ESP8266 Community Forum

Posted: **Fri Dec 23, 2016 9:54 am**

Hi everbody. I'm new and i'm from Poland.

I also wan't to sorry for my english

I want to start messure humidity, temp and air prssure by esp8266 + BMP280. I'm trying to use these materials:

https://github.com/vsky279/BME280

My pins are :
BMP280 - ESP8266
scl - d5
sda - d7
vcc - vcc
gnd - gnd

I'm useing default firmwere from esp8266flasher. When im trying to write bme280.lua LuaLoade gives me that sort of data:

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> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > stdin:1: unexpected symbol near '.'
> > > > > > > > > > > > > > > > > > > > > > stdin:1: ')' expected near ']'
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > 
12053 bytes uploaded to bme280.lua

When i start bme280_do.lua i got:

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dofile(bme280_do.lua)  23 grudzień 2016  15:43:59

dofile("bme280_do.lua")
bme280_do.lua:5: wrong arg range
stack traceback:
   [C]: in function 'init'
   bme280_do.lua:5: in main chunk
   [C]: in function 'dofile'
   stdin:1: in main chunk
>

bme280_do.lua source:

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d=require("bme280")

alt=320 -- altitude of the measurement place

d:init()

-- calculate coefficient to get air pressure converted to sea level (QNH)
d:altCal(alt)
print("h="..string.format("%9X", d.hH)..string.format("%9X", d.hL).." *2^"..d.hE)

-- read sensor
adc_T = d:readAdc(1)
adc_P = d:readAdc(2)
adc_H = d:readAdc(3)
if not adc_T or not adc_P then return end
print(string.format("adc_T=%X\tadc_P=%X\tadc_H=%X", adc_T, adc_P, adc_H))

-- calculate temperature
T, t_fine = d:compensateT(adc_T)
print((string.gsub(string.format("T=%d.%2d", T/100, T%100), " ", "0")), "t_fine="..t_fine)

-- calculate aire pressure
P = d:compensateP(adc_P, t_fine)
print((string.gsub(string.format("QFE=%d.%3d", P/1000, P%1000), " ", "0")))

-- convert measure air pressure to sea level pressure
QNH = d:qfe2qnh(P, alt)
print((string.gsub(string.format("QNH=%d.%3d", QNH/1000, QNH%1000), " ", "0")))

H = d:compensateH(adc_H, t_fine)
print((string.gsub(string.format("humidity=%d.%3d%%", H/1000, H%1000), " ", "0")))

-- altimeter function - calculate altitude based on current sea level pressure (QNH) and measure pressure
adc_T = d:readAdc(1)
adc_P = d:readAdc(2)
T, t_fine = d:compensateT(adc_T)
P = d:compensateP(adc_P, t_fine)
curAlt=d:altitude(P, QNH)
print(string.gsub(string.format("altitude=%d.%2d", curAlt/100, curAlt%100), " ", "0"), "adc_T="..string.format("%X", adc_T), "adc_P="..string.format("%X", adc_P))

d=nil;package.loaded["bme280"]=nil;

BME280 librar code:

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-- ***************************************************************************
-- BMP280 module for ESP8266 with nodeMCU
--
-- Written by Lukas Voborsky, @voborsky
--
-- MIT license, http://opensource.org/licenses/MIT
-- ***************************************************************************

return({
scl=5,
sda=7,
addr=0x76,
alt = 0,
hH = 0,
hL = 1,
hE = 0,
dig_T = {},
dig_P = {},
dig_H = {},

readReg = function(self, reg, size, signed, LE, valw)
   size = size or 2
   LE = LE and true or false
   
   i2c.start(0) --beginTransmission((uint8_t)_i2caddr);
   i2c.address(0, self.addr, i2c.TRANSMITTER)
   i2c.write(0, reg);
   if valw then i2c.write(0, valw) end
   i2c.stop(0);

   if not size or size == 0 then return nil end
   
   i2c.start(0) --beginTransmission((uint8_t)_i2caddr);
   i2c.address(0, self.addr, i2c.RECEIVER)
   local data=i2c.read(0, size) --requestFrom((uint8_t)_i2caddr, (byte)2);
   i2c.stop(0) --endTransmission();

   local i
   local value = 0
   for i=LE and size or 1, LE and 1 or size, LE and -1 or 1 do
      value = bit.bor(bit.lshift(value, 8), data:byte(i))
   end

