Update DS18b20 examples (#1851)
- Remove old non-async examples from `lua-examples`. - Rename `ds18b20.EN.md` to `README.md` - Change remaining `toBase64` calls to the more standard `toHex` call. - Fix some spelling and markdown formatting issues in README file. Addresses issue #1841
This commit is contained in:
Jonathan Karras
devsaurus
parent
d53ac8db90
commit
784fefebe7
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@ -1,76 +0,0 @@
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--'
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-- ds18b20 one wire example for NODEMCU (Integer firmware only)
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-- NODEMCU TEAM
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-- LICENCE: http://opensource.org/licenses/MIT
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-- Vowstar <vowstar@nodemcu.com>
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--'
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pin = 9
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ow.setup(pin)
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count = 0
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repeat
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count = count + 1
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addr = ow.reset_search(pin)
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addr = ow.search(pin)
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tmr.wdclr()
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until((addr ~= nil) or (count > 100))
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if (addr == nil) then
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print("No more addresses.")
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else
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print(addr:byte(1,8))
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crc = ow.crc8(string.sub(addr,1,7))
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if (crc == addr:byte(8)) then
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if ((addr:byte(1) == 0x10) or (addr:byte(1) == 0x28)) then
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print("Device is a DS18S20 family device.")
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repeat
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ow.reset(pin)
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ow.select(pin, addr)
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ow.write(pin, 0x44, 1)
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tmr.delay(1000000)
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present = ow.reset(pin)
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ow.select(pin, addr)
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ow.write(pin,0xBE,1)
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print("P="..present)
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data = nil
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data = string.char(ow.read(pin))
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for i = 1, 8 do
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data = data .. string.char(ow.read(pin))
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end
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print(data:byte(1,9))
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crc = ow.crc8(string.sub(data,1,8))
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print("CRC="..crc)
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if (crc == data:byte(9)) then
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t = (data:byte(1) + data:byte(2) * 256)
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-- handle negative temperatures
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if (t > 0x7fff) then
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t = t - 0x10000
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end
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if (addr:byte(1) == 0x28) then
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t = t * 625 -- DS18B20, 4 fractional bits
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else
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t = t * 5000 -- DS18S20, 1 fractional bit
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end
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local sign = ""
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if (t < 0) then
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sign = "-"
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t = -1 * t
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end
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-- Separate integral and decimal portions, for integer firmware only
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local t1 = string.format("%d", t / 10000)
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local t2 = string.format("%04u", t % 10000)
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local temp = sign .. t1 .. "." .. t2
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print("Temperature= " .. temp .. " Celsius")
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end
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tmr.wdclr()
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until false
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else
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print("Device family is not recognized.")
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end
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else
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print("CRC is not valid!")
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end
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end
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@ -1,73 +0,0 @@
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------------------------------------------------------------------------------
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-- DS18B20 query module
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--
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-- LICENCE: http://opensource.org/licenses/MIT
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-- Vladimir Dronnikov <dronnikov@gmail.com>
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--
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-- Example:
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-- dofile("ds18b20.lua").read(4, function(r) for k, v in pairs(r) do print(k, v) end end)
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------------------------------------------------------------------------------
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local M
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do
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local bit = bit
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local format_addr = function(a)
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return ("%02x-%02x%02x%02x%02x%02x%02x"):format(
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a:byte(1),
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a:byte(7), a:byte(6), a:byte(5),
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a:byte(4), a:byte(3), a:byte(2)
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)
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end
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local read = function(pin, cb, delay)
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local ow = require("ow")
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-- get list of relevant devices
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local d = { }
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ow.setup(pin)
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ow.reset_search(pin)
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while true do
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tmr.wdclr()
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local a = ow.search(pin)
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if not a then break end
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if ow.crc8(a) == 0 and
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(a:byte(1) == 0x10 or a:byte(1) == 0x28)
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then
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d[#d + 1] = a
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end
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end
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-- conversion command for all
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ow.reset(pin)
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ow.skip(pin)
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ow.write(pin, 0x44, 1)
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-- wait a bit
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tmr.alarm(0, delay or 100, 0, function()
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-- iterate over devices
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local r = { }
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for i = 1, #d do
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tmr.wdclr()
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-- read rom command
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ow.reset(pin)
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ow.select(pin, d[i])
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ow.write(pin, 0xBE, 1)
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-- read data
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local x = ow.read_bytes(pin, 9)
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if ow.crc8(x) == 0 then
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local t = (x:byte(1) + x:byte(2) * 256)
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-- negatives?
