WiFi robot

ESP8266 chip on Wemos D1 mini module that is driving two DC geared motors using L293D chip. One WS2812 led for status, one tact switch for reset. Possibility of extending functionality via I2C bus. Firmware contains Blynk platform integration for mobile app control. Can also be controlled using UDP packets.

More resources:

• 3D prints
• Firmware
  • Original - uses Arduino core for ESP8266, using Blynk platform
  • Tester - testing sketch
• Hardware assembly
• PCB drawings - created in EAGLE 9.2

Setup

On your computer

• Install Arduino core for ESP8266 - use version 2.4.2 or above
• Install the Blynk Arduino library
• Install the WiFi Manager library
• Compile and upload the firmware

On your mobile phone

• Install Blynk app
• Create account or log in
• Create new empty project in Blynk App
• Copy auth token from the app or your email
• Connect to the robot AP
• Wait for WiFi login popup (or use browser and navigate to http://192.168.4.1)
• Enter WiFi credentials and auth token
• Setup the Blynk project (see next section)

Reconfiguring or resetting robot

• Hold button until status LED lights up with violet color
• Connect to the robot AP
• Wait for WiFi login popup (or use browser and navigate to http://192.168.4.1)
• Enter WiFi credentials and auth token

Blynk project

Total required energy: 1200

Components

• Joystick
• Button
• zeRGBa
• Level H

Recommended layout:

Component settings