Lab 17. Control an LED and a buzzer

Owned by Thomas Watteyne

Last updated: Nov 15, 2022 by Thomas Watteyne

1 min read

Control an LED

As explained in https://github.com/dustcloud/smartmeshsdk/tree/develop/app/JsonServer, to blink the LED, you need to issue:

an HTTP PUT request
to URL: http://127.0.0.1:8080/api/v1/oap/{{mote}}/digital_out/INDICATOR_0
- here {{url}} must be replaced by the MAC address of the mote formatted as in the sm command
with body:
{ "value": 1 }
or

{ "value": 0 }

create the following Node-RED flow:
What is the configuration of the "LED on" and "LED off" nodes?

Answer 1:

What is the code you wrote in the function node?

Answer 2:

What is the configuration of the "http request" node:

verify that you can switch the LED of your mote on/off

Control a Buzzer

Connect a buzzer to the board
- buzzer pin labeled ‘+' to pin I_MOSIon your mote
- buzzer pin labeled '-' to pin GND on your mote
adapt the Node-RED flow above, replacing digital_out/INDICATOR_0 by digital_out/D4
make sure you can switch the buzzer on/off