Rainbow Lamps

About the project

ESP NOW Base Wireless Synchronized Lamps

Items used in this project

Hardware components

White Filament White Filament https://amzn.to/3iaFv5N x 1
Screws Kit Screws Kit https://amzn.to/3ZbKPq6 x 1
Lithium Ion Battery Lithium Ion Battery https://robocraze.com/products/3-7v-2600mah-li-ion-battery x 5
Push Switch Push Switch https://amzn.to/3X3co37 x 5
Touch Sensor Touch Sensor https://amzn.to/3QdbK0J x 5
DFRobot Neopixel 16 RGB LED Ring DFRobot Neopixel 16 RGB LED Ring https://www.dfrobot.com/product-2541.html x 5
DFRobot Beetle ESP32-C3 DFRobot Beetle ESP32-C3 https://www.dfrobot.com/product-2566.html x 5
Purple Filament Purple Filament https://amzn.to/3ClStV4 x 1

View all

Software apps and online services

Solder Wire, Lead Free Solder Wire, Lead Free
Arduino IDE Arduino IDE


Rainbow Lamps

Rainbow Lights are ESP32-C3 based RGB lamps which are synchronised using ESP-Now Communication Protocol. The Lamps are designed in #fusion360 and 3D printed in #ender3. #Adafruits 16LED Neopixels rings are used in these lamps.

The basic functionality of these lamps is to be in wireless sync and change the colours according to the program. So currently I have programed them in two modes:

Mode 1: When we touch any one coloured lamp, all the lamps glow in that colour, stay for 2 seconds and go back to their original colour.

Mode 2: In second mode the colour we touched stays as long as power shutdown or unless we touch any other lamp.

We can use this lamps as Childrens Play Lamps, Mood Lamps, Photo/Videography, Background fill lights and more.....

Thank You NextPCB:

This project is successfully completed because of the help and support from NextPCB. NextPCB is one of the most experienced PCB manufacturers in Global, has specialized in the PCB and assembly industry for over 15 years. Not only could NextPCB provide the most innovative printed circuit boards and assembly technologies in the highest quality standards, the fastest delivery turnaround as fast as 24 hours.

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Step 1: 3D Design

Fusion360 Design

Step 2: 3D Printing

3D Print the above.stl files:

  • 5x Housing in any color you want
  • 5x Cover in white color filament
  • 5x ESP32-C3-Mount in any color
  • 5x Neopixel-Plate in any color
  • I used Ultimaker Cura for slicing.


  • Layer height: 2mm
  • Print speed: 100
  • No Support
  • Printed on Ender3

Step 3: Soldering
  • Solder the ESP32-C3 Module and Expansion board together using header thats provided in the same pack.
  • Take reference of the image provided above or align the pins naming properly.

Step 4: Connections

  • Connect all the electronic components as shown in the circuit diagram.
  • Make sure everything is connected as per diagram before you power it on.

Step 5: Assembly

  • Place the battery in its holder.
  • Push the Push Switch in its slot use glue if necessary.
  • Place the ESP32C3 Module in its mount and screw them.
  • Put the Neopixel ring in the base plate and use some glue.
  • Stick the Touch sensor on to the Cover.

Step 6: Snap Fit

  • The lamp parts are designed in such a way that they can snap fit together.
  • Align the teeths of the parts correctly and snap them together.
  • The Neopixel Plate can snap fit in the Cover and then the Cover can be snaped on to the Housing.

Step 7: Arduino IDE Setup

  • First go to File->Preferences->Additional Boards Manager URL and paste the following URL
  • Then go to Tools->Board->Board Manager and Search for ESP32 and install it.
  • Go to Sketch->Include Library->Manage Libraries and search for Adafruit NeoPixel and insatll it.

Step 8: Programming

  • Click To Download The Code
  • Open the.ino file in Arduino IDE.
  • You have to change the deviceNo = 1/2/3/4/5 as per your device number.
  • You can change the ClearColor = False, to make the changed colour in stay mode.
//Change This Values
int deviceNo = 1; //Device Number
bool ClearColor = true; //Do you want to clear the broadcast color?
  • Now You have to board type from Tools->Board->ESP32 Arduino->ESP32C3 Dev Module.
  • Selsct the com port number from Tools->Port
  • You can Enable or Disable the Tools->USB CDC On Boot to enable or disable the Serial Monitor. (I prefer disable it unless you are making changes in the code).
  • Click on upload the lamp will glow with a particular color that you have specified as deviceNo.

Step 9: Color Change

  • You can change the colors in the code, I used this simple color picker and copied the RGB color values into the code.
colorWipe(strip.Color(255, 0, 0), 10);  // Red (Device 1)
colorWipe(strip.Color(255, 255, 0), 10); // Yellow (Device 2)
colorWipe(strip.Color(0, 255, 0), 10); // Green (Device 3)
colorWipe(strip.Color(255, 0, 255), 10); // Pink (Device 4)
colorWipe(strip.Color(0, 0, 255), 10); // Blue (Device 5)

Step 10: Charging

  • You can directly charge the battery though ESP32-C3 Modules Type C, since this module have on board charging and overcarge protection feture.


I hope you have fun making this project.

Thank You!

Schematics, diagrams and documents


Circuit Connection



Code Github Repository


Photo of mukesh-sankhla


🧑‍💻Passionate software engineer at Siemens, dedicated to driving digitalization by day. 🧑‍🏭By night, I'm a maker exploring IoT, product design, electronics, CAD, and 3D printing, sharing my projects with the world.


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