Noduino NODEC

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Chinese version: Noduino NODEC CN


1 Overview

NODE C.png

  • Super mini, 15.5mm*17.8mm, 1 cent coin size
  • ESP8285, built in 1MB Flash
  • 2nd generation WiFi IoT model, independent WiFi nodes (MCU not necessary)
  • 3.3v power supply
  • Support up to 6 relay, sensor and OLED

2 Quick Start

Link 3.3V power supply (600mA output) to VCC&GND that is on the back of model;


Power on, the model will auto detect Wifi. If there is no available router can be detected, the model will be waiting for network connection. Please follow below indication to connect WiFi.

2.1 Setup WiFi

Make sure that your phone is connected to your WiFi router.

Scan the QR code in WeChat


Coming to below page:


Click "Connecting Network" button:


Enter WiFi password then click "Connect" to complete WiFi connection. (NOTE, this network connection model only apply to 2.4G router, unapplicable for neither 5G router nor Enterprise level security certification.

2.2 Link Device

Complete WiFi connection, WeChat will auto detect linkable devices in current routed environment and list them:


1st device, last 4 letters is the MAC address that can corresponds to the serial port output

Click the 1st device then click the "Link Device" on the bottom of next page. (Note, if this device has been linked, button at the bottom will be "Enter Official Account"

2.3 List device

Following above steps, please click "Enter Official Account" button, all your linked devices will be listed in the menu "Smart Devices" (The second button on the bottom of the page)


2.4 Control Device

The default device name of this quick example is Noduino Ctrl5Relay". Click "Noduino Ctrl5Relay" in the device list page then coming to the control page:


Correspondence of Relay and model pins:

1. GPIO13(D4) control the 1st relay
2. GPIO12(D5) control the 2nd relay (pull up)
3. GPIO14(D6) control the 3rd relay
4. GPIO16(D7) control the 4th relay
5. GPIO4 (D8) control the 5th relay

Turn On/Off Relay in WeChat UI page. Corresponding GPIO will be increase or reduce physically.

3 Application

3.1 Smart Plug

  • AC 85V - 250V Smart Plug
  • ESP8285 inside
  • 250V 10A relay
  • Shell size 53mm x 53mm x 27mm

Open-plug-board-shell.jpg Open-plug-board.jpg

Details: Noduino OpenPlug

3.2 Relay Switch

110V/220V MQTT Power Switch


WeChat Airkiss build-in, mobile remote WiFi smart switch: Noduino_OpenOnoff

3.3 Multi-channel Relay Control

110V/220V WiFi MQTT Relay switch, single channel 250V/10A

Home Automation, Smart Home...


Eagle design documents:

3.4 4-Channle LED Control

R, G, B, W 4-way full color LED controller, MQTT, using the WeChat as the HTML5 front-end to control

OpenLight, 32W MAX




3.5 Curtain Motor Control

  • Clockwise Control
  • Anti-clockwise Control
  • Position Sensor support



4 Pin Interface

Attention: The model only apply to 3.3V power supply !





The default firmware is 5 channel relay control firmware, used GPIO resource:

1. GPIO13(D4) control the 1st relay
2. GPIO12(D5) control the 2nd relay (pull up)
3. GPIO14(D6) control the 3rd relay
4. GPIO16(D7) control the 4th relay
5. GPIO4 (D8) control the 5th relay

6 channel relay control firmware, the 6th channel is: GPIO5 (D9) control the 6th relay

If need to connect sensor with I2C interface, OLED screen etc...GPIO4(D8) and GPIO5(D9) can work as SCL & SDA of I2C, for example:

Although GPIO4 (as SDA) and GPIO5 (as SCL) act as I2C, GPIO12, GPIO13, GPIO14, GPIO15, GPIO16, GPIO0 still work as relay controller

5 Schematic diagram


6 Driving Relay

The model is 3.3V electrical level, a simple peripheral circuit is necessary to drive 5V relay:


Relay recommend HKE HRS3FNH

SI2302 MOSFET pipe can be exchanged by DTC143ECA (remove R1)

This circuit is stable & reliable that has been tested through 1200W inductive load & capacitive load, and mass for mass production。

Multi channel relay control can copy the unit circuit.

