Building a short Beaglebone deamon programme

It will help if you're familiar with beaglebone or raspberry pi interface. I have a deadline so this has to be a little accelerated. Regarding the script, there should be 5 integral values namely: 'I(DS)' range:(6.03uA, 7.23uA), 'V(NP)' range:(0.46v, 0.38v), 'V(DS)' constant:(1.03v), 'CC' range:(233uM-1101uM), 'BG' range:(4.99mmol, 7.77mmol) All the other three values are dependent on 'I(DS)'value. In other words, 'I(DS)' is proportional to ['V(NP)' inversely in this case], 'CC' and 'BG' where 'I(DS)' is the main variable and other 3 values are 'I(DS)' dependent variable. Changing of 'I(DS)': At the start of programme, 'I(DS)' will start at a random value in it's given range. I(DS) is to be randomly added or subtracted by a random value between 0 to 0.05 in a random time delay between 15 to 30 seconds. Also 'I(DS) should not exceed or fall short of it's given range. All the following real-time values have to be displayed through a 20*4 char liquid crystal display. Programme can be written in any language. Thank you for your time.