ESP8266 Community Forum

Posted: **Thu Jun 04, 2015 7:50 am**

I've had great luck using the ESP-01 with the Arduino IDE but nothing but problems using LUA. If you can offer any help and tell me what i'm doing wrong it would be great.

-using the NodeMCU v0.9 hardware
- using ESP8266Flasher.exe flashed 0.9.5 (nodemcu_20150213.bin)
- in ESP8266Flasher clicked the Config tab, x on the top line & selected nodemcu_20150213.bin
- in ESP8266Flasher clicked the Advanced tab took a guess and set Baudrate to 11520, Flash size to 512kByte, 40Mhz, DIO

- used the latest ESPlorer, connects ok
- tried an LED blink test but see this error

Code: Select all

NodeMCU firmware detected.
=node.heap()
22560

lighton=0
tmr.alarm(1,1000,1,function()
if lighton==0 then
lighton=1
led(512,512,512)
else
lighton=0
led(0,0,0)
end
end)
PANIC: unprotected error in call to Lua API (stdin:4: attempt to call global 'led' (a nil value))
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ÊôŒ¦¨HøNodeMcu 0.9.5 build 20150213 powered by Lua 5.1.4
lua: cannot open init.lua

Connected an i2c oled to D5 & D6
- opened u8g_graphics_test.lua
- left code as is because SDA = 5 & SCL = 6 are correct as well as address 0x3c
-Clicked Send to ESP button, then Run button but it's blank

Mike

Posted: **Sat Jun 06, 2015 5:45 am**

Hi
The function LED you are trying to use is not a built-in LUA function(see NodeMCU API) hence the error
To blink a led a on pin2( Nodemcu designation pin4) try

Code: Select all

-- Blink using timer alarm --
timerId = 0 
dly = 1000
-- use D4
ledPin = 4
-- set mode to output
gpio.mode(ledPin,gpio.OUTPUT)
ledState = 0
-- timer loop
tmr.alarm( timerId, dly, 1, function() 
  ledState = 1 - ledState;
  -- write state to D4
  gpio.write(ledPin, ledState) 
end)

Sorry can't be of help with 2nd part of your query.

Gerry

ESP8266 Community Forum

Major problems doing anything in LUA

Major problems doing anything in LUA

Re: Major problems doing anything in LUA