   if signed and (value > 0x7fff) then
      value = value - 0x10000
   end

   return value
end,

init = function(self, pscl, psda)
   local BMP280_REGISTER_CONTROL = 0xF4
   local BMP280_REGISTER_CONTROL_HUM = 0xF2
   --local BMP280_REGISTER_CONFIG = 0xF5
   local BMP280_REGISTER_DIG_T = 0x88
   local BMP280_REGISTER_DIG_P = 0x8E
   local BMP280_REGISTER_DIG_H1 = 0xA1
   local BMP280_REGISTER_DIG_H2 = 0xE1
   local BMP280_REGISTER_CHIPID = 0xD0
   --local BMP280_REGISTER_VERSION = 0xD1
   --local BMP280_REGISTER_SOFTRESET = 0xE0
   --local BMP280_REGISTER_CAL26 = 0xE1

   tmr.wdclr()
   if pscl then self.scl=pscl end
   if psda then self.sda=psda end

   print("Checking sda/scl to GPIO - IO index "..self.sda.."/"..self.scl)
   i2c.setup(0, self.sda, self.scl, i2c.SLOW)

   local tp
   for i=0,127 do
      i2c.start(0)
      local c=i2c.address(0, i, i2c.TRANSMITTER)
      i2c.stop(0)
      if c then
         self.addr=i
         local chipid = self:readReg(BMP280_REGISTER_CHIPID, 1)
         if chipid == 0x60 then tp="BME280" end
         if chipid == 0x58 then tp="BMP280" end
         if tp then
            print("Device "..tp.." found at address 0x"..string.format("%02X", i))
            break
         end
      end
   end
   if not tp then return end

   self.dig_T[1] = self:readReg(BMP280_REGISTER_DIG_T, 2, false, true) -- not signed, LE
   for i=2, 3 do self.dig_T[i] = self:readReg(BMP280_REGISTER_DIG_T + (i-1)*2, 2, true, true) end --signed, LE

   self.dig_P[1] = self:readReg(BMP280_REGISTER_DIG_P, 2, false, true) -- not signed, LE
   for i=2, 9 do self.dig_P[i] = self:readReg(BMP280_REGISTER_DIG_P + (i-1)*2, 2, true, true) end -- signed, LE
   
   if tp=="BME280" then
      self.dig_H[1] = self:readReg(BMP280_REGISTER_DIG_H1, 1) -- char
      self.dig_H[2] = self:readReg(BMP280_REGISTER_DIG_H2, 2, true, true) -- signed, LE
      self.dig_H[3] = self:readReg(BMP280_REGISTER_DIG_H2 + 2, 1) -- char
      local dH = self:readReg(BMP280_REGISTER_DIG_H2 + 3, 2, true, false) -- signed, BE
      self.dig_H[4] = bit.arshift(bit.band(dH, 0xFF00), 4) + bit.band(dH, 0xF)
      self.dig_H[5] =  bit.arshift(self:readReg(BMP280_REGISTER_DIG_H2 + 5, 2, true, true), 4) -- signed, LE
      self.dig_H[6] = self:readReg(BMP280_REGISTER_DIG_H2 + 7, 1) -- signed, char
      if bit.isset(self.dig_H[6], 7) then self.dig_H[6]=self.dig_H[6] - 0x100 end -- signed
   end
   
   --print(self.dig_T[1], self.dig_T[2], self.dig_T[3], self.dig_P[1], self.dig_P[2], self.dig_P[3], self.dig_P[4], self.dig_P[5], self.dig_P[6], self.dig_P[7], self.dig_P[8], self.dig_P[9], self.dig_H[1], self.dig_H[2], self.dig_H[3], self.dig_H[4], self.dig_H[5], self.dig_H[6])

   self:readReg(BMP280_REGISTER_CONTROL_HUM, 0, nil, nil, 0x05);
   self:readReg(BMP280_REGISTER_CONTROL, 0, nil, nil, 0x3F);

   return self.addr
end,

readAdc = function(self, meter)
   local BMP280_REGISTER_DATA = {0xFA, 0xF7, 0xFD} -- temperature, pressure, humidity
   local raw = self:readReg(BMP280_REGISTER_DATA[meter], meter == 3 and 2 or 3)
   if meter~= 3 then raw = bit.rshift(raw, 4) end
   if raw==0x80000 then return nil else return raw end
end,

