ML-OU-BLE – Option board

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Option board to add a BLE user interface

We often get inquiries (mainly due to tender requests or convenience reasons) about the possibility of a wireless configuration interface, although our data loggers can be configured through the cellular network wirelessly already.

Therefore its our pleasure to inform you that we have developed a tiny option board, the ML-OU-BLE, that can be mounted into an ML-417 data logger to add a wireless Bluetooth interface. Although Bluetooth Classic comes with a standardized Serial Port Profile, we have chosen, due to power consumption considerations, to use Bluetooth Low Energy instead. The big advantage of BLE is the possibility to instantly “wake-up” the data logger “over the air” while adding just 30uA of quiescent current.

Before you get started

Some useful installation notes

The theoretical maximum range with “free-line of-sight” of the ML-OU-BLE is 160m, the real range is largely dependent of the sensitivity and transmission power of the used smart phone/tablet (<70m) and interference from other devices sending radio waves.

Installation is simple, just stack the option board onto the option connector of an ML-417. No further configuration is required, except that it’s highly recommended to specify an USB/BLE password to avoid unauthorized access!!

ydocTerminal for Windows and ydocTerminal for Android can be used to configure an ML-417 with ML-OU-BLE board installed. ydocTerminal can be used to download data, upload configuration files and upgrade firmware wirelessly.

The Android app can be downloaded from the Google Play Store


  • 160m max range
  • Internal PCB antenna
  • +4dBm transmit power
  • -92dBm sensitivity
  • 30uA of quiescent current
  • Bluetooth 5.0
  • 800kbps max throughput

Discover the possibilities

Want to know more about what YDOC can do to help you with your quest for the right data logger? Do not hesitate to get in contact.