This device is intended for
autonomous measuring and storing temperature and relative
air humidity data, without PC. It has enough memory
for 3 continuous years of measuring.
Click here to see ATIV device
Fizicki izgled uredaja
Device is constructed
in order to be used as portable temperature
and air humidity measuring unit. Usage of SHT11
sensor makes this device a serious candidate
for overrunning boundaries of amateurism. Important
feature for this sensor is that it needs no
configuring, and is very accurate and precise
in measuring. This device has user-friendly
menu for configuring the parameters, preview
mode for viewing non-saved measured values,
and is able to transfer saved data to PC using
Power supply: 9V (30mA-150mA, depends on
LCD back light intensity set)
Display: Smart LCD module (Hitachi HD44780
compatible) 2x16 characters
Measuring sonde: Intelligent sensor for temperature
and relative air humididy measuring,
Commands: Four push buttons: LEFT, RIGHT,
Data storing: Internal 64kb EEPROM memory
is used, which is enough for 3 years max of continuous
Measuring: Temperature: -40 °C - 99°C; Humidity:
1 - 99%
Accuracy: Temperature: ±0.5°C at 25°C Humidity:
±3.5 % RH
Measuring resolution: 0.1°C Temperature and
Real time clock: Internal, with back-up batrery
Others: Optional full memory alarm, LCD display
back light setting, preview of stored data on device
display, PC link for data transfer...
HARDWARE: rev 1.2
Device consists of PIC16F876A microcontroller, EEPROM
memory 24LC512 (64x8 kbites), Dallas DS1307 RTC, and
RS232 voltage adaptation circuit. LCD is connected
to device in 4-bit mode, so it uses minimal number
of microcontroller pins, that is, 6. Device also has
BUZZER, which is used for audible indication when
some of push buttons are pushed. It is also used for
audible warnings when memory is full, or for similar
actions. Electrical schematic for this device is shown
on picture 1.
Picture 1. Electrical schematic
the picture left to open detailed PDF file with
Picture 2. ATIV v1.2 device PCB
|Most of components are placed
on PCB. LCD is connected to connector SV2. Connector
SV3 is used for connecting SHT11 sensor. BCK_K
pin can be connected (optionally) to LCD back
light CATHODE, which enables the LCD back light
You can download zip archive with PCBs from here.
|| ATIV v1.2 device
Click on the picture to download PDF file.
FIRMWARE ver 2.0
Picture 3 shows basic display at device start up.
If you press UP button, device will start storing
measured values at preset period. Display will indicate
that sampling is in progress and will periodically
show current session number (BZ), number of stored
samples (RN) and memory left, etc, in bottom left
corner, instead of current date. If we stop storing
by pressing DOWN button and then press UP button to
start storing again, session number (BZ) will increase
by one, which eases later searching and browsing through
database in case we have multiple measuring points
(places). Record Number (RN) shows number of total
Picture 3. Main view on ATIV v1.2
|Current time is
shown in upper left corner of LCD. Current date
is shown below current time, i.e. in bottom left
corner. Measured temperature is shown on the upper
right, and bottom right corner shows relative
air humidity in percents.
SETTINGS THROUGH MENUS
You can adjust device settings easily, using LEFT
or RIGHT push buttons. By pressing LEFT or RIGHT button
we enter menus 1 to 9, that are shown in a table below.
Adjusting of desired parameter is done by using DOWN
and UP push buttons. If push buttons are inactive
longer than 8 seconds while we are in some of nine
available menu sections, LCD will display back the
Menu sections available in current firmware version
are shown below:
|Real time clock setting (Push
buttons UP, DOWN, LEFT, RIGHT)
|Selecting a period of sampling
(push buttons UP, DOWN). Total time available
for recording (depends on available memory) is
shown in upper right corner.
|If you want to delete everything
from memory, you should press UP and DOWN push
buttons simultaneously in this menu section.
|This menu section shows memory
left. 100% means that memory is completely empty.
(This menu section is informational, thus it offers
|If MEMORYFull alarm is on (ukljucen),
you will hear sound warning when memory is critically
full. (Settings are done by pressing down UP or
DOWN push buttons).
|If buzzer (bipper) is on (ukljucen),
your actions with device will have proper sound
indication. Note that buzzer must be ON for memory
alarm to work.
|Info menu. This menu section
shows info about current session number (BZ),
total memory used (MEM), number of samples recorded
(RN), Samling period (PS), etc...
|Adjustments for LCD back light
intensity. It is useful for battery saving, if
device is not powered from main supply.
||If AUTONastavak is ON (ukljucen),
in case power suddenly goes off, device will continue
work as soon as power is restored, without any
disturbance in sampling.
If you push both LEFT and RIGHT push buttons simultaneously
while on main view, you will enter sessions preview
menu, form which you can preview stored sessions on
device. Now you can select session number and then,
by pressing RIGHT push button, you can enter at start
of that session. Now, using UP and DOWN push button,
you can browse through database with time and date
shown on display. When needed entry is found, pressing
down the RIGHT push button will display numerical
and bar-graph preview of measured temperature and
air humidity for selected date/time. LCD display for
this menu is shown in table below:
|Choosing the needed session
number (BZ) (UP, DOWN push buttons)
|Browsing through date/time database
using UP, DOWN push buttons.
|RIGHT push button enters preview
of measured values for selected date/time.
Simultaneously pressing down the LEFT and RIGHT push
buttons exits this menu.
SOFTWARE: ver 1.6.02 (august 2004.)
We have created special applications for connecting
and using ATIV device on PC, ATIV Komunikacija
and ATIV Analiza. Both of these two applications
can be found in install package, which can be downloaded
from the link below. First application offers real
time tracking of measured values, displayed on PC
(Picture 4.1), reading and storing data from device
to PC, exporting data into DTS or RTF file format
(Picture 4.2), and tabular preview of stored values.
It also allows you to check device status, i.e. sampling
period that is set, memory left, number of sessions...
(Picture 4.3). Useful tool this application also offers
is device's real time clock synchronization with Windows
time on PC (Picture 4.4).
Click on desired picture to enlarge it.
ATIV analiza is application that allows graphic
preview of stored data. It features basic functions
for graphic manipulation: zoom, moving and selecting
a specific session from saved DTS file. You can also
print your graph, which completes your documentation
|This picture shows ATIV Analiza
application, which allows graphic preview of DTS
files, that are exported from ATIV Komunikacija
Click on picture to enlarge it.
Installation archive for ATIV software (WinXP, WinME,
Win98) can be downloaded from here.
Firmware is not free, so, if you are interested in
ordering HEX file, you can contact me at: firstname.lastname@example.org
If there are some unclearnesses about this project,
feel free to contact me at: email@example.com