This folder includes example code for the workshop.
For an overview of the workshop goals see motion-sensor
In this folder you will find:
Basic example to configure 1 IO pin and switch the built in LED on/off.
This is configured with a 1 second delays (1000ms) between each change of state.
There is no other libraries needed other the standard Arduino.h
To upload and run this you should check the following is configured in platformio.ini:
upload_speed = 230400
upload_port = /dev/cu.usbserial-1420
Extending on step1.h this adds the use of the Serial output. This is really only useful
if you have the device plugged into a machine which is monitoring the port.
This configured the port speed to 115200. This should match the configured monitoring baud
rate in platformio.ini:
monitor_speed = 115200
After uploading this, you can use the Serial port monitor in platform io like so:
$ pio device monitor
Extending on step2.h this now adds a dependency on WiFi.h and requires credentials (kept in secrets.h) The secrets.h must configure constants:
ssid
password
These are used to establish a connection to a wireless network. The IP address is sent via the Serial output configured in step2.
Extending on step3.h this now adds a dependency on PubSubClient.h which provides a library to connect to an MQTT broker over the TCP/IP connection established in step3.
This requires the following constants to be configured in secrets.h
local_hostname
mqtt_username
mqtt_passsword
These are used to authenticate with the MQTT broker and publish the devices IP address to the topic /tw/welcome
Extending on step4.h this now integrates reading from the GPIO pin to transmit a message to the MQTT broker. There is no additional configuration or dependencies from this step. To avoid colliding messages, the topic name is dynamic and will send the payload to a topic unique to each device.