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Green PCB development board with ESP8266 module, four relay sockets, screw terminals, micro USB port and pin headers

NuoTo

NuoTo ESP8266 4-Channel Relay Development Board

SKU CH-C7PT-W4R4A

A WiFi 4 development board with four relay channels and exposed programming ports for custom automation projects

  • CPU TypeOther
  • Stable operation across varied tasks with reliable relay performance
  • All ESP8266 download ports exposed for custom firmware development
  • Durable build using quality materials for long-term reliability
  • Professional layout simplifies module replacement and installation
  • Flexible power input supporting AC 90-250 V and DC 7-12 V

Relay development board for ESP8266 projects

This four-channel relay board integrates an ESP8266 module and exposes all program-download pins for custom firmware work. It accepts AC 90-250 V mains through an on-board switching supply or a separate DC 7-12 V input, and a micro-USB port provides a 5 V alternative. Developers and hobbyists building Wi-Fi connected switching hardware will find the bare PCB layout convenient for secondary development.

Thermals noise and power draw in normal use

The board draws only the modest current needed by the ESP8266 and its relay coils during typical switching tasks, so heat output remains low and no active cooling is required. Operation is silent because there are no fans or moving parts beyond the mechanical relay contacts. Power consumption scales with the number of active relays and the chosen supply voltage, staying well within the limits of the on-board AC-DC converter or an external DC source.

Behaviour under sustained load

With all four relays energised continuously the on-board switching supply and relay drivers maintain stable operation without thermal throttling. The ESP8266 maintains its Wi-Fi 4 connection while handling repeated switching cycles, and the exposed GPIO header allows external sensors or watchdog circuits to monitor long-running tasks. Builders needing more than four switched circuits or higher contact ratings will need additional modules or a different board design.

Highlights

  • Stable operation across varied tasks with reliable relay performance
  • All ESP8266 download ports exposed for custom firmware development
  • Durable build using quality materials for long-term reliability
  • Professional layout simplifies module replacement and installation
  • Flexible power input supporting AC 90-250 V and DC 7-12 V

Specifications

CPU TypeOther

Questions about this item

How do I wire the AC power to the L and N terminals safely?

Connect AC 90–250 V to the L and N inputs; the on-board switching supply converts this to 5 V DC for the ESP8266 and relays. Never touch the AC side while powered.

Which parts will need replacement after extended switching cycles?

The four electromechanical relays are the wear items; their contacts degrade with each actuation, so plan to swap the relay modules when switching becomes unreliable.

What limits continuous operation when driving all four channels?

The 5 V regulator that powers the ESP8266 and relay coils from the AC input can overheat under sustained full-load switching, causing thermal shutdown before the relays reach their rated life.

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