There is a lot of information on using ESP-WROOM-02 with Arduino, but there is little information on running MicroPython, so I have summarized the procedure up to L Chika. MicroPython MicroPython is a Python3 execution environment that runs on a microcomputer board. Originally, it ran on a microcomputer board called pyboard, but it was also ported to esp8266.
ESP-WROOM-02 Build an environment to write a micropython farm on the board.
Skip if pip is already installed
python
$ curl -O https://bootstrap.pypa.io/get-pip.py
$ sudo python ./get-pip.py
This will install pip.
esptool is a tool to access ESP-WROOM-02 from the command line.
Install using the pip installed above.
$ sudo pip install esptool
This is the only environment construction.
Set IO0 of ESP-WROOM-02 to LOW to enter firmware write mode. Use USB serial to connect to your Mac. The USB serial device will be /dev/tty.usbserial-xxxx. (Xxxx depends on the USB serial device)
Use esptool to test if you can access the board.
$ esptool.py --port=/dev/tty.usbserial-xxxx --baud 115200 chip_id
esptool.py v1.1
Connecting...
Chip ID: 0x000????
If you start esptool and get the above message, you can access the board normally with esptool. (???? changes depending on the chip ID)
Use esptool to check the size of the flash memory.
$ esptool.py --port=/dev/tty.usbserial-DJ00L51M --baud 115200 flash_id
esptool.py v1.1
Connecting...
Manufacturer: a1
Device: 4016
The last two digits of 4016 seem to indicate the size. For 16, the flash size is 32Mbit. I referred to the site of [here](http://flogics.com/wp/2016/09/esp8266-try -nodemcu-firmware and -micropython- /).
The firmware can be found at the bottom of MicroPython Downloads. When I downloaded, esp8266-20160909-v1.8.4.bin was the latest.
$ esptool.py --port=/dev/tty.usbserial-xxxx --baud 115200 write_flash --flash_size=32m 0 ./esp8266-20160909-v1.8.4.bin
esptool.py v1.1
Connecting...
Running Cesanta flasher stub...
Flash params set to 0x0040
Writing 565248 @ 0x0... 565248 (100 %)
Wrote 565248 bytes at 0x0 in 49.0 seconds (92.2 kbit/s)...
Leaving...
If you can write like this, you are successful.
Set IO0 of ESP-WROOM-02 to HIGH, put it in execution mode, and connect to the terminal with the cu command.
$ sudo cu -s 115200 -l /dev/tty.usbserial-xxxx
If you hit return and the > >> prompt appears, the python command line is ready to accept.
hello world
For the time being, hello world
>>> print ('hello world')
hello world
Turn on the LED connected to IO4.
>>> import machine
>>> pin = machine.Pin(4, machine.Pin.OUT)
>>> pin.high()
>>> pin.low()
that's all. The reference URL was MicroPython tutorial for ESP8266.
As a sequel, I summarized the introduction of the shell. Introduction of MicroPython (Mac) shell with ESP-WROOM-02
We also added how to use DeepSleeep in MicroPython and how to get the power supply voltage. MicroPython on the ESP8266 (ESP-WROOM-02) deep sleep MicroPython on the ESP8266 (ESP-WROOM-02) Acquisition of power supply voltage
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