** Note ** use this feature in Mandeye controller : JanuszBedkowski/mandeye_controller#33

UcCode

The firmware can be run on Wemos D1 Mini board with WS2012 RGB leds. The LED signal is connected to D4 pin of the Wemos Board.

Compilation

To compile and upload code to Wemos D1 Mini board you need PlatformIO. PlatformIO is toolset for embedded systems.

To install PlatformIO simply:

pip install -U platformio
cd UcCode
pio run --target upload --upload-port /dev/ttyUSB0

Commands to send to Wemos

Fimware expects following data at its USB-serial port at baudrate 115200:

{"brightness":1,"active":4278190335,"inactive":4294901760,"ledState":0}

Where:

• brightness is number 0-255
• active is a color for 1-bits
• inactive is a color for 0-bits

**Note ** colors are unsigned integer where every 2 byte word represents colors (red, green, blue, alpha). Color can be obtained as:

uint32_t ConvertColorToUc(const std::array<uint8_t,3>& color){
    return uint32_t(0xff000000) | (color[0] << 16) | (color[1] << 8) | color[2];
}

MandeyeTimeStampToLed App

This executable should be deployed to Mandeye device. It listens to ZMQ status that is published everysecond by Mandeye Controller, interpolates it and sends command to Wemos every one-tenth of the seconds, updating displayed timestamp.

This code can be compiled:

mkdir -p TimestampToLed/build
cd TimestampToLed/build
cmake .. && make

It can be run as process, to do that simply create another file in

Service installation: Create a file /usr/lib/systemd/system/mandeye_leds.service with content. Note that you need to adjust your user's name:

[Unit]
Description=Mandeye_LedTimestamp
After=multi-user.target

[Service]
User=pi
StandardOutput=null
StandardError=null
ExecStartPre=/bin/sleep 20
ExecStart=/home/pi/MandeyeLedTimestamp/TimestampToLed/build/TimestampToLed 
Restart=always

[Install]
WantedBy=multi-user.target

Next reload daemons, enable and start the service`

sudo systemctl daemon-reload
sudo systemctl enable mandeye_leds.service
sudo systemctl start mandeye_leds.service

You can check status of the service with:

sudo systemctl status mandeye_leds.service