Rainbow Lamps — Wireless Synchronized Lamps

6 min readJan 13, 2023

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…..

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Supplies

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3D Design

I have designed this lamps in Autodesk Fusion 360, You can simply download the below .stl files.
You can even modify my design in Fusion 360 software by downloading the Rainbow Lamps File(Click to view the 3D Design in your browser and Download the fusion file).

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

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.

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.

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.

Arduino IDE Setup

First go to File->Preferences->Additional Boards Manager URL and paste the following URL

https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json

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.

rogramming

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.

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)