Introduction: MicroPython Basics Using NodeMCU (ESP8266)
MicroPython is a project that allows you to run a miniature version of python 3 on micro controllers and embedded boards. It has a growing support of microcontroller boards and rather than installing a full Linux distro onto the board it only gives a minimized version of python with respect to the board, with a python shell and you can upload small python files on to the board and run it.
In this instructable I will be showing you how to use MicoPython on a NodeMCU, the NodeMCU is a development board based on esp8266-12.
Step 1: Tools and Components
For this project you will need a,
- MicroUSB Cable
Step 2: Installing MicroPython
To install micropython on the esp8266, I'm using the esp8266-12 version board. To install micropython you will need esptool you will need to download and install python and pip, to install the esptool.
Run the below command on a terminal or cmd to install esptool
pip install esptool
Next you can visit micropython website and download the latest firmware for the esp8266, after downloading it open up a terminal in the same directory as the firmware file and then run the below command
esptool.py --port /dev/ttyUSB0 erase_flash
esptool.py --port /dev/ttyUSB0 --baud 460800 write_flash --flash_size=detect 0 esp8266-xxxxx-vxxxx.bin
You will need to change the port based on you PC.
After this you should have successfully installed micropython.
Step 3: Testing Blink
Now that you have successfully installed micopython it is time to try out a few test programs to do this we need to open up the python shell using a serial monitor, I use putty on a windows machine to open up a serial monitor on the com port the esp8266 is assigned to.
This python shell is similar to that of the python 3 shell, run the below script to blink an led connected to the esp8266
import esp pin = machine.Pin(0) pin = machine.Pin(0, machine.Pin.OUT)
Then running the below line of python script will turn on the led and the second line would turn it off.
alternatively you could also run these lines to do the same
Step 4: Using WebREPL
Now lets enable the micropython WebREPL which allows us to upload scripts to the esp8266 over WiFi hence eliminating the need of wires.
First we need to enable WebREPL, open up a serial terminal and execute the below line, this setups the webrepl and asks you to set up a password to improve security.
Next you should see a WiFi access point named MicroPython-xxxxxx, connect to it and open up a internet browser and visit the webREPL webpage. Now you should get a web page, hit connect and enter the password you created. Now you can execute scripts on the esp8266 wireless.
Step 5: Going Further
Now that you got micropython up and running you can execute scripts on it, similar to what you do a raspberry pi. There are a lot of modules available for micropython to work with and you can get a good documentation of it in the micro python official website under esp8266 category.
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I am so lost with this. OK so it says you may need to change --port to whatever port you are using. Like how? --com3 --port3 or what? and exactly where to you put this line? At the command prompt? In the Python shell? I've been trying for 3 days to figure this out before asking but it seem as all the other sites give the same cryptic instructions for a newbie