I have a Foscam FI9831P V2 in my living room. It switches on it’s IR-leds if it detects that the brightness of the room is too low to get good quality images.
I wanted to use this brightness value to control my accent lights etc. but their API/CGI cannot provide this information.
Correction: Actually the CGI does support it, http:///cgi-bin/CGIProxy.fcgi?usr=user&pwd=pass&cmd=getDevState, as pointed out by @chairstacker below.
So my thought was, can I take a still image and check if it’s in color or grayscale? The answer is Yes! Since I use TinyCam Pro for NVR, I take the still image from there… but it can of course be taken directly from the camera.
bin/dayornight.sh:
#!/bin/bash
TMPFILE=$(mktemp /tmp/dayornight.XXXXXX)
OUTFILE=/home/homeassistant/.homeassistant/whitelist_dir/dayornight.txt
# Fetch still image from Foscam-camera, via TinyCam
curl --basic -u user:pass -o $TMPFILE http://<IP OF TINYCAM:8040/axis-cgi/jpg/image.cgi?cameraId=<CAMERA ID>
if ! file "$TMPFILE" | grep JPEG; then
echo "File is not an image"
exit 1
fi
# Get a value. If value is < 0.1, it's a greyscale image. If it's >0.1, it's color
# https://stackoverflow.com/questions/23922654/detect-if-image-is-grayscale-or-color-using-imagick
VALUE_RAW=`convert $TMPFILE -colorspace HSL -channel g -separate +channel -format "%[fx:mean]" info:`
# Multiply by 10 + round off to be able to compare
# <1 = grayscale
# >1 && < 10 = color
VALUE=`echo "$VALUE_RAW * 10" | bc | awk '{print int($1+0.5)}'`
echo $VALUE > $OUTFILE
rm $TMPFILE
Crontab:
# Run dayornight.sh every 5 minutes
*/5 * * * * /home/homeassistant/bin/dayornight.sh >/dev/null 2>&1
configuration.yaml:
homeassistant:
# To be able to read files from disk
whitelist_external_dirs:
- /home/homeassistant/.homeassistant/whitelist_dir
sensor:
- platform: file
name: Brightness
file_path: /home/homeassistant/.homeassistant/whitelist_dir/dayornight.txt
As I wrote in the OP, I was sure that this information was not provided by the CGI. I have read that PDF file before and have experimented with the CGI a bit.
