Self made
data-logger
V2.5 (second edition) (gehe zur
deutschen Version)
An instuction for the construction of the older data-logger is to
be found here:
d_logger.htm
(also information for additional sensors available, unfortunately only
in german)
(last modification: 04.06.2005)
The new data-logger software is not yet completely finished.
But the hardware design is frozen and will probably not be
changed
anymore.
The printed circuit board is a bit smaller than the old one (36x22mm).
But unfortunately the new one can measure analog input signals only
with 10 bit resolution.
The sensor for barometric altitude and its amplifier are contained
on
the printed circuit board now.
Since the dissolution of altitude (10 bit) is too rough for the climb
rate, an additional circuit is on the board.
An amplifier for current measurements as well as an amplifier for
measuring
bridges are likewise contained on the board.
Thus only an additional shunt or a measuring bridge (e.g. a
differential
pressure sensor with pitot tube) needs to be attached.
The measured data can be stored in a EEPROM and / or transferred by
telemetry or by cable to a PalmPilot or PC.
The baud rate for the telemetry mode is selectable. 1200 and 9600 baud
are available.
The data rate for the transfere of the the stored data to the Palm
/ PC was increased to 38400 baud.
Version V2.5 are different to version V2.4 in case of the
circuit
for current measurement. Therefore BEC-systems can used now.
Version V2.9 supports also GPS-receiver with ANTARIS chipset
and simultaneously using of
internal temperature sensor of MS5534A and external DS1820 sensor. This
version can use 24C256, 24C512 or 24C1024 EEPROMs and has an internal
'bootloader' implemented.
With V2.9g you can configure
the datalogger for the 'Multilogging mode' (more than one loggs
possible after switch off).
V2.9h supports DS18S20
temperature sensors, 2-wire connection for the temp sensor (connect
pin1
and 3 of the sensor) and better start condition for GPS using.
following the old data:
Additional sensors:
Following a modified circuit for the current
measurement:
Digital pressure sensor:
Instead of the analog pressure sensor MPX4100 you can now connect a
combined pressure and temperature sensor MS5534A.
The connectors which are normaly used by the additional LTC2400 and
the connector for the analog variometer signal are used then.
The benefit of this sensor is the larger range (300...1100mbar) and
the calibration.
Attention: To use this sensor
the reference voltage must adjust to 3.3 ... 3.6V (R1, R2).
Besides the sensor must be registered to the logger (use the
"Loggerleserprogram" for this reason).
Manchester-2 to RS232
Decoder
This decoder is necessary if the bi-phase-code
(Manchester-2-code) is used by the telemetry. This feature is
configurable by the "Logerleserprogram".
The decoder is installed after the telemetry receiver and transform the
Man-2-code to the normally used RS232-code for the PC or Palm.
The adjustable resistor adjust the threshold for the used data.The led
show if the treshold is exeeded.
If RSSI is not available on the receiver then pin6 of the PIC12F629
must be connected to pin1.
The software is in the development phase and
can measure only
the following signals at the moment.
- 5 analog channels (4x 10 bit, 1x 8 bit)
- 1 period duration input, for number of
revolutions,
speed etc. (16bit, pin 21)
- 1 frequency input for speed etc. (16bit,
pin 6)
- 1 temperature input (8Bit, DS1820, Pin11)
- 3 RC channel inputs (additional 1 RC
channel
for
switching the logger ON and OFF, RC0)
- In place of the RC channels, the digital
outputs
of a ADXL202 (acceleration-sensor) can be used.
- GPS (longitude, latitude and altitude),
38400
baud NMEA interface used
- Simple vario tone output (pin 13)
- Additionally it's possible to use a 24
bit
analog
digital converter (LTC-2400) for more accuracy.
- Telemetry data can be transmitted by using Manchester-2-code or
RS232 format.
- Version V2.9 has an internal 'Bootloader' for easier
software updates via the RS232-connection (without PIC-burner). (For
upgrades connect pin 5 and pin1 of the EEPROM with a 220ohm-resistor
and switch the logger on).
- Automatically recognize of the used EEPROM 24C256 / 24C512
/ 24C1024.
- With version V2.9g you can use the datalogger for more than one
flight also after switch of the power of the datalogger.
The current software can be downloaded here:
- Software version V2.9 for the PIC-controller (inclusive
bootloader): log29_pic.zip
(for 32k /64k and 128kByte EEPROM)
Remark: Install this
version always first. Following versions will be loadable then via the
internal bootloader of this version.
- Betaversion V2.9h for the PIC-controller: log29h_alti_pic.zip
(for 32k /64k and 128kByte EEPROM)
- Software for the PalmPilot: logger_2g_Palm.zip
( for V2.9g and higher versions, limited to
32k data)
- Brief description for the old Palm program (english): log_e.pdf
- Telemertry software for the PC: telePC02.zip
(Coefficients can be changed by 'SkyPlot')
- An Exel example sheet: log2_exel.zip
- The Windows software for the transmission of the dates to a
computer as
well as the program for showing of the GPS-data please download by http://www.sprut.de
:
(LoggerLeser: http://www.sprut.de/electronic/soft/logger.htm
)
(SkyPlot: http://www.sprut.de/electronic/soft/skyplot.htm
)
Perhaps you can buy a finished
datalogger in a lightly changed layout by Walter Windhagauer.
Questions, suggestions on the layout on: Jonas
Romblad
Questions, suggestions on the design & software on: Dietrich
Meissner
Datalogger-Forum: http://groups.yahoo.com/group/RC_datalogger/
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