ESP8266 Community Forum

- Fri Apr 03, 2015 3:16 pm #13403 Hi,

Id made a mistake in my Lua code, but i cant find it.
The code does nothing ..., thats the problem.

In general its a code to fetch data from a easy selfmade soil moisture sensor.
Id tryed to port my Arduino Sketch to Nodemcu´s Lua.

How id built the sensor is shown in the code, if you are interested in building one.
Please help me,

Thanks in advance

Code: Select allfunction setup()
   gpio.mode(voltageFlipPin1, gpio.OUTPUT);
   gpio.mode(voltageFlipPin1, gpio.OUTPUT);
   -- ADC pin is already a input
end

function setSensorPolarity(flip)
   -- Flip pins for the moisture sensor
   if(flip == true)then
      gpio.write(voltageFlipPin1, gpio.HIGH);
      gpio.write(voltageFlipPin2, gpio.LOW);
   else if(flip == false) then
      gpio.write(voltageFlipPin1, gpio.LOW);
      gpio.write(voltageFlipPin2, gpio.HIGH);
   end
end

function loop()
   -- repeat loop infinite
   repeat
      setSensorPolarity(true);
      delay(flipTimer);
      val1 = adc.read(0)
      delay(flipTimer); 
      setSensorPolarity(false);
      delay(flipTimer);
      -- invert the reading
      val2 = 1023 - analogRead(sensorPin);
      --
      reportLevels(val1,val2);
   until ( state == true )
end

function reportLevels(val1,val2)
  --make a average and report the average to console
  avg = (val1 + val2) / 2;
 
  msg = "avg: ";
  tempvar = msg + avg;
  print(tempvar);
end

-- gamecompilers soil moisture code
-- Circuit   :
-- Voltage devider :  620Kohm -> ADC -> 300Kohm
-- 6.8nF foil capacitor parallel to the 300Kohm resistor

wifi.setmode(wifi.STATION);
wifi.sta.config("APtest","Gurki");
print(wifi.sta.getip());

voltageFlipPin1 = 7;
voltageFlipPin2 = 5;
-- ADC pin -> adc.read(0)

gpio.mode(voltageFlipPin1, gpio.OUTPUT)
gpio.mode(voltageFlipPin1, gpio.OUTPUT)

-- state will never be true
state = false;

-- the time between flips, current circuit needs a min of 4ms
-- to let the capacitor become loaded
flipTimer = 1000;
setup();
loop();



end

- Sat Apr 04, 2015 6:18 am #13441 Moin,

IMHO you are trying far to much in one step.
You can't copy arduino code which is written in C to lua and expect it to work with only
few tweaks.
Do your translation in small steps that you understand and can test.
To get familiar with lua syntax get a lua interpreter 5.1 for your platform and
try snippets there.

When I put your code on my nodemcu it gives immediate syntax errors.
Thats the same as on arduino. If you can't compile it won't run.

Just my EUR 0,02.

Carsten

Get your modules here:

https://www.banggood.com/custlink/KvGGhGF4wG