Domenode

domenode

A CAN bus controlled, WiFi enabled network of dome node LEDs with many features

Features

• :heavy_check_mark: ESP32 microcontroller (WiFi, bluetooth)
  • Pads for both ESP32 standalone module and dev board variants
  • OTA wireless firmware updates
• :heavy_check_mark: SN65HVD230 CAN bus transceiver
• :heavy_check_mark: 2x RJ45 connectors for CAN in and passthrough
• :heavy_check_mark: 5x WS2812/NeoPixel for RGB lighting
• :heavy_check_mark: On-board buck regulator
• :heavy_check_mark: 2x push switches
• :heavy_check_mark: Power and GPIO LED
• :heavy_check_mark: many headers for sensors and attachments (I2C, GPIOs, power etc)
• :red_circle: A shield header for expansion boards (to be added)

Sensors (all optional and do not need to be populated)

Optional features by means of populating those pads are:

• :question: Outer and inner facing LDRs for ambient/transmitted light sensing
• :question: 2x tactile push switches for on-board input
• :question: Heavier duty power RGB LED shield connector (exposes 24V and R,G,B GPIOs)
• :question: IR Tx/Rx and (hopefully!) a ghetto distance sensor
• :question: Speaker
• :question: Capacitive touch
• :question: Microphone - MAX4466 based breakout board connector (footprints could be added to board, alternative idea is I2S)

Firmware notes

• CAN bus - http://www.barth-dev.de/can-driver-esp32/
• NeoPixels - https://www.instructables.com/id/ESP32-Bluetooth-Ambience-Light-Controller-With-WS2/
• Microphone -https://www.hackster.io/julianfschroeter/esp32-voice-streamer-52bd7e , https://github.com/MrBuddyCasino/ESP32_Alexa
• Speaker - http://www.xtronical.com/basics/audio/dacs-on-esp32/
• IR sensor - https://github.com/mdhiggins/ESP8266-HTTP-IR-Blaster
• I2C bus - https://randomnerdtutorials.com/esp32-with-bmp180-barometric-sensor/

BoM and Components

1. Basic functionality and programming

• 1x ESP32 module
• 1x SOT-223 3v3 LDO regulator
• 2x 0603 10uF ceramic capacitors (decoupling)
• 2x 100uF tantalum capacitors (decoupling)
• 1x 4 pin ISP header
• 1x 2 pin SW0 flashing header
• 2x 0805 LED (power and blink)
• 2x 0603 resistors for LEDs (470 and 1k)
• 1x 0603 10k resistor EN (very much needed, R10)

2. NeoPixels

• 9x WS2812 LEDs
• 1x 0603 470 ohm resistor (R13)
• 9x 0603 100nF ceramic capacitors

3. External Power

• 1x MINI-360 buck regulator module (U1)
• 1x 1N5819 protection diode
• 1x 1210 10uF >24v capacitor (C1)
• 2x 0603 10uF ceramic capacitors (C2, C4 decoupling)
• 2x RJ45 connectors

4. CAN Bus

• 1x SN65HVD230DR transceiver IC (U6)
• 1x 2 pin CANTERM header
• 1x 0603 120 ohm resistor (R16)
• 1x 0603 10k resistor (R17)
• 1x 0603 100nF capacitor (C14, decoupling)

Serial Programming

Order is: Black, Green, White, Red (GND), (Rx), (Tx), (5V)

#Flashing Procedure

• 1. Determine COM port with command mode
• 2. Open terminal in esp32 python environment
• 3. esptool --chip esp32 -p COM write_flash -z 0x1000 <firmware_bin>

Uploading files

ampy -p COM put