PROJECTS Raspberry Pi

Raspberry Pi 3 Project: SPy Robot

DFRobot Nov 13 2017 261065

network={ ssid=<"SSID"> psk=<"PASSWD"> }

#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>

#include <ESP8266HTTPClient.h>

ESP8266WiFiMulti WiFiMulti;

#define SSID "SSID"
#define PSSWD "PASSWORD"

int pins[3] = {12,13,4};

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  for(int i=0; i<3;i++){
    pinMode(pins[i], INPUT_PULLUP);
  }
  WiFiMulti.addAP(SSID, PSSWD);
}

void loop() {
  // put your main code here, to run repeatedly:
  int motor1, motor2;
  if(digitalRead(pins[0])==0){ //Turn left
    Serial.println("left");
    motor1 = 50;
    motor2 = 50;
  }
  else if(digitalRead(pins[1])==0){ //Go forward
    Serial.println("forward");
    motor1 = 50;
    motor2 = -50;
  }
  else if(digitalRead(pins[2])==0){ //Turn right
    Serial.println("right");
    motor1 = -50;
    motor2 = -50;
  }
  else{
    motor1 = 0;
    motor2 = 0;
  }
  
  if(WiFiMulti.run() == WL_CONNECTED){
    HTTPClient http;
    http.begin("http://<RaspberryPiIP:5000/control/");
    http.addHeader("Content-Type", "application/json");
    int httpCode = http.POST("{\"motor1\":"+String(motor1)+", \"motor2\":"+String(motor2)+"}");
    String payload = http.getString();
    Serial.print('\t');
    Serial.println(httpCode);
    Serial.println(payload);
  }
  delay(40);
}

Raspberry Pi 3 Project: SPy Robot

This raspberry pi 3 project allows you to drive a robot via a webpage and view a livestream. It can be used to spy on pets, make sure nothing is burning in your oven, and even bird watch!

THINGS USED IN THIS PROJECT

2WD miniQ Robot ChassisTexas Instruments Dual H-Bridge motor drivers L293DJumper wires (generic)5v Regulator1800 mAh 11.7V LiPo BatteryESP8266 Thing - Dev BoardSparkFun Pushbutton switch 12mm DFRobot Raspberry Pi 3 DFRobot Raspberry Pi Camera Module

Software apps and online services:

Arduino IDEHand tools and fabrication machines:3D Printer

The Robot Electronics

I began by assembling the 2WD MiniQ chassis kit from DFRobot. I slid the wheels onto the motor shafts, then inserted them into brackets and attached them to the chassis. Finally, I added the metal supports.

Now it was time to build the main board. The L293d motor driver got soldered in place, along with wires running to the Raspberry Pi's GPIO pins. Next, I soldered a connector for the battery, as that will provide the main power. After the power source was added, I installed a 5V regulator.

Setting Up the Pi

Then I saved and ejected the card and put it back into the Raspberry Pi 3. This should now allow for the usage of SSH and connecting to WiFi.

Getting the Camera Ready

By default, the camera is disabled on the Pi, so you must open the terminal type sudo raspi-config to bring up the menu. Go to "interfacing options" and then enable the camera. Now just select "Finish" and insert the ribbon cable of the camera module into the correct area of the Pi.

Installing Software

The Code for the Robot

Controller Code

Running the Raspberry SPy

All that is required is typing sudo python <raspberryspycode>.py ! You should see the camera light up, and by going to the web address of the pi with the port 8080 the stream should be visible. Now you can use the controller anywhere in the house and have a live feed as well.

SCHEMATICS

2WD miniQ Robot Chassis
Texas Instruments Dual H-Bridge motor drivers L293D
Jumper wires (generic)
5v Regulator
1800 mAh 11.7V LiPo Battery
ESP8266 Thing - Dev Board
SparkFun Pushbutton switch 12mm
DFRobot Raspberry Pi 3
DFRobot Raspberry Pi Camera Module

Arduino IDE
Hand tools and fabrication machines:
3D Printer