„README.md“ ändern

README.md

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+## RGB LED Thermometer
+
+### Changelog
+
+- 18.02.17:
+  CHANGE: Add EEPROM_DEBUG defined block. Need to be compiled with -O3 Flag
+  INFO:   ledcolor==3 block is obsolete. Could be removed to save space
+- 23.06.17:
+  CHANGE: comment out ledcolor==3 block
+          reduce brighness to 100 for green and red
+  INFO:   MicroCore 1.0.2 creates very small binary, suspious
+- 25.05.18:
+  CHANGE: reduce the used flash
+  ADDED:  max red temp per session
+  FIXED:  lowered red, green led intensity
+
+### Improvement
+
+1. bug fix where Blinking RED would not change led_color back --> global/local definiton
+2. different PCB-Layout, to omit led flickering while flashing
+
+
+### Chip settings
+
+ATMEL ATTINY13_20 / ARDUINO
+
+Clock frequency: Default internal clock (9.6MHz / 8 = 1.2MHz) \
+BOD 4.3V \
+GCC -Os LTO enabled --> 746 Bytes \
+Global variables: 7 Bytes \
+ avrdude -c usbasp -p attiny13 \
+ Fuse 0x6A 0xF9 \
+ Fuse 0x3F
+
+                      +--------+
+       [ RST    (PB5) |1*     8| (VCC)  Power ]
+       [ Temp   (PB3) |2      7| (PB2)   RED  ]
+       [  NC    (PB4) |3      6| (PB1)  GREEN ]
+       [ Ground (GND) |4      5| (PB0)   BLUE ]
+                      +--------+
+
+Fuse Settings \
+CKSEL1..0: 11 - 128kHz  --> HVSP!! \
+SUT1..0  : 10 - 14CK+64ms \
+CKDIV8   :  0 - CLK divided by 8 -> 16kHz --> HVSP!! \
+
+### NTC table and info
+  5 volts / 1024 units or, .0049 volts (4.9 mV) per unit \
+  measurement takes place at the engine oil tank drain bolt \
+
+  VDO Werte *DEPRECATED* \
+  55 °C @ 2k Ohm == 0,587V (120EA) \
+  65 °C @ 2k Ohm == 0,423V (87EA) \
+  70 °C @ 2k Ohm == 0,361V (74EA) \
+  75 °C @ 2k Ohm == 0,309V (63EA) \
+  80 °C @ 2k Ohm == 0,265V (55EA) \
+  90 °C @ 2k Ohm == 0,195V (40EA) \
+  100 °C @ 2k Ohm == 0,150V (30EA) \
+  120 °C @ 2k Ohm == 0,089V (18EA)
+
+  Koso linear NTC 10k @ 25  °C (guess) \
+  50 °C @ 2k Ohm == 3,41 V (696EA) \
+  55 °C @ 2k Ohm == 3,24 V (662EA) \
+  65 °C @ 2k Ohm == 2,88 V (589EA) \
+  70 °C @ 2k Ohm == 2,72 V (556EA) \
+  75 °C @ 2k Ohm == 2,54 V (518EA) \
+  80 °C @ 2k Ohm == 2,36 V (482EA) \
+  90 °C @ 2k Ohm == 2,06 V (420EA) \
+  100 °C @ 2k Ohm == 1,75 V (359EA) \
+  --------------------------------- \
+  110 °C @ 2k Ohm ==        (300EA) (guess) 
+
+  the manuel defines the optimal oil temp between 55 - 65  ° C. \
+  this device shows between 50 and 90 °C GREEN \
+  this device shows between 100 and 110 °C RED \
+  above 110 °C the emergency blinking starts \
+
+
+  max value so far: 0x019D = 413 EA ~88°C \
+
+### real life hacks
+- put the board into a 14mm tube
+- seal both ends with a plastic cork and put bee wax on it