Revisions to How to save a float variable to the EEPROM?

Improved formating

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edited Nov 12, 2023 at 19:51

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Since Since your floating point value always uses only 1 digit after the comma, why not multiply it by 10 and put it in an integer? For a value up to 15.0 (resulting in 150 int), you can use a simple byte and store it in EEPROM directly. Then

Then you can get rid of all ifif statements. To make a better formula, you can even add rounding (so adding + 0.5 before converting to an int).

Thus:

EEPROM.put(VOLT_ALARM_SET_POINT_ADDR, (byte) (value * 10.0 + 0.5);

And to retrieve the value:

EEPROM.get(VOLT_ALARM_SET_POINT_ADDR, f);
f = (float) (f / 10.0);

Since your floating point value always uses only 1 digit after the comma, why not multiply it by 10 and put it in an integer? For a value up to 15.0 (resulting in 150 int), you can use a simple byte and store it in EEPROM directly. Then you can get rid of all if statements. To make a better formula, you can even add rounding (so adding + 0.5 before converting to an int).

Thus:

EEPROM.put(VOLT_ALARM_SET_POINT_ADDR, (byte) (value * 10.0 + 0.5);

And to retrieve the value:

EEPROM.get(VOLT_ALARM_SET_POINT_ADDR, f);
f = (float) (f / 10.0);

Since your floating point value always uses only 1 digit after the comma, why not multiply it by 10 and put it in an integer? For a value up to 15.0 (resulting in 150 int), you can use a simple byte and store it in EEPROM directly.

Then you can get rid of all if statements. To make a better formula, you can even add rounding (so adding + 0.5 before converting to an int).

Thus:

EEPROM.put(VOLT_ALARM_SET_POINT_ADDR, (byte) (value * 10.0 + 0.5);

And to retrieve the value:

EEPROM.get(VOLT_ALARM_SET_POINT_ADDR, f);
f = (float) (f / 10.0);

Improved formating

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edit approved Nov 12, 2023 at 19:51

Giorgos Xou

141
8

SinceSince your floating point value always uses only 1 digit after the comma, why not multiply it by 10 and put it in an integer? For a value up to 15.0 (resulting in 150 int), you can use a simple byte and store it in EEPROM directly.

Than Then you can get rid of all if statements.

To make a better formula, you can even add rounding (so adding + 0.5 before converting to an int)(so adding + 0.5 before converting to an int).

Thus: EEPROM.put(VOLT_ALARM_SET_POINT_ADDR, (byte) (value * 10.0 + 0.5);

EEPROM.put(VOLT_ALARM_SET_POINT_ADDR, (byte) (value * 10.0 + 0.5);

And to retrieve the value: EEPROM.get(VOLT_ALARM_SET_POINT_ADDR, f); f = (float) (f / 10.0);

EEPROM.get(VOLT_ALARM_SET_POINT_ADDR, f);
f = (float) (f / 10.0);

Since your floating point value always uses only 1 digit after the comma, why not multiply it by 10 and put it in an integer? For a value up to 15.0 (resulting in 150 int), you can use a simple byte and store it in EEPROM directly.

Than you can get rid of all if statements.

To make a better formula, you can even add rounding (so adding + 0.5 before converting to an int).

Thus: EEPROM.put(VOLT_ALARM_SET_POINT_ADDR, (byte) (value * 10.0 + 0.5);

And to retrieve the value: EEPROM.get(VOLT_ALARM_SET_POINT_ADDR, f); f = (float) (f / 10.0);

Since your floating point value always uses only 1 digit after the comma, why not multiply it by 10 and put it in an integer? For a value up to 15.0 (resulting in 150 int), you can use a simple byte and store it in EEPROM directly. Then you can get rid of all if statements. To make a better formula, you can even add rounding (so adding + 0.5 before converting to an int).

Thus:

EEPROM.put(VOLT_ALARM_SET_POINT_ADDR, (byte) (value * 10.0 + 0.5);

And to retrieve the value:

EEPROM.get(VOLT_ALARM_SET_POINT_ADDR, f);
f = (float) (f / 10.0);

deleted 19 characters in body

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edited Dec 14, 2017 at 13:46

dda

1.6k
1
12
17

Since your floating point value always uses only 1 digit after the comma, why not multiply it by 10 and put it in an integer? For a value uptoup to 15.0 (resulting in 150 int), you can use a simple byte and store it in EPROMEEPROM directly.

Than you can get rid of all if statements.

To make a better formula, you can even add rounding (so adding + 0.5 before converting to an int).

Thus: EEPROM.put(VOLT_ALARM_SET_POINT_ADDR, (byte) (value * 10.0 + 0.5);

 EEPROM.put(VOLT_ALARM_SET_POINT_ADDR, (byte) (value * 10.0 + 0.5);

andAnd to retrieve the value: EEPROM.get(VOLT_ALARM_SET_POINT_ADDR, f); f = (float) (f / 10.0);

EEPROM.get(VOLT_ALARM_SET_POINT_ADDR, f);

f = (float) (f / 10.0);

Since your floating point value always uses only 1 digit after the comma, why not multiply it by 10 and put it in an integer? For a value upto 15.0 (resulting in 150 int), you can use a simple byte and store it in EPROM directly.

Than you can get rid of all if statements.

To make a better formula, you can even add rounding (so adding + 0.5 before converting to an int).

Thus

 EEPROM.put(VOLT_ALARM_SET_POINT_ADDR, (byte) (value * 10.0 + 0.5);

and to retrieve the value:

EEPROM.get(VOLT_ALARM_SET_POINT_ADDR, f);

f = (float) (f / 10.0);

Since your floating point value always uses only 1 digit after the comma, why not multiply it by 10 and put it in an integer? For a value up to 15.0 (resulting in 150 int), you can use a simple byte and store it in EEPROM directly.

Than you can get rid of all if statements.

To make a better formula, you can even add rounding (so adding + 0.5 before converting to an int).

Thus: EEPROM.put(VOLT_ALARM_SET_POINT_ADDR, (byte) (value * 10.0 + 0.5);

And to retrieve the value: EEPROM.get(VOLT_ALARM_SET_POINT_ADDR, f); f = (float) (f / 10.0);

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created Dec 14, 2017 at 10:18

Michel Keijzers

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7
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