compensateT = function(self, adc_T)
   --var1  = ((((adc_T>>3) – ((BME280_S32_t)self.dig_T1<<1))) * ((BME280_S32_t)self.dig_T2)) >> 11;
   local var1  = bit.arshift((bit.arshift(adc_T,3) - bit.lshift(self.dig_T[1],1)) * self.dig_T[2], 11)
   --var2  = (((((adc_T>>4) – ((BME280_S32_t)self.dig_T1)) * ((adc_T>>4) – ((BME280_S32_t)self.dig_T1))) >> 12) *  
   --     ((BME280_S32_t)self.dig_T3)) >> 14; 
   local var2  = bit.arshift(
      bit.arshift(
         (bit.arshift(adc_T,4) - self.dig_T[1]) * (bit.arshift(adc_T,4) - self.dig_T[1])
      , 12) * self.dig_T[3]
   , 14) 
   local t_fine = var1 + var2
   local T = bit.arshift(t_fine * 5 + 128, 8)
   return T, t_fine
end,

compensateP = function(self, adc_P, t_fine)
   -- // Returns pressure in Pa as unsigned 32 bit integer in Q24.8 format (24 integer bits and 8 fractional bits). 
   -- // Output value of “24674867” represents 24674867/256 = 96386.2 Pa = 963.862 hPa 
   local a=require("math64")

   -- var1 = ((BME280_S64_t)t_fine) – 128000;
   local var1L = t_fine - 128000
   local var1H = bit.isset(var1L, 31) and -1 or 0

   -- var2 = var1 * var1 * (BME280_S64_t)self.dig_P[6];
   local var2H, var2L
   var2H, var2L = a:mult64(var1H, var1L, var1H, var1L)
   var2H, var2L = a:mult64(var2H, var2L, bit.isset(self.dig_P[6],31) and -1 or 0, self.dig_P[6])

   -- var2 = var2 + ((var1*(BME280_S64_t)self.dig_P[5])<<17);
   do
      local var1P5H, var1P5L
      var1P5H, var1P5L = a:mult64(var1H, var1L, bit.isset(self.dig_P[5],31) and -1 or 0, self.dig_P[5])
      var1P5H, var1P5L = a:shl(var1P5H, var1P5L, 17)
      var2H, var2L = a:add64(var2H, var2L, var1P5H, var1P5L)
   end

   -- var2 = var2 + (((BME280_S64_t)self.dig_P[4])<<35);
   var2H = var2H + bit.lshift(self.dig_P[4], 3) --bit.lshift(self.dig_P[4], 35)

   -- var1 = ((var1 * var1 * (BME280_S64_t)self.dig_P[3])>>8) + ((var1 * (BME280_S64_t)self.dig_P[2])<<12);
   do
      local var1_2H, var1_2L 
      var1_2H, var1_2L = a:mult64(var1H, var1L, bit.isset(self.dig_P[2],31) and -1 or 0, self.dig_P[2])
      var1_2H, var1_2L = a:shl(var1_2H, var1_2L, 12)
      
      local var1_1H, var1_1L
      var1_1H, var1_1L = a:mult64(var1H, var1L, var1H, var1L)
      var1_1H, var1_1L = a:mult64(var1_1H, var1_1L, bit.isset(self.dig_P[3],31) and -1 or 0, self.dig_P[3])
      var1_1H, var1_1L = a:shr(var1_1H, var1_1L, 8)
      var1H, var1L = a:add64(var1_1H, var1_1L, var1_2H, var1_2L)
   end

   -- var1 = (((((BME280_S64_t)1)<<47)+var1))*((BME280_S64_t)self.dig_P[1])>>33;
   var1H, var1L = a:add64(var1H, var1L, 0x8000, 0)
   var1H, var1L = a:mult64(var1H, var1L, bit.isset(self.dig_P[1],31) and -1 or 0, self.dig_P[1])
   var1H, var1L = a:shr(var1H, var1L, 33)
   
   local pL
   if var1H ~= 0 or var1L~=0 then
      pL = 1048576 - adc_P
      local pH = 0
      --p = (((p<<31)-var2)*3125)/var1;
      pH = bit.arshift(pL, 1) -- lshift 31 - 32
      pL = bit.lshift(pL, 31)
      pH, pL = a:add64(pH, pL, bit.bnot(var2H), bit.bnot(var2L) + 1)
      pH, pL = a:mult64(pH, pL, 0, 3125)
      pH, pL = a:div64(pH, pL, var1H, var1L)

