Data logger is here!

After months of planning and designing, I’m excited to announce that the all-in-one SDI-12 data logger is here! I got the board printed and assembled one for testing last week. Been testing its features for several days now. I’m putting it in a nice IP66-rated enclosure for more tests and development.

This device is meant to be a one-stop-shop for data logging needs with minimal setup and learning time while my SDI-12 USB adapters are meant to add SDI-12 and other sensors to your existing datalogging PC or Raspberry Pi (assuming you’re willing to learn some Linux and the Pi).

For now, here are a couple of photos of just the board:

Board in my hand

Board with a 4-channel hi-res analog input extension board

Here is a list of features:

• Open-source full-feature Python data logging script
• SDI-12 translator with 4 SDI-12 sensor connectors (more can be added)
• 4 analog auto-scaling single-ended analog inputs up to 20uV precision
• 2 analog auto-scaling differential analog inputs up to 20uV precision (alt. to 4-chn single-end)
• Socket for optional 2G/3G/4G LTE/ZigBee/Digimesh RF modules
• Resistance sensing with optional precision 1K or 10K pull-up resistors (0.1% 20ppm/degC)
• Extension port allows up to 12 more precision analog and resistance sensors
• Micro-SD card slot (up to 32GB of non-volatile program and data storage)
• Data file download via FTP (Wi-Fi)
• Hi-precision temperature-compensated Real Time Clock for time keeping (2-4 ppm)
• Power cycle SDI-12 sensors to reset problematic SDI-12 sensors
• Wi-Fi connection to upload data to servers (requires a Wi-Fi hotspot/router)
• 4 analog single-ended analog inputs up to 5mV precision where less precision is acceptable
• 4 digital on/off inputs (alt. to 4 5mV analog chn)
• 4 digital pulse counters for rain gauges, anemometers etc. (alt. to 4 5vV analog chn)
• Device temperature monitoring
• Starter MicroSD card with logging script included
• Xbee sleep to conserve power
• Interactive sensor and logger setup interface
• Optional water-proof enclosure
• Optional wired adapter for more software development

I will add more details later.