These code snippets can be used to interact with various modules connected to an esp8266. distance.py uses the sr04 most of the umqtt based code snippets are geared towards the tm1638 which you can 'shift out' data into the display. There are also a couple snippets which use a simple button switch. One pub_button.py publishes a message each time you press the button. The other button_pulse.py measures the amount of time a button is pressed and displays the result via the repl.