Ananthan's Blog

Ever wanted to print text in colours? You can do it with ANSI escape characters. You can use ANSI codes in any programming language as long as the terminal supports it. echo -e "\e[31mRed" Red echo -e "\e[32mGreen" Green Replace the number to get different colors. You can make text bold, italics, underline etc. Following is a short table describing several codes. 39     Default 30     Black      31      Red    32      Green    33      Yellow     34      Blue     35      Magenta 36      Cyan    37      Light gray    97      White      For a complete reference, link . (The page has a complete list of ANSI codes)

Follow the instruction to enable the ADC and read outputs from the file. echo  BB-ADC > /sys/devices/bone_capemgr.9/slots (*There may be slight variation for directories. Figure this out if not working.) Verify whether ADC is loaded by cat /sys/devices/bone_capemgr.9/slots Read ADC value by cat /sys/bus/iio/devices/iio\:device0/in_voltage0_raw Here AIN0 (PIN39 on P9) is connected to a potentiometer. Do not exceed the voltage above 1.8V . This will damage the BBB. Its a 12 bit ADC. So maximum value will be 4096. To calculate value in voltage, (1.8/4096) *ADC_Value I wrote a bash script to do this work. For this script to work install bc on BeagleBoneBlack. bc is a small program to do mathematical calculation from terminal. apt-get install bc Save the above bash script to a file (adc_bash) and set permission to execute by chmod +x adc_bash To run it every 0.5 second, watch -n 0.5 ./adc_bash Once finished with the ADC you can unexport it. But it