DS18B20

info

Currently unused, soon to be discontinued.

api.ds18b20GetTemp(pwrpin, datapin)

Overview

Returns temperature in milli degrees of Celsius (m°C) from DS18B20.

info

In case of using multiple DS18B20 connected to one data pin, it's possible to address one DS18B20 with ID.

warning

Disabled by default, FW & HW changes required.

Arguments

• pwrpin (integer) - Power pin number
• datapin (integer) - Data pin number
• address (array, optional) - Array of numbers used as address (8 bytes)

info

When no array is specified, get temperature from first 1W device.

Returns

• (integer) - number in millidegrees Celsius

Examples

-- Search all devices on the 1-Wire bus
found=api.ds18b20Search(1,2)
-- `found` contains a table of addresses of found devices
-- or `nil` when no device was found

-- Print count of devices found
if (found)
then
    print("Found " .. #found .. " devices")
    -- Loop over all addresses
    for i = 1,#found,1
    do
        temp=api.ds18b20GetTemp(1,2,found[i])
        temp = temp/1000
        print("Teplomer #" .. i .. " " .. temp .. "C")
    end
else
    print("No devices found!")
end

--Without addressing (one sensor=one data pin)

res1 = api.ds18b20GetTemp(1, 2) -- get temperature from sensor connected to data pin 2
print("Temperature: "..tostring(res).." mDeg.C")

api.ds18b20Search(pwrpin, datapin)

Overview

Searches for DS18B20 devices on the 1-Wire bus.

Arguments

api.ds18b20Search(pwrpin, datapin, num)

• pwrpin (integer) - Power pin number
• datapin (integer) - Data pin number
• numdev (integer, optional) - Number of found devices to stop the scan after

Return

• (integer) - nil or array of addresses found on specified bus

Example

--Find addresses of 3 sensors
api.ds18b20Search(1, 2, 3)