I have tried to port the existing Radiometric Lepton 2.5 drivers/software to two battery-powerable platforms (the Raspberry Pi Zero W and the ESP32 Arduino implementation), but it seems to require more brainpower than a sleep deprived new father can muster. And so I present to you, the informal Battery-powered Radiometric Lepton Contest!
The FLIR Lepton is a thermal camera made accessible to the maker community by the wonderful folks at GroupGets, who (in addition to making the Lepton available in small quantities), also produce a breakout board for the lepton, as well as a board called the Purethermal 2 that exposes the Lepton as a USB device.
While there's been a great deal of work in creating open source drivers for the Lepton (such as pylepton and GetThermal for the Raspberry Pi, and this Arduino Lepton driver), there's currently a limitation in capabilities. To the best of my knowledge, there are not working, easily-replicable demonstrations (including code) to use the Lepton in radiometric mode (that's where each pixel has an associated temperature value, not just a relative value) for platforms that can be battery powered and have a low barrier to entry-- specifically here, the Raspberry Pi Zero W, and the ESP32 Arduino implementation.
The purpose of this contest is to help improve this situation by asking folks to publish open source drivers and instructions to drive the Lepton 2.5 in radiometric mode for these platforms, with battery power in mind.
Two $125 prizes (in the form of Sparkfun credit) are available: one for the Raspberry Pi Zero W platform, and one for the ESP32 Arduino platform.
Create a hackaday.io project with all the relevant materials, and add a link to it in the comments to this contest!
- An open source driver and example code for running the FLIR Lepton 2.5 in radiometric mode, on either the Raspberry Pi Zero W, or the ESP32 (under the Arduino IDE).
- The drivers and software must be published using an open, permissive license (e.g. BSD)
- Hardware: The drivers must interface with the commodity, easily-available breakout board. For the Raspberry Pi Zero W, you may alternately choose to use the PureThermal 2 (which may simplify keeping the camera in sync). The drivers must interface with the radiometric Lepton 2.5 . Also being able to interface to the brand new Lepton 3.5 in addition to the 2.5 is a bonus, but not required.
- Software (Pi Zero W): You must provide the source of a console program that runs on Raspbian that outputs space-delimited temperature values, one per pixel, in plain text (e.g. 24.5 20.2 18.8, ...), with successive frames delimited by a carriage return (\n). The program should be able to be piped such that the values can be saved to a text file, or called/read in by another program.
- Software (ESP32 Arduino): You must provide the source of a program that reads frames from the Lepton, and stores them in an 80x60 array. The values can either be floats (e.g. 24.5) or 8-bit uint8_t's (for space) that are easily converted to raw temperature values with the supplied code. The software should work on the standard ESP-WROOM-32 modules (with a minimum of pin requirements).
- Battery power: Either through simple hardware or software, you must demonstrate being able to put the FLIR Lepton into low power (or zero power) mode, and wake it (and repeated cycles of this), so that both systems can run on batteries, and only power the FLIR when required. Use a current meter to demonstrate that this is working and provide measures of the power draw. Clarification: the low-power mode, whether implemented...