local/bin/scan_loop.sh


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#!/bin/sh

# The scan loop is useful when Automatic Document Feeder (ADF) can't be used

scan_device_uri="hpaio:/net/OfficeJet_Pro_6970?ip=192.168.18.21"
# ^This HP printer is remarkable.  It's been working fine since 2017. I refill
# the cardridge with UV ink very easily (I've never purchased ink cardridges
# other than the ones that came with the printer).  As of 2023, only the Cyan
# and Black cardridges/inkjets work but Black&White print is all I need.  
# And the Linux support and CLI interface is amazing.


# Automatic Document Feeder
adf() {
    hp-scan --mode=color --resolution=300 --size=a4 --adf #--duplex
}


# Scans until terminated with ^C.  Saves .png files on CWD.  
flatbed_loop() {
    echo "Warning: scan loop will run until terminated with Ctrl-C"
    i=0
    while true; do
        # device show with $ hp-info
        hp-scan --mode=color --size=a4 --device=$scan_device_uri
        echo "page " $((i + 1)) " done,  you have 4 seconds to load next page"
        sleep 4
        i=`expr $i + 1`
    done
    # convert *.png output.pdf
}