Scientific RPN Calculator (with ATTINY85)

03092018, 07:51 AM
Post: #25




RE: Scientific RPN Calculator (with ATTINY85)
Hi Pauli!
Thanks for all of your ideas. I tried to implement statistics and linear regression  which needed approx. 1000 bytes  to much  so I refused this for now. Then I implemented converting polar/rectangular coordinates and h/hms which "costs" me all of my spare 800 bytes. I know the gamma function, but neither I needed in before nor saw it on basic HPcalculators. But the gamma function seems to be worth implementing and doing this with Nemes' formula should "cost" approx. 200 bytes. I did not know the memmove function but I will give it a try (it is on my todolist). But (overnight) I fell in love with your idea to save user defined constants to the EEPROM. I gave it a rough try and implemented "saving 3 characters and a float number" to a "EEPROM slot" and "menu driven selecting due to these 3 characters and loading the float number". This demands approx. 700 bytes only (and there is still room for improvement). Still a lot to do this weekend ... Regards deetee 

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