Wemos LOLIN D32 Pro + SHT30 macOS Setup

To get USB access:

install the USB serial driver, check that you see a /dev/cu.wchusbserial1410 device when plugging in the board over USB

To deploy MicroPython on the board:

get the MicroPython firmware (get the SPIRAM variant to get access to the 4MB of RAM)
install esptool by running sudo pip install esptool
clear the flash by running esptool.py --chip esp32 --port /dev/cu.usbserial-1410 erase_flash
flash MicroPython by running esptool.py --chip esp32 --port /dev/cu.usbserial-1410 --baud 460800 write_flash -z 0x1000 esp32spiram-idf3-20190125-v1.10.bin
access MicroPython by running screen /dev/cu.usbserial-1410 115200
exit screen through CTRL + a then k

To setup a WiFi connection from the MicroPython prompt:

import network
wifi = network.WLAN(network.STA_IF)
wifi.active(True)
wifi.config(dhcp_hostname="Sensor")
wifi.connect("WIFI_NETWORK", "WIFI_PASSWORD")

To read the temperature from the SHT30 sensor board from the MicroPython prompt:

import machine
i2c = machine.I2C(scl=machine.Pin(22), sda=machine.Pin(21))
address = i2c.scan()[0]
i2c.writeto(address, b'\x2C\x10')
data = i2c.readfrom(address, 6)
temperature = (((data[0] << 8 |  data[1]) * 175) / 0xFFFF) - 45
humidity = (((data[3] << 8 | data[4]) * 100.0) / 0xFFFF)
print("%.1f degrees, %.1f%% humidity" % (temperature, humidity))

See the reference SHT30 code for more info.

To deploy Arduino on the board:

download the Arduino IDE
right click on the app and select Open to bypass the app codesigning issues
after Arduino starts, open the Preferences window
in the Additional Board Manager URLs box, enter: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
go to the Tools > Board > Board Manager menu, search for ESP32 and install that package
select LOLIN D32 PRO as your board and /dev/cu.usbserial-1410 as your serial port
click the arrow button to deploy your code to the board

To install esp-idf and use their serial logger:

run git clone --recursive https://github.com/espressif/esp-idf.git
install esp-idf through cd esp-idf ; ./install.sh
set the right environment variables through . ./export.sh
now you can run idf.py monitor

ndfred/D32 Setup.mdown