MicroPython Projects

Commanding the sensor node

The command parser that we created earlier has several commands that you will recognize:

• LED1
• LED2
• LED3

We need to send these commands to the sensor node in a JSON formatted string. For example, we can send a message to turn on LED1 by sending the following code line:

{“LED1”: “On”}

We can also turn the same LED off by sending the following code line:

{“LED1”: “Off”}

We are not limited to controlling a single LED at once. For example, we can construct a JSON message that allows us to command all the LEDs at once. If I wanted to turn on LED1 and LED3 while turning LED2 off, I could construct a JSON message that looks like the following:

{“LED1”: “On”, “LED2”: “Off”, “LED3”: “On”}

The final test for our sensor node ...