X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?p=bike-lights.git;a=blobdiff_plain;f=pins.txt;h=b6c188e2cc715df14e5208e9e7408e36d11a317e;hp=efb35b7b04a7490dccee9f3415ef31dc5e814ec2;hb=HEAD;hpb=1647725c8e3e1297a330e5ab18ad6033fec807dd

diff --git a/pins.txt b/pins.txt
index efb35b7..46763c5 100644
--- a/pins.txt
+++ b/pins.txt
@@ -1,25 +1,127 @@
-     (MOSI/DI/SDA/!OC1A/PCINT8) PB0 MOSI,SW2    SENSE2+ PA0 (ADC0/DI/SDA/PCINT0)
-          (MISO/DO/OC1A/PCINT9) PB1 MISO,PWM1  SENSE23- PA1 (ADC1/DO/PCINT1)
-   (SCK/USCK/SCL/!OC1B/PCINT10) PB2 SCK,LED2    SENSE3+ PA2 (ADC2/INT1/USCK/SCL/PCINT2)
-                 (OC1B/PCINT11) PB3 PWM2       --free-- PA3 (AREF/PCINT3)
+ATTiny 861A pin assignment
+==========================
+     (MOSI/DI/SDA/!OC1A/PCINT8) PB0 MOSI,SERIAL         PA0 (ADC0/DI/SDA/PCINT0)
+          (MISO/DO/OC1A/PCINT9) PB1 MISO,MODELED 5V_OUT PA1 (ADC1/DO/PCINT1)
+   (SCK/USCK/SCL/!OC1B/PCINT10) PB2 SCK,SW2   AMB_SENSE PA2 (ADC2/INT1/USCK/SCL/PCINT2)
+                 (OC1B/PCINT11) PB3 PWMLED1             PA3 (AREF/PCINT3)
                                 VCC                     AGND
                                 GND                     AVCC
-(ADC7/!OC1D/CLKI/XTAL1/PCINT12) PB4 LED1        SENSE1+ PA4 (ADC3/ICP0/PCINT4)
- (ADC8/OC1D/CLKO/XTAL2/PCINT13) PB5 PWM3        AMBIENT PA5 (ADC4/AIN2/PCINT5)
-         (ADC9/INT0/T0/PCINT14) PB6 SW1      VBAT_SENSE PA6 (ADC5/AIN0/PCINT6)
-          (ADC10/RESET/PCINT15) PB7 RST      VB_SEN_ENA PA7 (ADC6/AIN1/PCINT7)
-
-
-PWM1 - rear spotlight
-PWM2 - read wide light
-PWM3 - front light
-SENSE1
-SENSE2
-SENSE3
-Ambient sense
-Analog-on
-SW1 - on/off button
-SW2 - temporary light boost
-LED1
-LED2
+(ADC7/!OC1D/CLKI/XTAL1/PCINT12) PB4 STATUSLED           PA4 (ADC3/ICP0/PCINT4)
+ (ADC8/OC1D/CLKO/XTAL2/PCINT13) PB5 PWMLED2  LED1SENSE+ PA5 (ADC4/AIN2/PCINT5)
+         (ADC9/INT0/T0/PCINT14) PB6 SW1     LED12SENSE- PA6 (ADC5/AIN0/PCINT6)
+          (ADC10/RESET/PCINT15) PB7 RST      LED2SENSE+ PA7 (ADC6/AIN1/PCINT7)
 
+MISO
+MOSI
+SCK
+RST
+
+LED1 PWM
+LED1 SENSE, diff/gain 8
+
+LED2 PWM
+LED2 SENSE, diff/gain 32
+
+AMBIENT SENSE, single-ended
+BATT-V SENSE, single-ended
+
+STATUS LED (PWM?)
+
+BRAKE HALL OUT
+BRAKE HALL IN
+
+SW1
+SW2
+
+
+Components
+==========
+PWM1 LED1 rear spotlight: step-down, differential SENSE1
+PWM2 LED2 rear LED strip: step-up,   differential SENSE2
+PWM3 LED3 front light:    step-down, single-ended SENSE3, inverted stride
+
+SENSE4 - ambient light sensor,   single-ended
+SENSE5 - battery voltage sensor, single-ended
+
+LED4 - status LED (green)
+LED5 - error LED (red)
+
+LED6 - speedometer illumination LED
+LED7 - front UV LED
+
+SW1 - on/off; mode switch
+SW2 - temporary light boost or whatever
+
+
+ADC Gain
+========                                                  0.033R sensign res.
+single-ended resolution:          0.001074 V .. 1.1000 V  32.55 .. 33333 mA
+differential resolution  8x gain: 0.000134 V .. 0.1375 V   4.06 ..  4166 mA
+differential resolution 20x gain: 0.000054 V .. 0.0550 V   1.64 ..  1666 mA
+differential resolution 32x gain: 0.000036 V .. 0.0344 V   1.09 ..  1042 mA
+
+analog input resistance 100 MOhm
+
+
+PWM LED current sense
+=====================
+0.033R sensing resistor:
+                       max gain    min gain
+   20 mA => 0.00066 V              8x
+  100 mA => 0.0033 V
+  150 mA => 0.0050 V
+  300 mA => 0.0099 V               Power burned at sensing resistor:
+  350 mA => 0.0116 V               0.004 W
+  700 mA => 0.0231 V               0.016 W    
+ 1000 mA => 0.0330 V   32x         0.033 W
+ 1500 mA => 0.0495 V   20x         0.074 W
+ 2000 mA => 0.0660 V    8x         0.132 W
+ 3000 mA => 0.0990 V    8x         0.297 W
+
+Battery sense
+=============
+range 5-15 V
+1.5M..100k
+
+voltage    current   sense voltage
+15V:       9.3 uA    0.94 V 
+12V:       7.5 uA    0.75 V
+ 5V:       3.1 uA    0.31 V
+
+Ambient light sensor
+====================
+5 V, 1M5 resistor + photodiode: voltage at the photodiode
+darkness: 3.71 V => 4.31 MOhm
+bathroom without lights, only outside lights: 3.68 V => 4.18 MOhm
+kitchen light: 3.29 V => 2.89 MOhm
+room 30min before midnight: 0.26 V => 82 KOhm
+outside 30min before midnight: 0.05 V => 15 KOhm
+bathroom halogen lights 0.02 V => 6 KOhm
+battery light: 0.01 V => 3 KOhm
+
+Use 1M5 main resistor + 300K sensing resistor, 1.1V single-ended sense
+
+Expected         voltage     ADC readings
+darkness:        0.244 V     226.8
+bathroom:        0.249 V     231.8
+kitchen light:   0.318 V     296.2
+halogen light:   0.831 V     773.1
+battery light:   0.832 V     774.5
+
+Plain LEDs
+==========
+@5 V source
+20 mA/3V: 100 R resistor
+20 mA/2V: 150 R resistor
+ 2 mA/2V: 1K5 resistor
+
+Battery idle current
+====================
+2000 mAh: 1.0 mA -> 83 days capacity
+2000 mAh: 0.1 mA -> 833 days capacity
+
+Converter reaction
+==================
+step-up: 4-5 adc measurements to ADC voltage increase
+step-down 2: 1-2 ---""---
+timer: 34-38 ADC measurements per jiffy (200 Hz)