go-lepton
Streams images taken on a FLIR Lepton connected to a Raspberry Pi SPI port to over via WebSockets via embedded HTTP server. It sends the raw data which is then processed as javascript.
Prerequisite Setup
Setup is fairly involved so it's in its dedicated SETUP.md page.
Installing
Building go-lepton on the Raspberry Pi v1 takes ~10s which is slow but still much faster than cross-compiling and transferring the file in.
go get github.com/maruel/go-lepton/cmd/lepton
Then run lepton.
Verification
Running the following command should have the corresponding output:
$ lepton -query
Status.CameraStatus: SystemReady
Status.CommandCount: 0
Serial: 0x12345
Uptime: 48m56.275s
Temperature: 30.75°C
Temperature housing: 26.34°C
Telemetry: Enabled
TelemetryLocation: Header
FCCMode.FFCShutterMode: FFCShutterModeExternal
FCCMode.ShutterTempLockoutState: ShutterTempLockoutStateInactive
FCCMode.VideoFreezeDuringFFC: Enabled
FCCMode.FFCDesired: Enabled
FCCMode.ElapsedTimeSinceLastFFC: 48m56.285s
FCCMode.DesiredFFCPeriod: 5m0s
FCCMode.ExplicitCommandToOpen: Disabled
FCCMode.DesiredFFCTempDelta: 3.00°K
FCCMode.ImminentDelay: 52
Performance
Reading the SPI port takes ~50% the CPU of a Raspberry Pi v1 running Raspbian. There's a rumor about DMA based transfer but for now that's the fastest that can be achieved.
Power
The FLIR Lepton takes ~150mW. The breakout board doesn't expose the necessary pins to put it in sleep mode. Sadly this means that if the Lepton goes into a bad mode, rebooting the Pi won't help.
Debug build
To debug cmd/lepton/static/root.html so that each HTTP request returns the file from disk, use:
go install -tags debug ./cmd/lepton
