Microswitch

With this micropython code, a microcontroller with micropython support and an rf sender you can automatically switch sockets on a timer.

The configuration is hosted on a website, so you can change parameters without flashing the microcontroller.

my Hardware

• ESP-WROOM-32 board with USB and Wi-Fi
• FS1000A 433MHz transmitter
• breadboard 10x25
• 3 cables

Installation

• copy config_local.py.sample to config_local.py and change the settings
• copy config.py.sample to config.py and change the settings
• push config.py to a webpage (github pages or gist?)
• install MicroPython on your microcontroller
• flash *.py to your microcontroller (except config.py)
• connect to the microcontroller REPL shell and install mcron:

import network
wifi = network.WLAN(network.STA_IF)
wifi.active(True)
wifi.connect("SSID", "PASSWORD")

ìmport upip
upip.install("micropython-mcron")

Advanced

Sun

You can use basic sundown/sunrise calculation instead of a constant time. ("sunset", -1, 30) triggers 1.5 hours before sunset. If the calculated time is after midnight (or before 00:00 with sunrise) it will likely fail!

Manual override

If you sometimes want to switch your appliances manually you can do so with added buttons:

• connect one leg of the button to 3.3V
• connect the other leg to a GPIO (I use 18, 19 and 21 for 3 buttons)
• add the GPIO to the switch config (switches["xxx"]["button"] = 18 for GPIO 18)
• send your config to the device

The buttons are initialised as off on reboot and the state is toggled when you press the button and set when an appliance is automatically switched. There is a delay of around 1 second before something happens.