6.S063 Engineering Interactive Technologies (fall 2017)

HW2: Setup your micro-controller

Deadline: due Wednesday (September 13, 2017) at 1pm, upload here

  • short video (use your smart phone) showing how you upload the python code to the micro-controller using your computer console and how as a result the micro-controller's blue LED lights up, upload video here
  • post on piazza
  • go to a TA office hour for building/coding oriented questions (tbd)
  • go to an instructor office hour for logistical questions and grading (mondays, 4-5pm, 32-211)
  • do not send us emails

Setup your micro controller so you can upload code via MicroPython from your computer.
You are done when the blue light on the micro-controller blinks.

Setup How-To for Mac (Stefanie Mueller, on OSX Yosemite)
  • Install the latest Python if not already (Python 3.4 or later)
  • Follow this tutorial. Some tips below:
  • I had to reduce the baud rate otherwise I got an error (they use 460800, I used 9600 to be safe)
    • esptool.py --port /dev/cu.wchusbserial1410 --baud 9600 write_flash --flash_size=detect 0 esp8266-20170108-v1.8.7.bin
  • If the upload is successful, go to your terminal. Use the screen command like this:
    • screen /dev/cu.wchusbserial1410 115200 –L
    • This time baud rate 115200 worked for me, but in case it doesn't you can reduce it again.
    • If you see weird signs or an empty screen, press enter a couple of times until you see the >>> for the python command line.
    • Enter your python code for the LED.
  • Sometimes the Microcontroller port can be found in /dev/cu.*, e.g. try ls /dev/cu.* and ls /dev/tty.* when looking for your microcontroller. Generally it should be named "/dev/cu.wchusbserialXXXX" or "/dev/tty.wchusbserialXXXX"
  • For some Macs, the microcontroller won't show up anywhere. In this case, you may need to install the appropriate driver for CH340G, here.
  • If you still have issues, ask on Piazza.
Setup How-To for Windows (Jared Counts, on Windows 10)
  • Install the latest Python if not already (Python 3.4 or later)
  • Follow this tutorial. Some tips below:
  • The article suggests that COM4 would be the port of your NodeMCU. If that doesn't work, you can find the correct port by doing the following:
    1. Make sure the USB is connected fully.
    2. Open up Device Manager (Windows key, type "Device Manager", hit enter)
    3. Expand "Ports (COM & LPT)"
    4. Under Ports, look for "USB-SERIAL CH340 (...)". The port is specified in the parentheses here (usually COM1, or COM2, etc.)
  • If the prompt (">>>") on your serial terminal does not show up, or all you see is gibberish, you can try a few things:
    • Press enter a few times. Also try Ctrl+C a few times.
    • Restart the terminal.
    • Try reflashing the chip, but include "-fm dio" as a flag. E.g.: esptool.py --port COM4 --baud 460800 write_flash -fm dio --flash_size=detect 0 esp8266-20170108-v1.8.7.bin
  • If nothing shows up in the command prompt when running esptool.py, then you may need to call the script using python manually.
    • E.g. python esptool.py ..., instead of esptool.py ...
  • If you still have issues, ask on Piazza.