Onsite Weather Logger/Propeller



Buy Options

The OWL3pro is usually customized for each customer's specific application. Please contact us for more information about how the OWL data logger will work for you.


The OWL3pro is a data logger, capable of various and sundry tasks. It is based around the Parallax P8X32 Propeller, a 32 bit, 8 core microcontroller capable of running multiple routines in parallel. sensor, communication, and data processing.

The OWL3pro can run at multiple clock speeds ranging from 80 MHz for high speed down to 20 kHz for micro-power. It is capable of serial programming and debugging and has 64 kbyte eeprom program and data memory.

For I/O, there are two four-channel, 16-bit analog to digital converters suitable for low level measurements. Signals can be either single ended or differential and can range from 0.256V to 3.3V full scale.

The OWL3pro runs off and can provide 3.3V power. There is also a switching power supply for external sensors and for powering an SD card.

General purpose input/output pins provide an interface to the microcontroller. The OWL3pro can be supplied with screw down terminals to easily access the i/o.


  • Parallax "Propeller" microcontroller
    • 32 bit, 8 core
    • capable of mulitple simultaneous threads for sensor and communications interface and data processing
    • multiple clock speeds, 80Mhz for high speed down to 20kHz
    • 20µA for long battery life
    • 64kbyte eeprom program and data memory.
    • serial programming and debugging
    • library programming objects, see obex.parallax.com
  • 8 channel, 16 bit analog to digital converters
    • suitable for thermocouples or other low level measurements.
    • single ended or differential down to 0.256V up to 3.3V full scale.
    • on-board reference temperature sensor.
    • 8 channels single ended, 4 differential, or combination of the two.
  • 5ppm temperature compensated real time clock
    • battery backed scratchpad for memory and alarms
  • 3.3V power
    • also switched power for external sensors and SD card
    • 1st level I/0 protection
  • General purpose input/output interface from microcontroller
  • I/O protected by 220 ohm resistors from miswiring and short circuit.
  • 2RS232 system interface
    • just like a standard Propellor, addressed as P30 and P31
    • also used as programming port, just like any other Propellor.
    • Built-in attention capacitor.
  • Real time clock with embedded crystal
    • ISL12020M keeps accurate time from seconds to years
    • ± 5ppm accuracy
    • lithium cell backup, included, keeps clock running for 10 years even when the main power is disconnected, automatic power switching.
    • On board temperature measurement can be used for software error correction.
  • Main OWL3pro accessories
    • standard SD card via stacking circuit board.
    • on board socket for XBee wireless.
    • breakout terminals and headers.
    • i2c LCD screen and button module.
    • enclosure and mouting options.
    • Li-ion battery and charger
    • apllication programming


OWL3pro cut sheet


2229 5th Street, Berkeley, CA 94710 • (510) 848-5725 •