Description
hw_switch_id = hw_switch_add(name, nr_pins, callback) (from AM 3.5)
hw_switch_id = hw_switch_add(hw_id_0, hw_id_1, hw_pos_n,callback)
switch_add is used to add a hardware switch. Every position on the switch should use one hardware input.
Return value
| Argument |
Type |
Description
|
| hw_switch_id |
ID |
This value can be used for further reference.
|
Arguments
| # |
Argument |
Type |
Description
|
| 1 |
hw_id_0 |
String |
The is the reference to first switch input. You can choose to bind to an existing Hardware ID (Hardware_id_list).
|
| 2 |
hw_id_1 |
String |
The is the reference to the second switch input. You can choose to bind to an existing Hardware ID (Hardware_id_list).
|
| n |
hw_id_n |
String |
The hw_id for all other positions you might need. This is limitless
|
| n+1 |
callback |
Function |
This function will be called when the switch changed position.
|
Example
-- This function is called every time the switch has a new position
function switch_callback(position)
print("The switch got changed to position " .. position)
end
-- Bind to Raspberry Pi 2, Header P1, Pin 38 and 40
hw_switch_add("RPI_V2_P1_38", "RPI_V2_P1_40", switch_callback)
Schematic example
