Blink Recipe
This recipe uses 1 digital output to blink a LED and a timer to create actions.
The timer element loops permanently and produces a action every second alternating with value 0 and 1.
The action is directed to the digitalout element.
The current on the GPIO pins flowing into GND can be much higher than the current given by a HIGH level. This is one reason why the standard wiring for LEDs is to light the LED on GPIO16(D0) when the output level is low.
Therefore the invert mode is enabled and the initial (logical input) value is set to 0.
Configuration
{
"timer": {
"blink": {
"description": "Timer for testing",
"type": "LOOP",
"waittime": "0s",
"pulsetime": "1s",
"cycletime": "2s",
"onvalue": "digitalout/led?value=$v"
}
},
"digitalout": {
"led": {
"pin": "D4",
"invert": "true",
"value": "0",
"description": "Builtin LED is on Port D0 = GPIO16"
}
}
}