June 2020
Page 15 of 21
Timer
When in timer mode, Altum will capture according to the timer period, which is every two
seconds by default. If the timer period is set to capture faster than the storage device can write
the captures, inconsistent capture intervals may result. The capture rate is heavily dependent
on the write speed of the attached storage device, and is prone to unreliable physical capture
spacing if the aircraft does not travel at a constant ground speed. See the USB Storage and
Ethernet and Capture Rate headings in this guide for more details.
External Triggering
For more control, you can enable external trigger mode to talk to Altum by PWM or edge
triggering. See the Host Interface Connector section of this document for detailed pin
information.
External Trigger
The sensor can be set to trigger by the rising-edge of a pulse, the falling-edge of a pulse, or a
PWM signal (such as is typically used with standard servos). When using a PWM signal as the
trigger, the sensor detects a transition from a “long” PWM to a “short” PWM (or vice-versa).
When using PWM, rising-edge, or falling-edge, ensure that the input signal’s ground is
connected to the isolated ground pin 8 on the Altum.
HTTP API (Ethernet and Wi-Fi)
The HTTP API is the most powerful way to interface with the Altum. You can use this API using
either the Ethernet connector or the camera’s Wi-Fi access point.
The API is accessed via HTTP connection to port 80 at the sensor IP address. Most data is
exchanged in the JSON format.
The actual value of the IP address depends on the configuration. When accessing the sensor
via its Wi-Fi access point, the sensor IP address will be 192.168.10.254. When the sensor is
connected to an Ethernet network, the sensor IP address will be 192.168.1.83 by default.
The sensor can be commanded to take a capture by either a GET or POST request to the
/capture URL.
For more information, please see https://www.micasense.com/api
For examples, please see these articles:
● Integration examples for MicaSense sensors
© 2020 MicaSense, Inc
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