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if bit.isset(t, 15) then t = 1 - bit.bxor(t, 0xffff) end
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-- NB: temperature in Celsius * 10^4
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t = t * 625
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-- NB: due 850000 means bad pullup. ignore
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if t ~= 850000 then
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r[format_addr(d[i])] = t
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end
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d[i] = nil
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end
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end
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cb(r)
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end)
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end
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-- expose
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M = {
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read = read,
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}
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end
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return M
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@ -1,5 +1,5 @@
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#DS18B20 Module
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##Require
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# DS18B20 Module
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## Require
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```lua
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ds18b20 = require("ds18b20")
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```
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@ -10,31 +10,31 @@ package.loaded["ds18b20"]=nil
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```
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<a id="ds18b20_setup"></a>
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##readTemp()
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Scans the bus for DS18B20 sensors, starts a readout (conversion) for all sensors and calls a callback function when all temperatures are available. Powered sensors are read at once first. Parasit-powered sensors are read one by one. The first parasit-powered sensor is read together with all powered sensors.
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## readTemp()
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Scans the bus for DS18B20 sensors, starts a readout (conversion) for all sensors and calls a callback function when all temperatures are available. Powered sensors are read at once first. Parasite-powered sensors are read one by one. The first parasite-powered sensor is read together with all powered sensors.
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The module requires `ow` module.
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The also module uses `encoder` module for printing debug information with more readable representation of sensor address (`encoder.toBase64()`).
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The also module uses `encoder` module for printing debug information with more readable representation of sensor address (`encoder.toHex()`).
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####Syntax
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#### Syntax
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`readTemp(callback, pin)`
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####Parameters
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- `callback` function that receives all results when all conversions finish. The callback funciton has one parameter - an array addressed by sensor addresses and a value of the temperature (string for integer version).
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#### Parameters
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- `callback` function that receives all results when all conversions finish. The callback function has one parameter - an array addressed by sensor addresses and a value of the temperature (string for integer version).
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- `pin` pin of the one-wire bus. If nil, GPIO0 (3) is used.
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####Returns
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#### Returns
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nil
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####Example
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#### Example
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```lua
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t = require("ds18b20")
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pin = 3 -- gpio0 = 3, gpio2 = 4
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function readout(temp)
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for addr, temp in pairs(temp) do
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print(string.format("Sensor %s: %s 'C", encoder.toBase64(addr), temp))
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print(string.format("Sensor %s: %s 'C", encoder.toHex(addr), temp))
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end
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-- Module can be released when it is no longer needed
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@ -48,7 +48,7 @@ if t.sens then
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print("Total number of DS18B20 sensors: "..table.getn(t.sens))
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for i, s in ipairs(t.sens) do
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-- print(string.format(" sensor #%d address: %s%s", i, s.addr, s.parasite == 1 and " (parasite)" or ""))
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print(string.format(" sensor #%d address: %s%s", i, encoder.toBase64(s.addr), s.parasite == 1 and " (parasite)" or "")) -- readable address with base64 encoding is preferred when encoder module is available
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print(string.format(" sensor #%d address: %s%s", i, encoder.toHex(s.addr), s.parasite == 1 and " (parasite)" or "")) -- readable address with Hex encoding is preferred when encoder module is available
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end
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end
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```
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@ -8,13 +8,13 @@ function readout(temp)
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local resp = "HTTP/1.1 200 OK\nContent-Type: text/html\nRefresh: 5\n\n" ..
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"<!DOCTYPE HTML>" ..
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"<html><body>" ..
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"<b>ESP8266</b></br>"
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"<b>ESP8266</b></br>"
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for addr, temp in pairs(temp) do
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-- resp = resp .. string.format("Sensor %s: %s ℃</br>", addr, temp)
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resp = resp .. string.format("Sensor %s: %s ℃</br>", encoder.toBase64(addr), temp) -- readable address with base64 encoding is preferred when encoder module is available
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resp = resp .. string.format("Sensor %s: %s ℃</br>", encoder.toHex(addr), temp) -- readable address with base64 encoding is preferred when encoder module is available
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end
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resp = resp ..
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"Node ChipID: " .. node.chipid() .. "<br>" ..
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"Node MAC: " .. wifi.sta.getmac() .. "<br>" ..
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