If you want to have control over other devices through Internet, mobile phone. You want to measure temperature, humidity or collect data from an environment - the PRODINo ESP32 3G Ethernet is the device that you find. The device microprocessor include 2 cores with 32 bits architecture. The board can connect through WiFi, Ethernet, GSM and Bluetooth Low Energy protocols.
The PRODINo ESP32 3G Ethernet has 4 relays. The 4 Relays are a solution for driving high power loads that cannot be controlled by digital IOs of microcontroller. Due to the current and voltage limits of the controller. Each relay provides 2 pole changeover contacts (NO and NC). Relays are useful in switching on/off AC appliances like fan, light, motor or high current DC actuators like solenoid valve etc. Every relay includes a LED which indicate the on/off state.
The 4 digital inputs are optical isolated. This is helpful for connecting your PRODINo ESP32 3G Ethernet to a system with a different ground, different voltage or some noisy channel. This separate electrically (isolates) input channel from the controller input. Four LEDs indicate the On/Off state of each input.
1 x RGB multi-functional led. You can use it for some statuses information 1 x Power 4 x Input On/Off for every optical isolated input 4 X Relay On/Off for every relay output