Memory_Consumption_Infos

Device Buffer, usage per device

	Fast IO	Normal IO
analog device	29 byte	29 byte
button	6 byte	4 byte
digital input MUX	9 byte	6 byte
encoder	35 byte	31 byte
input shifter	17 byte	11 byte
lcdDisplay	18 byte	18 byte
output	2 byte	2 byte
Output Shifter	15 byte	9 byte
Led Segment	28 byte	22 byte
Servos	23 byte	23 byte
Stepper	14 byte	14 byte

Memory consumption

Mega:

NormalIO

RAM:   [======    ]  55.3% (used 4528 bytes from 8192 bytes)
Flash: [=         ]  10.8% (used 27534 bytes from 253952 bytes)

-> 226.418 bytes left

FastIO

RAM:   [======    ]  55.4% (used 4540 bytes from 8192 bytes)
Flash: [=         ]  11.2% (used 28354 bytes from 253952 bytes)

-> 225.598 bytes left

Device Buffer 1496 byte

Name Buffer with 1000 byte can be freed up

Bytes which are requested from the device buffer

Device	FastIO	NormalIO
40 Outputs:	80 byte	80 byte
68 Buttons:	408 byte	272 byte
4 LEDSegment:	112 byte	88 byte
20 Encoder:	700 byte	620 byte
10 Stepper:	140 byte	140 byte
10 Servos:	230 byte	230 byte
2 LCD:	36 byte	36 byte
16 AnalogIn:	464 byte	464 byte
4 OutputShifter:	60 byte	36 byte
4 InputShifter:	68 byte	44 byte
4 MUX:	36 byte	24 byte

Micro:

NormalIO

RAM:   [========  ]  76.6% (used 1960 bytes from 2560 bytes)
Flash: [==========]  97.4% (used 27916 bytes from 28672 bytes)

-> 756 bytes left

FastIO

RAM:   [========  ]  77.0% (used 1972 bytes from 2560 bytes)
Flash: [==========]  100.2% (used 28718 bytes from 28672 bytes)

-> exceeds Flash!!!

Device Buffer 440 byte

Name Buffer with 350 byte can be freed up

Bytes which are requested from the device buffer

Device	FastIO	NormalIO
18 Outputs:	36 byte	36 byte
18 Buttons:	108 byte	72 byte
1 LEDSegment:	28 byte	22 byte
9 Encoder:	315 byte	279 byte
3 Stepper:	42 byte	32 byte
3 Servos:	69 byte	69 byte
2 LCD:	36 byte	36 byte
5 AnalogIn:	145 byte	145 byte
2 OutputShifter:	30 byte	18 byte
2 InputShifter:	34 byte	22 byte
3 MUX:	27 byte	18 byte

Uno/Nano:

NormalIO

RAM:   [========= ]  86.6% (used 1773 bytes from 2048 bytes)
Flash: [========  ]  83.3% (used 25598 bytes from 30720 bytes)

-> 5.122 bytes left

FastIO

RAM:   [========= ]  87.2% (used 1785 bytes from 2048 bytes)
Flash: [========= ]  86.0% (used 26418 bytes from 30720 bytes)

-> 4.302 bytes left

Device Buffer 286 byte

Name Buffer with 220 byte can be freed up

Bytes which are requested from the device buffer

Device	FastIO	NormalIO
18 Outputs:	36 byte	36 byte
18 Buttons:	108 byte	72 byte
1 LEDSegment:	22 byte	22 byte
9 Encoder:	!!!315 byte	279 byte
2 Stepper:	28 byte	28 byte
2 Servos:	46 byte	46 byte
2 LCD:	36 byte	36 byte
6 AnalogIn:	174 byte	174 byte
2 OutputShifter:	30 byte	18 byte
2 InputShifter:	34 byte	22 byte
3 MUX:	27 byte	18 byte

Pico:

NormalIO

RAM:   [=         ]   7.1% (used 18504 bytes from 262144 bytes)
Flash: [          ]   3.6% (used 74892 bytes from 2093056 bytes)

-> 2.018.164 bytes left

FastIO

RAM:   [=         ]   7.1% (used 18536 bytes from 262144 bytes)
Flash: [          ]   3.6% (used 75220 bytes from 2093056 bytes)

-> 2.017.836 bytes left

Device Buffer 1496 byte

Name Buffer with 1000 byte can be freed up

Bytes which are requested from the device buffer

Device	FastIO	NormalIO
26 Outputs:	52 byte	52 byte
26 Buttons:	156 byte	104 byte
4 LEDSegment:	112 byte	88 byte
8 Encoder:	280 byte	248 byte
6 Stepper:	84 byte	84 byte
8 Servos:	184 byte	184 byte
2 LCD:	36 byte	36 byte
3 AnalogIn:	87 byte	87 byte
4 OutputShifter:	60 byte	36 byte
4 InputShifter:	68 byte	44 byte
4 MUX:	36 byte	24 byte

Time consumption

Atmega | Pico (measurements from month ago)

	Atmega NormalIO	Atmega FastIO	Pico NormalIO	Remark
Outputs	11 us	11 us		only writing one output, analogWrite(), no changes
Buttons	9 us	3 us	2 us	only reading one input
	224 us		220 us (??)	reading AND evaluating one input, must be wrong for the Pico
LEDSegment	6.3 ms	1.3 ms	1.3 ms	2x8 daisy chained
Encoder	23 us	10 us	3 us	only reading one encoder
	290 us		22 us	reading AND evaluating one
Stepper	23 ms	23 ms	3 us	not changed to FastIO
Servos
LCD	12 ms	12 ms	9.7 ms	limited by I2C
AnalogIn	122 us	122 us	11 us	calculating average value
OutputShifter	0.74 ms	0.16 ms		4x8bit daisy chained
InputShifter	0.5 ms	0.14 ms		4x8bit daisy chained
MUX	2.4 ms	0.9 ms		4 x 16 bit
			Pico (measurements from month ago)

Readin time for Encoders:

1ms: actual status, works with only very very less detection of wrong direction for fast turning
2ms: very less detection of wrong direction for fast turning -> OK
3ms: less detection of wrong direction for fast turning
4ms: same as 3ms
5ms: slow turning is OK, fast turning with multiple detection of wrong direction
10ms: even slow turning does not work

Summary:

Mega does not have any Flash or RAM limitations for now.
ProMicro has 756 bytes in Flash and 600 bytes in RAM left
- very likely that no additional device will fit into the Flash
Uno/Nano has 5.122 bytes in Flash and 275(263) bytes in RAM left
- at least the name buffer of 220 bytes are required for additional devices
- 506 bytes could be used -> 16(14) encoder can be used. 6 are available on I/O's (18 pins - 5 pins from MUX device) so 10(8) encoders could be connected to an MUX
Pico has plenty Flash and RAM, no limitations for now.

(numbers in() are for FastIO)

Consequences for encoders:

Encoders on MUX are possible for Mega and Pico, Fast IO could be used from sight of memory and is usefull at least for the Mega (8Mhz!) due to the amount of possible devices. For now 20 encoders can be defined for the Mega, if really more encoders are required the maximum could be increased (connected to I/O's).
for SimVim users (using a Mega) encoders on MUX are helping to move to Mobiflight
for Pico users (very limited for now) it could be a requirement in the future
Encoders on MUX for the Uno/Nano is limited (due to RAM consumption and available pins) to one MUX with 8 encoders and 6 encoders connected to I/O's.
Encoders should be read in within 2ms, delays due to output devices are acceptable but the main loop time should not be exceeded

CMD-Messenger

Explanations

Buttons

Some Theory