[Question]use of readData() on lua interpreter

[kleffa]

local pin = readData([ESP201] P=4)
if pin == 1 then
print("[ESP201] P=4 V=0 ")
else
print("[ESP201] P=4 V=1 ")
end

I'm writing a couple of scripts like this one (just change state of flash on esp32cam). I know this can be just a digitalRead, but its about using readData() , this doesnt work, I missed something?
can readData used to read serial, like M27 data?

any help please to clarify it

[luc-github]

readData() read any string received by lua interpreter, from ESP3D if you send any [ESPXXX] command but also any string from serial or usb
use available() to check if any string is available then readData() to collect one string at once

here a sample script that echo any message received by lua interpreter

--[[
    Echo Serial

    This example echo serial outout to serial with echo: header 
    Put this script in the ESP3D flash file system and call it from the init script in 
    configuration.h.
    #define ESP_AUTOSTART_SCRIPT "[ESP300]/FS/detectpush.lua"

    Be sure to have the following line comment out in the configure.h:
    #define ESP_LUA_INTERPRETER_FEATURE
    ]]--

-- Setup
local availableMsg = 0
local message = ""
while (true) do
    -- check if have data
    availableMsg = available()
    -- if any message
    if (availableMsg > 0) then
        message = "echo:" .. readData()
        print(message)
    end
    -- yield to other tasks
    yield()
end

I know documentation https://esp3d.io/ESP3D/Version_3.X/documentation/lua/ is very light but no one seems used this feature until now because I got no feedback on this feature, so feel free to propose, submit better documentation, of course I will help by answering any question or give clarifications if necessary

[luc-github]

@kleffa did this answered your question ?

[kleffa]

Yes, let me try some scripts and share as example El lun, 5 de may de 2025, 21:20, Luc ***@***.***> escribió:

…

*luc-github* left a comment (luc-github/ESP3D#1092) <#1092 (comment)> @kleffa <https://github.com/kleffa> did this answered your question ? — Reply to this email directly, view it on GitHub <#1092 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AGMYMBJZ6XNI4EGGQYE56ZD25AE4LAVCNFSM6AAAAAB4NYJAO6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQNJSHEYTOMJQGY> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[kleffa]

--[[
FLASH BUTTON

This example is implemented in a ESP32-CAM.

You can set a macros, as a GCODE one, with this command
[ESP300]/FS/flash.lua

NOW YOU HAVE A FLAH BUTTON SET ON YOUR ESP32

You can also start it manually from the serial monitor by typing:
[ESP300]/FS/flash.lua

Be sure to have the following line comment out in the configure.h:
#define ESP_LUA_INTERPRETER_FEATURE
]]--

local FLASH_PIN = 4 -- GPIO for flash

pinMode(FLASH_PIN, OUTPUT)
local STATE = digitalRead(FLASH_PIN)

if STATE == HIGH then
digitalWrite(FLASH_PIN, LOW)
else
digitalWrite(FLASH_PIN, HIGH)
end

[kleffa]

--[[
Timelapse camera

This example is implemented in a ESP32-CAM.

in CURA post procesing tab, find time lapse, there is the option to set parking hotend

Put this script in the ESP3D flash file system and call it from camera trigger command
M118 P2[ESP300]/FS/autocam.lua

You can also start it manually from the serial monitor by typing:
[ESP300]/FS/autocam.lua

Be sure to have the following line comment out in the configure.h:
#define ESP_LUA_INTERPRETER_FEATURE
]]--

local FLASH_PIN = 4 -- GPIO for flash
local FLASH_DELAY = 200 -- ms for flash to stabilize
local POST_DELAY = 200 -- ms after capture before flash off

pinMode(FLASH_PIN, OUTPUT) --set FLASH_PIN
digitalWrite ( FLASH_PIN, HIGH) --turn on flash
delay ( FLASH_DELAY ) --pause
print ( "[ESP171] path=DCIM\n") --take picture
delay ( POST_DELAY ) --pause
digitalWrite ( FLASH_PIN, LOW) --turn off flash

[luc-github]

great thank you, I am happy lua is helpful for something, I did not get so many feedback

[kleffa]

I think there should be a way to convine M118 and lua to make a variable to save the timelapse pics on sd/{jobname}/ Any idea is welcome El jue, 26 de jun de 2025, 01:17, Luc ***@***.***> escribió:

…

*luc-github* left a comment (luc-github/ESP3D#1092) <#1092 (comment)> great thank you, I am happy lua is helpful for something, I did not get so many feedback — Reply to this email directly, view it on GitHub <#1092 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AGMYMBJ4YJIHLRD7A3OD42T3FN66BAVCNFSM6AAAAAB4NYJAO6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTAMBXGA4DINRXGY> . You are receiving this because you were mentioned.Message ID: ***@***.***>