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----
-title: Getting started with MicroPython and ESP8266
-url: esp8266-and-micropython-guide.html
-date: 2020-09-06T12:00:00+02:00
-draft: false
----
-
-## Introduction
-
-A while ago I bought some
-[ESP8266](https://www.espressif.com/en/products/socs/esp8266) and
-[ESP32](https://www.espressif.com/en/products/socs/esp32) dev boards to play
-around with and I finally found a project to try it out.
-
-For my project, I used [ESP32](https://www.espressif.com/en/products/socs/esp32)
-but I could easily choose
-[ESP8266](https://www.espressif.com/en/products/socs/esp8266).  This guide
-contains which tools I use and how I prepared my workspace to code for
-[ESP8266](https://www.espressif.com/en/products/socs/esp8266).
-
-![ESP8266 and ESP32 boards](/assets/esp8366-micropython/boards.jpg)
-
-This guide covers:
-
-- flashing SOC
-- install proper tooling
-- deploying a simple script
-
-> Make sure that you are using **a good USB cable**. I had some problems with
-mine and once I replaced it everything started to work.
-
-## Flashing the SOC
-
-Plug your ESP8266 to USB port and check if the device was recognized with
-executing `dmesg | grep ch341-uart`.
-
-Then check if the device is available under `/dev/` by running `ls
-/dev/ttyUSB*`.
-
-> **Linux users**: if a device is not available be sure you are in `dialout` 
-> group. You can check this by executing `groups $USER`. You can add a user to
-> `dialout` group with `sudo adduser $USER dialout`.
-
-After these conditions are meet go to the navigate to
-[https://micropython.org/download/esp8266/](https://micropython.org/download/esp8266/)
-and download `esp8266-20200902-v1.13.bin`.
-
-```sh
-mkdir esp8266-test
-cd esp8266-test
-
-wget https://micropython.org/resources/firmware/esp8266-20200902-v1.13.bin
-```
-
-After obtaining firmware we will need some tooling to flash the firmware to the
-board.
-
-```sh
-sudo pip3 install esptool
-```
-
-You can read more about `esptool` at
-[https://github.com/espressif/esptool/](https://github.com/espressif/esptool/).
-
-Before flashing the firmware we need to erase the flash on device. Substitute
-`USB0` with the device listed in output of `ls /dev/ttyUSB*`.
-
-```sh
-esptool.py --port /dev/ttyUSB0 erase_flash
-```
-
-If flash was successfully erased it is now time to flash the new firmware to it.
-
-```sh
-esptool.py --port /dev/ttyUSB0 --baud 460800 write_flash --flash_size=detect 0 esp8266-20200902-v1.13.bin
-```
-
-If everything went ok you can try accessing MicroPython REPL with ` screen
-/dev/ttyUSB0 115200` or `picocom /dev/ttyUSB0 -b115200`.
-
-> Sometimes you will need to press `ENTER` in `screen` or `picocom` to access 
-> REPL.
-
-When you are in REPL you can test if all is working properly following steps.
-
-```py
-> import machine
-> machine.freq()
-```
-
-This should output a number representing a frequency of the CPU (mine was
-`80000000`).
-
-When you are in `screen` or `picocom` these can help you a bit.
-
-| Key      | Command              |
-| -------- | -------------------- |
-| CTRL+d   | preforms soft reboot |
-| CTRL+a x | exits picocom        |
-| CTRL+a \ | exits screen         |
-
-
-## Install better tooling
-
-Now, to make our lives a little bit easier there are couple of additional tools
-that will make this whole experience a little more bearable.
-
-There are twq cool ways of uploading local files to SOC flash.
-
-- ampy → [https://github.com/scientifichackers/ampy](https://github.com/scientifichackers/ampy)
-- rshell → [https://github.com/dhylands/rshell](https://github.com/dhylands/rshell)
-
-### ampy
-
-```bash
-# installing ampy
-sudo pip3 install adafruit-ampy
-```
-
-Listed below are some common commands I used.
-
-```bash
-
-# uploads file to flash
-ampy --delay 2 --port /dev/ttyUSB0 put boot.py
-
-# lists file on flash
-ampy --delay 2 --port /dev/ttyUSB0 ls
-
-# outputs contents of file on flash
-ampy --delay 2 --port /dev/ttyUSB0 cat boot.py
-```
-
-> I added `delay` of 2 seconds because I had problems with executing commands.
-
-### rshell
-
-Even though `ampy` is a cool tool I opted with `rshell` in the end since it's
-much more polished and feature rich.
-
-```bash
-# installing ampy
-sudo pip3 install rshell
-```
-
-Now that `rshell` is installed we can connect to the board.
-
-```bash
-rshell --buffer-size=30 -p /dev/ttyUSB0 -a
-```
-
-This will open a shell inside bash and from here you can execute multiple
-commands. You can check what is supported with `help` once you are inside of a
-shell.
-
-```bash
-m@turing ~/Junk/esp8266-test
-$ rshell --buffer-size=30 -p /dev/ttyUSB0 -a
-
-Using buffer-size of 30
-Connecting to /dev/ttyUSB0 (buffer-size 30)...
-Trying to connect to REPL  connected
-Testing if ubinascii.unhexlify exists ... Y
-Retrieving root directories ... /boot.py/
-Setting time ... Sep 06, 2020 23:54:28
-Evaluating board_name ... pyboard
-Retrieving time epoch ... Jan 01, 2000
-Welcome to rshell. Use Control-D (or the exit command) to exit rshell.
-/home/m/Junk/esp8266-test> help
-
-Documented commands (type help <topic>):
-========================================
-args    cat  connect  date  edit  filesize  help  mkdir  rm     shell
-boards  cd   cp       echo  exit  filetype  ls    repl   rsync
-
-Use Control-D (or the exit command) to exit rshell.
-```
-
-> Inside a shell `ls` will display list of files on your machine. To get list 
-> of files on flash folder `/pyboard` is remapped inside the shell. To list files
-> on flash you must perform `ls /pyboard`.
-
-#### Moving files to flash
-
-To avoid copying files all the time I used `rsync` function from the inside of
-`rshell`.
-
-```bash
-rsync . /pyboard
-```
-
-#### Executing scripts
-
-It is a pain to continuously reboot the device to trigger `/pyboard/boot.py` and
-there is a better way of testing local scripts on remote device.
-
-Lets assume we have `src/freq.py` file that displays CPU frequency of a remote
-device.
-
-```py
-# src/freq.py
-
-import machine
-print(machine.freq())
-```
-
-Now lets upload this and execute it.
-
-```bash
-# syncs files to remove device
-rsync ./src /pyboard
-
-# goes into REPL
-repl
-
-# we import file by importing it without .py extension and this will run the script
-> import freq
-
-# CTRL+x will exit REPL
-```
-
-## Additional resources
-
-- https://randomnerdtutorials.com/getting-started-micropython-esp32-esp8266/
-- http://docs.micropython.org/en/latest/esp8266/quickref.html