read_sensor

read_sensor.sh

#!/usr/bin/env ruby

MAX_RETRY = 3
PATH = "/sys/bus/iio/devices/"
TEMP_SENSOR = PATH + "iio\:device#{ARGV[0].to_i}/in_temp_input"
HUMIDITY_SENSOR = PATH + "iio\:device#{ARGV[0].to_i}/in_humidityrelative_input"

def save_read(sensor)
  run = 1
  while run < MAX_RETRY
    x = `cat #{sensor} 2>/dev/null`
    if x == ''
      run += 1
      @retries += 1
    else
      return (x.to_i / 1000).to_f
    end
   end
end

@retries = 0
temperatur = save_read TEMP_SENSOR
humidity   = save_read HUMIDITY_SENSOR

if temperatur
   puts "#{temperatur&.round(2)}C - #{humidity&.round(2)}% - retries: #{@retries}"
else
   puts "ERROR - retries: #{@retries}"
end