Reading temperature and sensor ID
Is easy to have only one device on your 1wire bus - no identification problem and only two function used. It is also a good solution to read the device's ID - required when you use multiple devices on your 1wire bus. So, this is what we do now - reading temperature and the ID.
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The code is based mainly on two important libraries: 1_wire.jal and ds18b20.jal - see header inside for authors.
-- Read sensor temperature DS18B20 in Celsius degree.
-- It is about an unique device on 1wire bus
-- Copyright Vasile Guta Ciucur
-- New BSD License
alias d1w_bus_in is D11
alias d1w_bus_out is D11_direction
-- LCD IO definition
alias lcd_rs is D9 -- LCD command/data select.
alias lcd_en is D8 -- LCD data trigger
alias lcd_rs_direction is D9_direction
alias lcd_en_direction is D8_direction
alias lcd_d4 is D3
alias lcd_d5 is D4
alias lcd_d6 is D5
alias lcd_d7 is D6
alias lcd_d4_direction is D3_direction
alias lcd_d5_direction is D4_direction
alias lcd_d6_direction is D5_direction
alias lcd_d7_direction is D6_direction
const byte LCD_ROWS = 2 -- 2 lines
const byte LCD_CHARS = 16 -- 16 chars per line
lcd_rs_direction = output
lcd_en_direction = output
lcd_d4_direction = output
lcd_d5_direction = output
lcd_d6_direction = output
lcd_d7_direction = output
-- LED IO definition - Uncomment the lines if you want tp use leds for debug
--alias led is D13
--alias led_direction is D13_direction
--alias led2 is D2
--alias led2_direction is D2_direction
--led_direction = output
--led2_direction = output
--led = low
--led2 = low
include lcd_hd44780_4 -- LCD library with 4 data lines
include print -- formatted output library
const byte str1 = "Temp.= "
lcd_init() -- initialize LCD
var bit sign
var byte units, decimals
var byte i
forever loop -- loop forever
s_temp_18B20_CRC(units, decimals, sign)
if sign == 1 then
lcd = "-"
lcd = "."
lcd = "C"
-- read the device's ID and print it
for 8 using i loop