      --var1 = (((BME280_S64_t)self.dig_P[9]) * (p>>13) * (p>>13)) >> 25;
      do
         local p13H, p13L
         p13H, p13L = a:shr(pH, pL, 13)
         p13H, p13L = a:mult64(p13H, p13L, p13H, p13L)
         p13H, p13L = a:mult64(p13H, p13L, bit.isset(self.dig_P[9],31) and -1 or 0, self.dig_P[9])
         var1H, var1L = a:shr(p13H, p13L, 25)
      end

      --var2 = (((BME280_S64_t)self.dig_P[8]) * p) >> 19; 
      var2H, var2L = a:mult64(pH, pL, bit.isset(self.dig_P[8],31) and -1 or 0, self.dig_P[8])
      var2H, var2L = a:shr(var2H, var2L, 19)

      --p = ((p + var1 + var2) >> 8) + (((BME280_S64_t)self.dig_P[7])<<4); 
      pH, pL = a:add64(pH, pL, var1H, var1L)
      pH, pL = a:add64(pH, pL, var2H, var2L)
      pH, pL = a:shr(pH, pL, 8)
      local p7L = bit.lshift(self.dig_P[7], 4)
      local p7H = bit.arshift(self.dig_P[7], 32-4)
      pH, pL = a:add64(pH, pL, p7H, p7L)

      pL=bit.rshift(pL*10, 8) --
   end
   return pL
end,

compensateH = function(self, adc_H, t_fine)
   local a=require("math64")
   
   -- v_x1_u32r = (t_fine – ((BME280_S32_t)76800)); 
   local v_x1L = t_fine - 76800;
   local v_x1H = bit.isset(v_x1L, 31) and -1 or 0
   
   -- v_x1_u32r = (((((adc_H << 14) – (((BME280_S32_t)dig_H4) << 20) – (((BME280_S32_t)dig_H5) * v_x1_u32r)) + 
      -- ((BME280_S32_t)16384)) >> 15) * (((((((v_x1_u32r * ((BME280_S32_t)dig_H6)) >> 10) * (((v_x1_u32r * 
      -- ((BME280_S32_t)dig_H3)) >> 11) + ((BME280_S32_t)32768))) >> 10) + ((BME280_S32_t)2097152)) * 
      -- ((BME280_S32_t)dig_H2) + 8192) >> 14)); 
   -- (((adc_H << 14) – (((BME280_S32_t)dig_H4) << 20) – (((BME280_S32_t)dig_H5) * v_x1_u32r)) + ((BME280_S32_t)16384)) >> 15)
   local aH, aL
   do
      local a2H, a2L
      aH, aL = a:shl(0, adc_H, 14)
      a2H, a2L = a:shl(bit.isset(self.dig_H[4], 31) and 0 or -1, -self.dig_H[4], 20)
      aH, aL = a:add64(aH, aL, a2H, a2L)
      a2H, a2L = a:mult64(bit.isset(self.dig_H[5], 31) and -1 or 0, self.dig_H[5], bit.bnot(v_x1H), -v_x1L) -- -v_x1 so we can use directly in subtraction
      aH, aL = a:add64(aH, aL, a2H, a2L)
   end
   aH, aL = a:add64(aH, aL, 0, 16384)
   aH, aL = a:shr(aH, aL, 15)
   
   --(((((((v_x1_u32r * ((BME280_S32_t)dig_H6)) >> 10) * 
      -- (((v_x1_u32r * 
      -- ((BME280_S32_t)dig_H3)) >> 11) + ((BME280_S32_t)32768))) >> 10) + ((BME280_S32_t)2097152)) * 
      -- ((BME280_S32_t)dig_H2) + 8192) >> 14)
   local bH, bL
   do
      local b2H, b2L
      bH, bL = a:mult64(v_x1H, v_x1L, bit.isset(self.dig_H[6], 31) and -1 or 0, self.dig_H[6])
      bH, bL = a:shr(bH, bL, 10)
      
      b2H, b2L = a:mult64(v_x1H, v_x1L, bit.isset(self.dig_H[3], 31) and -1 or 0, self.dig_H[3])
      b2H, b2L = a:shr(b2H, b2L, 11)
      b2H, b2L = a:add64(b2H, b2L, 0, 32768)
      bH, bL = a:mult64(bH, bL, b2H, b2L)
   end
   bH, bL = a:shr(bH, bL, 10)
   bH, bL = a:add64(bH, bL, 0, 2097152)
   bH, bL = a:mult64(bH, bL, bit.isset(self.dig_H[2], 31) and -1 or 0, self.dig_H[2])
   bH, bL = a:add64(bH, bL, 0, 8192)
   bH, bL = a:shr(bH, bL, 14)
   
   v_x1H, v_x1L = a:mult64(aH, aL, bH, bL)

