Getting Started With the ESP8266 ESP 12

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Getting Started with the ESP8266 ESP-12 by ankitdaf on February 12, 2015

Table of Contents

Getting Started with the ESP8266 ESP-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Intro: Getting Started with the ESP8266 ESP-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Step 1: Breakout the ESP8266 ESP-12 onto a perforated board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Step 2: Add power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Step 3: Make the connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Step 4: Plug in your CP2102 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Step 5: Open a Serial Terminal Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Step 6: 6: Setup the Communication Communication parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Step 7: Post your data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Step 8: And done ! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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http://www.instructables.com/id/Getting-Started-with-the-ESP8266-ESP-12/

Intro: Getting Started with the ESP8266 ESP-12 This instructable will cover the basic steps t hat you need to follow to get started with the ESP8266 ESP-12. A lot of this content is already out there, but I had a hard time getting everything i n place, and the different tutorials can cause a great deal of confusion, which i s why I have tried to make the simplest setup possible. Specifically, this instructable will cover how to make the ESP-12 behave as a WiFi client by connecting to your home wireless network and how to send sensor data ( we will send random numbers to test, and will not really be covering sensors in this instructable) to a Thingspeak channel. The following are the materials we will be using : 1. ESP8266 ESP-12 module 2. CP2102 USB to UART Serial module 3. LM1117 3.3V Voltage Regulator 4. Jumper Wires 5. 5V Power adapter

Step 1: Breakout the ESP8266 ESP-12 onto a perforated board The ESP-12 has a 2mm pitch, which means you cannot access all the pins on a breadboard or a perforated / dot matrix directly, which have a 2.54mm pitch (distance between adjacent pins). You could use a Xbee adapter board, but there's an easier way out. Take a small length of single strand cable or multi strand cable, and get a spider web breakout like this. I added two rows of pinouts, to make sure the pins were handy. Here's what it looks like.


Step 2: Add power supply Add a power barrel so that you can easily plug in a 5V adapter into your board to power it. This is an optional step, but one that saves you a lot of t rouble later. Connect the terminals of the power connector t o the LM1117 (SMD), so that you have 3.3V output to supply to the ESP8266 ESP-12. It is good practice to add capacitors across the input and output lines, but I am just going to skip that, since this application is very basic and is non-essential. Here is what the board looks like after adding the power connector and the LM1117. The additional jumper wires are so that I can either channel the power from the connector to the LM1117 (if I am using a power source > 3.3V), or directly to theESP-12 (if I am using a 3V power source). This is optional, and you do not need to add this.

Step 3: Make the connections You need to connect a few GPIO pins on the ESP-12 to 3.3V or Ground, to set it in the right mode for communicating with it. Here are the connections you need to make : VCC ----> 3.3V Power supply (Vout of LM1117) GND ----> Ground of power supply CH_PD ----> HIGH (3.3V) GPIO2 ----> HIGH (3.3V) GPIO15 ----> LOW (GND) GPIO0 ----> HIGH (3.3V)


Step 4: Plug in your CP2102 You will now need to plug in your CP2102 to the USB of the computer. The CP2102 is a USB to serial converter that lets us communicate with the ESP-12 over UART. The CP2102 will be detected as a serial device. If you have used a serial device before, you ideally should not need the drivers. I n case you need the drivers, you can find them here : CP2102 Serial VCP (Virtual Communications Port) Drivers The connections between the CP2102 and ESP-12 are straight-forward. CP2102 <--------> ESP-12

Rx <----------------> Tx Tx <----------------> Rx GND <----------------> GND Note : Do NOT connect the 3V3 line from the CP2102 to the ESP-12. The ESP-12 consumes a lot of current, and the USB port is NOT capable of providing that, you are at risk of blowing the USB port if you connect the two.

Alternatively, you can also connect an Arduino Uno 's Rx and Tx lines wit h the CP2102, but you will need to have a voltage divider resistor arrangement t o step down the 5V UART lines from the Uno to the 3.3V needed by the ESP-12, ot herwise you risk damaging the ESP-12.

Step 5: Open a Serial Terminal Depending on your OS, you can download and install a Serial Terminal to communicate with the ESP-12. Here are some popular ones : Linux / Windows: Putty Download Mac: Coolterm Download If you have Arduino IDE installed, you can just use the Serial Monitor present inside. For that, you have to navigate to Tools > Ports , select the Port that the CP2102 was detected on, and then open the Serial Monitor. For the next few steps, we will be using the Arduino Serial Monitor for demonstrating. In the Arduino Serial Monitor, at the bottom right, in the line endings tab, select "Both NL and CR". This inserts a NewLine and CarriageReturn at the end of each command you send, and is necessary for the ESP-12 module to receive and understand your commands. The other terminals should have a similar option in their respective configuration pages.

Step 6: Setup the Communication parameters First, to check if the module has been recognised and is accepting commands, just briefly connect the "REST" pin of the ESP-12 to ground, using a jumper. This resets the ESP-12 and you should see something like the screenshot if this works well. Next, we run the following set of commands in the Serial Terminal: 1. AT This is just a hello message, and if the ESP-12 is in the corr ect mode, it will r eturn an "OK" message. 2. AT+GMR This command returns the firmware version currently on the chip. 3. AT+CWMODE? This command returns the mode of operation. I f the mode is not 3, we will change it to 3 using the following command : AT+CWMODE=3


This mode makes the ESP8266 behave both as a WiFi client as well as a WiFi Access point. 4. AT+CWLAP The LAP (List Access Points) lists the WiFi networks around. Next, we choose our WiFi network 5. AT+CWJAP="your_network_name","your_wifi_network_password" This command JAP (Join Access Point) makes the ESP-12 join your WiFi Network. 6. AT+CIFSR This command returns the IP address of t he ESP-12 as the second line and the gateway IP address as the first line if it managed to connect successfully.

