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Introducing tCam-POE

A project log for Lepton 3.5 Thermal Imaging Camera

Documenting my experiments with the FLIR Lepton 3.5 thermal imaging camera.

dan-julioDan Julio 07/28/2022 at 22:010 Comments

I've been working on a new tCam model that helps deal with the limitations of WiFi in some situations, for example monitoring temperature inside metal cabinets or other industrial environments.  The tCam-POE design is based on the tCam-Mini design but also includes support for wired ethernet through the inclusion of an ethernet PHY chip and magnetics.  In fact it and tCam-Mini will run the same firmware starting with the upcoming version 3.0 release.  tCam-POE can connect using either 10/100 ethernet or WiFi (switch selectable at power up) and it can be powered via a USB-C 5V power source or, with the additional of a commonly available IEEE 802.3af DC-DC converter module, via power-over-ethernet.

Shown here are my two prototypes sporting Winchen and Silvertel POE DC-DC converters.

tCam-POE has the same command set as tCam-Mini with one exception.  The set_wifi command doesn't need to include WiFi-specific arguments such as SSID and Password and tCam-POE cannot be configured to serve DHCP addresses over ethernet (it still can act as an AP when running with the WiFi interface).  It 's ethernet interface either gets a DHCP served address from an external router or it is set with a static IPv4 address.  It also doesn't have the hardware interface that tCam-Mini Rev 4 PCB has.

Porting the code to support it was pretty easy as Espressif has built-in support for an ethernet interface and after initialization the same network stack can be used for either WiFi or ethernet.

Small changes are being made to the other apps so they can identify the new model number sent by tCam-POE.

All code will be put up in the next couple of weeks.

The plan is for Group Gets to build and stock these units.  Hopefully in the next 2-3 months - pending parts availability (I'm getting better about specifying parts with multiple sources...)

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