Writing and reading float using Arduino EEPROM
This post is just for a personal reminder after reading discussions from elsewhere about storing and reading float values to/from EEPROM with Arduino.
Writing negative float to EEPROM can be tricky, since EEPROM only recognises up to 8-bit values (see Tronixstuff explanation), therefore it requires an additional algorithm to make it able to store negative and float. the scheme is to use four bits of the ATmega328's EEPROM to store numerical parts of a float value. The function involved is union.
You may grab the code here
Scenario
Writing negative float to EEPROM can be tricky, since EEPROM only recognises up to 8-bit values (see Tronixstuff explanation), therefore it requires an additional algorithm to make it able to store negative and float. the scheme is to use four bits of the ATmega328's EEPROM to store numerical parts of a float value. The function involved is union.
//union value
typedef union{
float flt;
byte array[4];
} FloatConverter;
The code
You may grab the code here
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