Step 7: Post your data Next, we just post our data to Thingspeak. For now, we will be posting made up numbers, which you can replace with sensor data if you are using an Arduino Uno or some other micro-controller with the ESP-12, or once you progress to using the ESP-12 with your own custom firmware. You need to sign up for an account at Thingspeak, set up a channel, but to make the process simpler, I am just going to include my access key for Thingspeak, so you can send data right away to test your modules and view it too. You can view the data you posted here : Commands : AT+CIPSTART="TCP","api.thingspeak.com", 80

The above line opens a connection with api.thingspeak.com on Port 80, to send an HTTP GET request with our data AT+CIPSEND=70

The above line specifies the number of bytes that are going to be sent as a part of the request. The length is the length of the line below, plus 4 bytes for the CR,NL (Carriage Return and New Line) that the Serial Terminal always inserts at the end of a command. If the size is not correct, you will get an error. Once you enter that, you will see the " > " symbol in the window, which means you are now ready to send the actual data. Enter the line below, with the numbers you desire, and press Enter. Then press Enter one more time. GET /update?api_key=QNI517W61UOC40KF&field1=12&field2=19&field3=94

The above three commands effectively call the URL http://api.thingspeak.com/update?api_key=QNI517W61UOC40KF&field1=12&field2=19&field3=94 The api_key is necessary for authentication, and field1, field2, field3 are the data fields for our example. You can now go and view the data you just posted at the link here : Sensor data on Daflabs Test Channel on Thingspeak


Step 8: And done ! Congratulations, you are now done ! You have just posted some data to the web using the ESP-12 and GET requests. You could extend this by adding some sensors to an Arduino Uno and interfacing it with the ESP-12, and automate the entire process of sensing and updating data. What you effectively have here is an Arduino Yun (minus the Linux) for a mere $5 more ! For a tutorial on how t o use the Arduino with the ESP-12 and the code for uploading sensor data, you can visit here: An IoT project with ESP8266 and Arduino

Related Instructables

An inexpensive IoT enabler using ESP8266 by gopinath.marappa

Blink for ESP8266 native, like arduino using Windows by jbeemster

A newbie's guide to setup ESP8266 with Arduino Mega 2560 or Uno by shinteo

Use ESP8266 to Internet enabled AC Appliances by shinteo

ESP8266 WiFi temperature and humidity sensor by EasyIoT

Low cost WIFI temperature (DS18B20) data logger based on ESP8266 with connectivity to thingspeak.com by ok1cdj

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Comments 9 comments

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AmitabhS says:

Feb 16, 2015. 10:18 PM REPLY

Hi Ankit, Nice post and very helpful for a beginner like me. 1. The picture in step 3 is completely dark. I cannot see any connection. Can you please repost the picture. 2. What is the command t o read gpio pins on this E-12 module and then send the data to the cloud? Thanks in advance. Amitabh

ankitdaf says: 1. Reposted pictures 2. Will post a tutorial on this soon.


Feb 17, 2015. 10:23 AM REPLY

AmitabhS says:

Feb 17, 2015. 9:50 PM REPLY

Thanks.. the picture is clear now.. Wait ing impatiently for your tutorial on reading gpio pins and posting to cloud.

gruv2ths says:

Feb 16, 2015. 9:54 AM REPLY Thanks for this info! Having been struggling with the -12. My problem is clearly the setup op GPOI2, GPIO15 and GPIO0. I had all of them floating. So my question is this, for everyday use of this chip once final firmware is programmed, do you have to hard wir e these pins like you show, making them unavailable to use? Thanks again!

ankitdaf says:

Feb 16, 2015. 10:11 AM REPLY No, you don't. GPIO2 and GPIO0 are required to be connected as shown only while uploading fi rmware. Otherwise, they must be disconnected otherwise they will always be in "firmware flash" mode and won't run the code you flashed.

gruv2ths says:

Feb 16, 2015. 11:21 AM REPLY

Thanks for your quick reply! I am still confused, sorry! So then connected like this(below, copied from above), wont I be in 'run' mode, where I can test the chip with AT commands like you have described? VCC ----> 3.3V Power supply (Vout of LM1117) GND ----> Ground of power supply CH_PD ----> HIGH (3.3V) GPIO2 ----> HIGH (3.3V) GPIO15 ----> LOW (GND) GPIO0 ----> HIGH (3.3V) Also, Don't we need GPIO0 grounded to get the thing in program mode? Is this stuff in the datasheet? Thanks!

ankitdaf says:

Feb 17, 2015. 10:22 AM REPLY Not sure if it is in the datasheets, but it is in the build instructions on https://github.com/esp8266/esp8266-wiki/wiki/Uplo... GPIO0 - > LOW and GPIO2 -> HIGH puts in programming mode. Leaving those floating puts the chip in run mode.

gruv2ths says:

Feb 17, 2015. 1:13 PM REPLY

Thank you sir!

gruv2ths says: Did your ESP-12 come with some version of firmware already on it, or do they come blank? Thanks!


Feb 17, 2015. 8:24 AM REPLY

Getting Started With the ESP8266 ESP 12

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