate secondary development;
  
• Onboard ESP32 module I/O-0 programmable button and reset button;
  
• ESP32 supports the use of Arduino IDE development tools;
  
• 4x Onboard 5V relays, output switch signal, suitable for controlling the load with working voltage within AC 250V/DC30V
• WIFI & BLE module, all I/O ports are accessible.
  

Interface introduction

Programming port: GND, RX, TX, 5V of ESP32 are connected to GND, TX RX, 5V of external TTL serial port module respectively. IO-0 needs to be connected to GND when downloading, and then disconnect the connection between I/O-0 and GND after downloading is completed

Relay output:

• NC: Normally closed terminal, the relay is closed with COM before it is pulled in, and it is open after it is pulled in;
  
• COM: Common terminal;
  
• NO: Normally open, the relay is suspended before closing, and close circuited with COM after closing.

Power Supply:

• AC220 / DC5-30V