Arduino TFT calculator with sensor screen

Hardware:

• Arduino Uno (with ATMega328P)
• TFT screen with sensor (I use one with controller r61505 ili9325)

Required libraries:

• Adafriut GFX library https://github.com/adafruit/Adafruit-GFX-Library
• Adafruit TFTLCD library https://github.com/adafruit/TFTLCD-Library
• Adafruit TouchScreen library https://github.com/adafruit/Adafruit_TouchScreen

Not completed yet:

• Screen calibration on start
• Calculation of a^b for all ranges

Completed:

• Expression parsing
• 20-digits (decimal digits) precision numbers
• Triginometric functions
• Exponential and logarithmic functions
• Constants
• Seven memory registers (A-F, M)