WifiCar

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WiFiCar setup

Nodemcu wificar L293D.png

It is not simple to setup the WiFiCar with the provided software. You should have good knowledge of network handling, and Arduino and C programming.

  1. Install the Arduino IDE (Integrated Development Environment) and the ESP8266 plugin Links #17 for programming the NodeMCU.
  2. With Arduino IDE upload my program wifi-car-AP.ino (Access Point mode) to the NodeMCU of the car.
  3. Power Up the NodeMCU, and try to find the WiFi hotspot (name: wifi-car) on IP address 192.168.4.1.
  4. Upload the provided JavaSript program wifi-carAP.js to the NodeMCU, via the URL http://192.168.4.1/upload (you will be asked for the File name/path).
  5. With an Android Smartphone connect with WLAN to the WiFicar Hotspot (name: wifi-car).
  6. Enter in your Web browser the URL http://192.168.4.1 . A HTML file is loaded (embedded in the C program) and the Java script file is loaded and executed.
  7. As soon, as you tilt the smartphone, the WiFicar will move in that direction.
  8. You should be able to see the interface similar to the right.


Board Pin setup

The WiFi-car signals are also mentioned.

  • Main Control Pin
Functio Description PWM_A Motor PWM_B Dir_A Dir_B EN RST 3V3 GND
NodeMCU Pin D1 D2 D3 D4 EN RST 3V3 GND
ESP8266 Pin IO4 IO5 IO0 IO2 EN RST 3V3 GND
  • On Board Configuration
Other Pin VM A+, A- B+, B- VIN
Description
  • Motor Power Supply Only
  • You can power motor alone
  • (VM): 4.5V ~ 36V
Motor Control A Motor Control B
  • Power for Motor or|and Nodemcu Board
  • Select by switch and jumper
  • (VIN): 4.5V ~ 9V (10VMAX), If motor power over 9V, you should use VM power alone, otherwise will burn
  • Switch and jumper setup
Configuration Description
Jumper ( VIN->VM<-NC) Select VIN power for Motor VM power or not
Switch (VIN->NodeMCU) Turn on / off power for control board nodemcu or not
  • Not used Pin
Lead out pin - digital IO Lead out pin - analog IO Lead out pin - digital IO SPI
D0, D5-D8 A0, AD SD2, SD3 SD1, CMD, SD0, CLK
IO16, IO 14,12,13,15 Analog sampling input, and output (=A0/330*100) IO9, IO10 -

Shield Setup

  • Motor power supply (VM): 4.5V ~ 36V, can be powered separately
  • Nodemcu Control power (VIN): 4.5V ~ 9V (10VMAX), can be powered separately
  • Logic Operating current Iss: ≤60mA (Vi = L), ≤22mA (Vi = H)
  • Driver IC: L293, drive = PWM (Pulse Wide Modulation)
  • Drive part of the work current Io: ≤1.2A
  • Maximum power dissipation: 4W (T = 90 ℃)
  • Control signal input level: High: 2.3V≤VIH≤VIN; Low: -0.3V≤VIL≤1.5V
  • ESP12E Dev Kit Control Port:
  • GPIO0: Motor DirA, Button FLASH; GPIO5: Motor PWMA
  • GPIO2: Motor DirB; GPIO4: Motor PWMB
  • The screw terminal is labeled with the signal names.
  • The push button switch connects VIN to the board.


Reference