This instructables show how to use ESP8266 and 25 LEDs to create an IoT LED Sign.
Step 1: Preparation
SK6812 SMD5050 x 25
WeMos D1 Mini Pro
0.5 mm uncoated wire
3D print: http://www.thingiverse.com/thing:2135569
- 3 short coated wire to connect between ESP8266 and LED
- some tape for insulation
- M1 screw x 4
Step 2: LED Matrix Assembly
This LED matrix design used zigzag pattern and rotated all SMD 30 degree to reduce soldering point. Each pixel only 6.4 mm apart, it is highest density SMD5050 LED matrix I ever seen. Please read the data sheet carefully before plug the SMD in the 3D model, the first LED out point touch second LED in point. Each row have different direction, row 1, 3 and 5 have same direction, row 2 and 4 rotated 180 degree.
After place the LEDs, follow the 3D model pit cut the wire and push it in.
Step 3: ESP8266 Board Assembly
Plug the WeMos D1 Mini Pro board to the 3D model, done!
Step 4: Soldering Work
Soldering all touch point, each LED soldering 3 - 4 points. Some LED may fail in high temperature, so I suggest test after finished soldering each LED. After soldering all 25 LEDs and tested ok, soldering to the ESP8266 board:
ESP 5V -> LED +ve
ESP GND -> LED -ve
ESP D4 -> LED in
Step 5: Screw Up
Screw up with the M1 screw.
Step 6: Flash NodeMCU WebIDE
Step 7: Happy Programming!
led-sign.html and led-sign.lua are only a very simple example show what you can done in NodeMCU WebIDE. You may browser other sample and edit your own code over WiFi with your mobile!