Hw input read
Jump to navigation
Jump to search
Description
state = hw_input_read(hw_input_id)
hw_input_read is used to read the state of a hardware input.
Return value
| Argument | Type | Description |
|---|---|---|
| state | Boolean | The pin state. True is pin high, false is pin low. |
Arguments
| # | Argument | Type | Description |
|---|---|---|---|
| 1 | hw_input_id | String | The is the reference to the input. You can get this reference from the hw_input_add function. |
Example
-- Callback function which is called when the input state changes
function input_change(state)
print("new state = " .. tostring(state) )
end
-- Bind to Raspberry Pi 2, Header P1, Pin 40
inp_id = hw_input_add("RPI_V2_P1_40", input_change)
-- Read the actual state
-- state true : input is high
-- state false : input is low
state = hw_input_read(inp_id)