   -- v_x1_u32r = (v_x1_u32r – (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) * ((BME280_S32_t)dig_H1)) >> 4));
   do
      local v_x12H, v_x12L
      v_x12H, v_x12L = a:shr(v_x1H, v_x1L, 15)
      v_x12H, v_x12L = a:mult64(v_x12H, v_x12L, v_x12H, v_x12L)
      v_x12H, v_x12L = a:shr(v_x12H, v_x12L, 7)
      v_x12H, v_x12L = a:mult64(v_x12H, v_x12L, bit.isset(self.dig_H[1], 31) and 0 or -1, -self.dig_H[1])
      v_x12H, v_x12L = a:shr(v_x12H, v_x12L, 4)
      v_x1H, v_x1L = a:add64(v_x1H, v_x1L, v_x12H, v_x12L)
   end
   
   -- v_x1_u32r = (v_x1_u32r < 0 ? 0 : v_x1_u32r);
   if bit.isset(v_x1H, 31) then v_x1L = 0 end
   -- v_x1_u32r = (v_x1_u32r > 419430400 ? 419430400 : v_x1_u32r);   
   if bit.rshift(v_x1L, 1) > 0x19000000 then v_x1L = 0x19000000 end
   -- v_x1H has further undefined value and can't be used
   
   -- return (BME280_U32_t)(v_x1_u32r>>12); 
   v_x1L = bit.rshift(v_x1L, 12)
   return bit.arshift(v_x1L * 1000, 10)
 end,

qfe2qnh = function(self, p, pAlt)
   if pAlt~=self.alt then
      self:altCal(pAlt)
   end

   local a=require("math64")
   local pH, pE, pL
   pH, pL, pE = a:mult64(0, p, self.hH, self.hL, 0, self.hE)
   pH, pL, pE = a:shr(pH, pL, -pE, pE)

   return pL
end,

altCal = function(self, pAlt)
   local a=require("math64")
   local kH=0xB -- 0.0000225577
   local kL=0xD3A4AB91
   local kE=-51
   local cH = 0x15060 -- 5.25588
   local cL=0x5681ECD5
   local cE=-46

   local rH, rL, rE
   print("Calculating altitude correction coefficient for alt "..pAlt.." m")
   rH, rL, rE = a:mult64(0, pAlt, kH, kL, 0, kE)

   --ln(1-(1-r))=ln(r)
   rH, rL, rE = a:ln(rH, rL, rE) 
   rH, rL, rE = a:mult64(rH, rL, cH, cL, rE, cE)
   rH, rL, rE = a:exp(rH, rL, rE) 

   self.hH, self.hL, self.hE = rH, rL, rE
   self.alt = pAlt

   return rH, rL, rE
end,

altitude = function(self, P, P0)
   local a=require("math64")
   local cH=0x30B51 -- 1/5.25588
   local cL=0x50E22871
   local cE=-52
   local kH=0x10E92D -- 1/0.0000225577 * 100
   local kL=0x044C38E6
   local kE=-30

   local rH, rL, rE
   rH, rL, rE = a:div64(P0-P, 0, 0, P0, -32, 0)

   --ln(1-(1-r))=ln(r)
   rH, rL, rE = a:ln(rH, rL, rE) 
   rH, rL = bit.bnot(rH), bit.bnot(rL) + 1
   rH, rL, rE = a:mult64(rH, rL, cH, cL, rE, cE)
   rH, rL, rE = a:exp(rH, rL, rE) 
   rH, rL, rE = a:add64(0, 1, bit.bnot(rH), bit.bnot(rL) + 1, 0, rE) 
   rH, rL, rE = a:mult64(rH, rL, kH, kL, rE, kE)

   rH, rL = a:shr(rH, rL, -rE)
   return rL
end
})

Can somebody help me?

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ESP8266 + BMP280

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