--' -- 18b20 one wire example for NODEMCU -- NODEMCU TEAM -- LICENCE: http://opensource.org/licenses/MIT -- Vowstar --' pin = 9 ow.setup(pin) count = 0 repeat count = count + 1 addr = ow.reset_search(pin) addr = ow.search(pin) tmr.wdclr() until((addr ~= nil) or (count > 100)) if (addr == nil) then print("No more addresses.") else print(addr:byte(1,8)) crc = ow.crc8(string.sub(addr,1,7)) if (crc == addr:byte(8)) then if ((addr:byte(1) == 0x10) or (addr:byte(1) == 0x28)) then print("Device is a DS18S20 family device.") repeat ow.reset(pin) ow.select(pin, addr) ow.write(pin, 0x44, 1) tmr.delay(1000000) present = ow.reset(pin) ow.select(pin, addr) ow.write(pin,0xBE,1) print("P="..present) data = nil data = string.char(ow.read(pin)) for i = 1, 8 do data = data .. string.char(ow.read(pin)) end print(data:byte(1,9)) crc = ow.crc8(string.sub(data,1,8)) print("CRC="..crc) if (crc == data:byte(9)) then t = (data:byte(1) + data:byte(2) * 256) -- handle negative temperatures if (t > 0x7fff) then t = t - 0x10000 end if (addr:byte(1) == 0x28) then t = t * 625 -- DS18B20, 4 fractional bits else t = t * 5000 -- DS18S20, 1 fractional bit end t1 = t / 10000 t2 = t % 10000 print("Temperature= "..t1.."."..t2.." Centigrade") end tmr.wdclr() until false else print("Device family is not recognized.") end else print("CRC is not valid!") end end