Webcam with ESP32-CAM and MicroPython

See http://micropython.org/ for more information on MicroPython.

See https://github.com/tsaarni/micropython-with-esp32-cam/wiki for instructions on how to build custom version of MicroPython for ESP32 with OV2640 camera support.

MicroPython logo is by MicroPython project https://github.com/micropython/micropython/tree/master/logo.

Installation

Install tools on development machine

virtualenv -p python3 venv
. venv/bin/activate
pip install esptool adafruit-ampy pyserial

Install webcam

export AMPY_PORT=/dev/ttyUSB0
ampy put boot.py
ampy put webcam.py

Connect UART to esp32 and start terminal console

miniterm.py /dev/ttyUSB0 115200 --dtr 0   # normal mode

Install dependencies on esp32 by running following on console

import upip
upip.install('picoweb')  # tested with 1.5.2
upip.install('micropython-ulogging')
upip.install('ujson')

Known problems

uasyncio throws exception

Following exception is thrown by uasyncio

Running on http://0.0.0.0:80/
INFO:picoweb:642.000 <HTTPRequest object at 3f819b90> <StreamWriter <socket>> "GET /"
Traceback (most recent call last):\r\n  File "<stdin>", line 25, in <module>
File "/lib/picoweb/__init__.py", line 298, in run
File "/lib/uasyncio/core.py", line 161, in run_forever
File "/lib/uasyncio/core.py", line 136, in run_forever
File "/lib/uasyncio/__init__.py", line 60, in remove_writer
TypeError: function takes 2 positional arguments but 3 were given

workaround is to modify lib/uasyncio/init.py on the target

--- lib/uasyncio/__init__.py.orig       2019-02-17 19:13:41.207015002 +0200
+++ lib/uasyncio/__init__.py    2019-02-17 19:12:33.895297196 +0200
@@ -57,7 +57,7 @@
         # and if that succeeds, yield IOWrite may never be called
         # for that socket, and it will never be added to poller. So,
         # ignore such error.
-        self.poller.unregister(sock, False)
+        self.poller.unregister(sock)

     def wait(self, delay):
         if DEBUG and __debug__: