Smooth LED fading via PWM

[Ioannis]

For any N-Channel small MosFet needs (up to 2A) have a look at the Si2308 too. It is working fine from 4.5 Volts with Rds of 0.192 and Id of 2.1 Amp.


And the best P-Channel Power Mosfet I have find maybe is the SUM110P04-05-E3. Usually the P-channel have high Rds and low Id specs.

Ioannis

[HankMcSpank]

actually, I was mistaken the RDS of my Mosfet is about 0.7 Ohms.

I bought these P channel Mosfets when CPC Farnell were clearing them out for about 5p each...

http://www.farnell.com/datasheets/468737.pdf

I think I bought about 100 ....I couldn't believe it when they arrived...every Mosfet was sealed individually in a 5cm plastic bag, & then inside the plastic bag, each MOSFET was then sealed in it's SMD wrapping! It takes me more time to get to the mosfet than to make my PCB!

[HankMcSpank]

Ok, I missing somethinh fundamental here...wondering if anyone can embarrass me!

I'm putting some data into eeprom...

data  0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, _
1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, _
2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4, _
4,4,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,7,7,7,7,7,7,8,8, _
8,8,8,8,9,9,9,9,10,10,10,10,10,11,11,11,11,12,12,12, _
13,13,13,13,14,14,14,15,15,15,16,16,16,17,17,18,18,18, _
19,19,20,20,20,21,21,22,22,23,23,24,24,25,26,26,27,27,28, _
29,29,30,31,31,32,33,33,34,35,36,36,37,38,39,40,41,42,42, _
43,44,45,46,47,48,50,51,52,53,54,55,57,58,59,60,62,63,64, _
66,67,69,70,72,74,75,77,79,80,82,84,86,88,90,91,94,96,98, _
100,102,104,107,109,111,114,116,119,122,124,127,130,133,136, _
139,142,145,148,151,155,158,161,165,169,172,176,180,184,188, _
192,196,201,205,210,214,219,224,229,234,239,244,250,252

note that last value 252....ok, when I read out the contents of eeprom...

Loc000: 000
Loc001: 001
Loc002: 001
Loc003: 001
Loc004: 001
Loc005: 001
Loc006: 001
Loc007: 001
Loc008: 001
Loc009: 001
Loc010: 001
Loc011: 001
Loc012: 001
Loc013: 001
Loc014: 001
Loc015: 001
Loc016: 001
Loc017: 001
Loc018: 001
Loc019: 001
Loc020: 001
Loc021: 001
Loc022: 001
Loc023: 001
Loc024: 001
Loc025: 001
Loc026: 001
Loc027: 001
Loc028: 001
Loc029: 001
Loc030: 001
Loc031: 002
Loc032: 002
Loc033: 002
Loc034: 002
Loc035: 002
Loc036: 002
Loc037: 002
Loc038: 002
Loc039: 002
Loc040: 002
Loc041: 002
Loc042: 002
Loc043: 002
Loc044: 002
Loc045: 002
Loc046: 002
Loc047: 002
Loc048: 002
Loc049: 002
Loc050: 003
Loc051: 003
Loc052: 003
Loc053: 003
Loc054: 003
Loc055: 003
Loc056: 003
Loc057: 003
Loc058: 003
Loc059: 003
Loc060: 003
Loc061: 003
Loc062: 003
Loc063: 004
Loc064: 004
Loc065: 004
Loc066: 004
Loc067: 004
Loc068: 004
Loc069: 004
Loc070: 004
Loc071: 004
Loc072: 004
Loc073: 004
Loc074: 005
Loc075: 005
Loc076: 005
Loc077: 005
Loc078: 005
Loc079: 005
Loc080: 005
Loc081: 005
Loc082: 006
Loc083: 006
Loc084: 006
Loc085: 006
Loc086: 006
Loc087: 006
Loc088: 006
Loc089: 007
Loc090: 007
Loc091: 007
Loc092: 007
Loc093: 007
Loc094: 007
Loc095: 008
Loc096: 008
Loc097: 008
Loc098: 008
Loc099: 008
Loc100: 008
Loc101: 009
Loc102: 009
Loc103: 009
Loc104: 009
Loc105: 010
Loc106: 010
Loc107: 010
Loc108: 010
Loc109: 010
Loc110: 011
Loc111: 011
Loc112: 011
Loc113: 011
Loc114: 012
Loc115: 012
Loc116: 012
Loc117: 013
Loc118: 013
Loc119: 013
Loc120: 013
Loc121: 014
Loc122: 014
Loc123: 014
Loc124: 015
Loc125: 015
Loc126: 015
Loc127: 016
Loc128: 016
Loc129: 016
Loc130: 017
Loc131: 017
Loc132: 018
Loc133: 018
Loc134: 018
Loc135: 019
Loc136: 019
Loc137: 020
Loc138: 020
Loc139: 020
Loc140: 021
Loc141: 021
Loc142: 022
Loc143: 022
Loc144: 023
Loc145: 023
Loc146: 024
Loc147: 024
Loc148: 025
Loc149: 026
Loc150: 026
Loc151: 027
Loc152: 027
Loc153: 028
Loc154: 029
Lo1155: 029
Loc156: 030
Loc157: 031
Loc158: 031
Loc159: 032
Loc160: 033
Loc161: 033
Loc162: 034
Loc163: 035
Loc164: 036
Loc165: 036
Loc166: 037
Loc167: 038
Loc168: 039
Loc169: 040
Loc170: 041
Loc171: 042
Loc172: 042
Loc173: 043
Loc174: 044
Loc175: 045
Loc176: 046
Loc177: 047
Loc178: 048
Loc179: 050
Loc180: 051
Loc181: 052
Loc182: 053
Loc183: 054
Loc184: 055
Loc185: 057
Loc186: 058
Loc187: 059
Loc188: 060
Loc189: 062
Loc190: 063
Loc191: 064
Loc192: 066
Loc193: 067
Loc194: 069
Loc195: 070
Loc196: 072
Loc197: 074
Loc198: 075
Loc199: 077
Loc200: 079
Loc201: 080
Loc202: 082
Loc203: 084
Loc204: 086
Loc205: 088
Loc206: 090
Loc207: 091
Loc208: 094
Loc209: 096
Loc210: 098
Loc211: 100
Loc212: 102
Loc213: 104
Loc214: 107
Loc215: 109
Loc216: 111
Loc217: 114
Loc218: 116
Loc219: 119
Loc220: 122
Loc221: 124
Loc222: 127
Loc223: 130
Loc224: 133
Loc225: 136
Loc226: 139
Loc227: 142
Loc228: 145
Loc229: 148
Loc230: 151
Loc231: 155
Loc232: 158
Loc233: 161
Loc234: 165
Loc235: 169
Loc236: 172
Loc237: 176
Loc238: 180
Loc239: 184
Loc240: 188
Loc241: 192
Loc242: 196
Loc243: 201
Loc244: 205
Loc245: 210
Loc246: 214
Loc247: 219
Loc248: 224
Loc249: 229
Loc250: 234
Loc251: 239
Loc252: 244
Loc253: 250
Loc254: 252
Loc255: 255

I get 252 as the 2nd to last number....with 255 being the final number (I'm guessing all 1s is a default value of unused eeprom slots?)

therefore there must be just 255 values in that table, but if I add another value on the end (the 256th slot) ...saya number of 253...

data  0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, _
1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, _
2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4, _
4,4,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,7,7,7,7,7,7,8,8, _
8,8,8,8,9,9,9,9,10,10,10,10,10,11,11,11,11,12,12,12, _
13,13,13,13,14,14,14,15,15,15,16,16,16,17,17,18,18,18, _
19,19,20,20,20,21,21,22,22,23,23,24,24,25,26,26,27,27,28, _
29,29,30,31,31,32,33,33,34,35,36,36,37,38,39,40,41,42,42, _
43,44,45,46,47,48,50,51,52,53,54,55,57,58,59,60,62,63,64, _
66,67,69,70,72,74,75,77,79,80,82,84,86,88,90,91,94,96,98, _
100,102,104,107,109,111,114,116,119,122,124,127,130,133,136, _
139,142,145,148,151,155,158,161,165,169,172,176,180,184,188, _
192,196,201,205,210,214,219,224,229,234,239,244,250,252,253

it won't compile (compiler says stack over flow)


So if there are only 255 values being stored in my eeprom, then why won't it let me squeeze in a byte to the final (256th byte) eeprom slot ...rather than defaulting the final value to 255?

Any ideas?