Alex Glow
Published

ESP8266 Programming Jig (for ESP-01)

A stable, easy-to-use little proto board for programming this WiFi module over FTDI.

IntermediateFull instructions provided45,552
ESP8266 Programming Jig (for ESP-01)

Things used in this project

Hardware components

FTDI cable
*IMPORTANT*: 3v3 cable!! If yours is 5V, you'll need to regulate power to the VCC and RX pins.
×1
Proto board and jumper wires
I'm using a Pinoccio proto board, because it's teeny-tiny!
×1
Tactile switch
a.k.a. a button
×2
ESP8266 ESP-01
Everything ESP ESP8266 ESP-01
Bought on eBay.
×1

Story

Read more

Schematics

Conceptual diagram

I will upload a Fritzing once I am better with that tool! In the meantime, check out the above pictures and description for how to connect everything.
Schematic

esp-jig.png

• Connections are shown on the top of the board. However, they'll be soldered on the bottom, meaning that it'll look "backwards" from this diagram. Don't get confused!
• Also, the wire connections wouldn't line up well with the FTDI header part. Look at the ground wire for reference: each FTDI wire connects to the pin to its right.
• Finally, although the diagram shows two separate boards, the wires are actually stacked on top of each other. It's just easier to show this way.
Esp jig

Code

esp_webserver_BW.ino

Plain text
The example code – connects to a WiFi network with no password.
/*
 *  This sketch demonstrates how to set up a simple HTTP-like server.
 *  The server will set a GPIO pin depending on the request
 *    http://server_ip/gpio/0 will set the GPIO2 low,
 *    http://server_ip/gpio/1 will set the GPIO2 high
 *  server_ip is the IP address of the ESP8266 module, will be 
 *  printed to Serial when the module is connected.
 */

#include <ESP8266WiFi.h>

const char* ssid = "Brainwash";
const char* password = "";

// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);

void setup() {
  Serial.begin(9600);
  delay(10);

  // prepare GPIO2
  pinMode(2, OUTPUT);
  digitalWrite(2, 0);
  
  // Connect to WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  
  // Start the server
  server.begin();
  Serial.println("Server started");

  // Print the IP address
  Serial.println(WiFi.localIP());
}

void loop() {
  // Check if a client has connected
  WiFiClient client = server.available();
  if (!client) {
    return;
  }
  
  // Wait until the client sends some data
  Serial.println("new client");
  while(!client.available()){
    delay(1);
  }
  
  // Read the first line of the request
  String req = client.readStringUntil('\r');
  Serial.println(req);
  client.flush();
  
  // Match the request
  int val;
  if (req.indexOf("/gpio/0") != -1)
    val = 0;
  else if (req.indexOf("/gpio/1") != -1)
    val = 1;
  else {
    Serial.println("invalid request");
    client.stop();
    return;
  }

  // Set GPIO2 according to the request
  digitalWrite(2, val);
  
  client.flush();

  // Prepare the response
  String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nGPIO is now ";
  s += (val)?"high":"low";
  s += "</html>\n";

  // Send the response to the client
  client.print(s);
  delay(1);
  Serial.println("Client disonnected");

  // The client will actually be disconnected 
  // when the function returns and 'client' object is detroyed
}

Credits

Alex Glow

Alex Glow

78 projects • 751 followers
The Hackster team's resident Hardware Nerd. I like robots, music, EEG, wearables, and languages. FIRST Robotics kid.
Thanks to Jono Spiro.

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