7 Push Button & LED

Default Firmware Support:

  • GPIO0 can pick up a button then press to connect ground. Firmware supportable. Short press to reverse all relays situation, long touch to restore factory settings
  • RX receive a blue LED into the ground. Firmware supportable can be used to indicate WiFi situation


8 Power Supply

The supply voltage of model is 3.3V, required current is 200mA, peak current for special case is up to 1A

Rated current of the power supply must be more than 600mA. Insufficient current will cause chip unstable, most oftenly reboot with no reason

Recommend adding 220uF / 470uF capacitor to power output side in response to 1A peak current of the chip

DC-DC chip, recommend AP2112 (5V switch 3.3V,compact size) / AMS1117-3.3 (12V-5V switch 3.3V,high current) / WL2803G

8.1 AMS1117-3.3

  • 1000mA LDO
  • Dropout voltage : 1.1V @ Iout = 800mA load current
  • The quiescent current is typically 5mA
  • Vin MAX = 15V
  • SOT-223-3L package


8.2 WL2803G

Replace AMS1117 to fit low dropout voltage situation

  • 1000mA CMOS LDO
  • Dropout voltage : 260mV @ Iout = 800mA load current
  • The quiescent current is typically 150uA
  • Vin MAX = 6.5V
  • SOT-223-3L package
  • Output 3.3V is marking 2803G**/YYWW [ ** - Voltage code (33: 3.3V), YY - Year code, WW - Week code ]


8.3 AP2112

  • 600mA CMOS LDO
  • Low Dropout Voltage (3.3V): 250mV (Typ.) @ 600mA
  • Low Quiescent Current: 55μA (Typ.)
  • Low Standby Current: 0.01μA (Typ.)
  • Vin MAX = 6.5V
  • Provides SOT-23-5, SOT-89-5, and SOIC-8 packages


8.4 MP1470

Wide input voltage recommend to use MP1470

  • Wide 4.7V-to-16V Operating Input Range
  • Fixed 500kHz Switching Frequency
  • Over-Current Protection and Hiccup
  • Thermal Shutdown
  • Output Adjustable from 0.8V
  • Available in a 6-pin TSOT-23 package


9 Update Firmware

Default firmware that the model upload is WeChat control 5 relay, 6 relay firmware can be write by your own

Bootloader built in, the firmware can be uploaded through the serial port directly

GPIO0 start up is normal; Pull down and then power up the module will automatically enter upgrade mode

9.1 Tools

The programming Interface were in the back of module. Use a 5-pin probe on Dupont line, connected to the USB switch TTL Panel, firmware can be upgrade then.


One USB switch serial port board, we used a FT232RL breakout board / Noduino Falcon board


Wiring as below:

  • USB_GND ------> NODE_GPIO0
  • USB_GND -----> NODE_GND
  • USB_RXD -----> NODE_TX
  • USB_TXD -----> NODE_RX

Last but not least, USB_VCC3.3 -----> NODE_VCC power on, then enter upgrade mode

9.2 Prepare Firmware

Fetch the noduino-sdk

$ git clone --recursive git:// noduino-sdk

Generate toolchain (you need Python 2.7)

$ cd noduino-sdk/toolchain
$ ./


$ cd ../sketch/ctrl6relay
$ make

Noduino SDK usage under different platform please refer to:

9.3 Firmware upload

In sketch/ctrl5relay directory, 'make flash' directly:

$ make produce

Firmware will be uploaded. Number of your serial port might be different in different platform, please confirm the device. For instance, FT232RL board may be identified as COM3 in Windows(check in device manager),then:

$ make produce ESPPORT=COM3

10 FAQ

10.1 RF performance

Appearance test, assure network connection and control normal operation in home environment with WiFi through a wall

If network connection failed many times or drop the line occurs often, please use the oscilloscope to confirm the power supply ripple

In general, send 11N MCS7 packet, power supply ripple must be <80mV. Send 11B packet then power supply ripple must be <120mV

11 Extensive Reading

More Reference