DIY electronic Hydrometer

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Flashing via Web Interface

Flashing via USB (Windows)

  • download and run: NodeMCU-Flasher
  • download the latest firmware Release from the /releases Folder Folder

    Important: select the Download button to download the file correctly

  • Select the COM port for the Wemos
  • Use the Config tab to select the first .bin file
  • Clicking the Flash button on the operation tab shows a progress bar
  • After a successful Flash, press the RESET key

    Config Mode is active while the LED is blinking at 1s intervals. It can be exited via the Link in the Portal or by waiting for the 5min timeout.

Flashing via USB (Linux)

  • download and unpack the latest version of esptool. Then change directory into the newly unpacked directory, using terminal commands such as:

          tar xf esptool-0.4.12-linux64.tar.gz
          cd esptool-0.4.12-linux64
  • download the latest firmware from the iSpindel Releases page e.g.

  • determine the iSpindel’s device path. This may be found by listing all serial USB devices before and after plugging in the iSpindel e.g. before iSpindel is plugged in:

      ls -l /dev/ttyUSB*
      ls: cannot access '/dev/ttyUSB*': No such file or directory

    now after iSpindel is plugged in:

      ls -l /dev/ttyUSB*
      crw-rw-rw- 1 root dialout 188, 0 Dec 11 23:20 /dev/ttyUSB0

    showing that the iSpindel device name is /dev/ttyUSB0

  • upload the firmware by running the esptool command with the discovered iSpindel device name (/dev/ttyUSB0 in this case):

      ./esptool -vv -cd nodemcu -cb 921600 -cp /dev/ttyUSB0 -ca 0x00000 -cf ./firmware.bin