diff --git a/TODO b/TODO
index 6601d81..120c40d 100644
--- a/TODO
+++ b/TODO
@@ -425,9 +425,14 @@ Bauteile fuer Platine:
 - Widerstaende:
   - 1K fuer LEDs
   - 10K fuer Pull-up (UART lines)
+  - 4K7/10K fuer Pull-up (I2C lines)
 - Kondensatoren:
   - 10 microF (fuer Spannungsregler)
   - 100nF (Abblockkondensatoren fuer Chips)
+- Chips:
+  - HT7333 (3V3 Spannungsregler
+  - 74LS21: Dual 4-Port AND Gate (OpenCollector Outputs)
+
 
 
 Memory Layout:
@@ -452,3 +457,88 @@ Interrupt-Vektoren:
 Next:
 - read/write FLASH
 
+
+
+
+
+
+
+
+; with temp1
+;                                 AtTiny84
+;                                 --------
+;                            VCC  1     14  GND
+;                            PB0  2     13  PA0
+;                            PB1  3     12  PA1  COM-DATA
+;                  /RESET    PB3  4     11  PA2
+;                  KEY1      PB2  5     10  PA3  LED
+;                  COM_ATTN  PA7  6      9  PA4  TWI-SCL
+;                  TWI-SDA   PA6  7      8  PA5
+;                                 --------
+
+
+
+; with temp2
+;                                 AtTiny84
+;                                 --------
+;                            VCC  1     14  GND
+;                            PB0  2     13  PA0
+;                            PB1  3     12  PA1  COM-DATA
+;                  /RESET    PB3  4     11  PA2  OWI
+;                  KEY1      PB2  5     10  PA3  LED
+;                  COM_ATTN  PA7  6      9  PA4
+;                            PA6  7      8  PA5
+;                                 --------
+
+
+
+; with pwm
+;                                 AtTiny84
+;                                 --------
+;                            VCC  1     14  GND
+;                            PB0  2     13  PA0
+;                  FAN1-IN   PB1  3     12  PA1  COM-DATA
+;                  /RESET    PB3  4     11  PA2  OWI
+;                  KEY1      PB2  5     10  PA3  LED
+;                  COM_ATTN  PA7  6      9  PA4  FAN2-IN
+;                  PWM1-OUT  PA6  7      8  PA5  PWM2-OUT
+;                                 --------
+
+
+
+; with optic door/window sensors
+;                                 AtTiny84
+;                                 --------
+;                            VCC  1     14  GND
+;                            PB0  2     13  PA0  DOOR-ADC1
+;                  DOOR-ADC2 PB1  3     12  PA1  COM-DATA
+;                  /RESET    PB3  4     11  PA2
+;                  KEY1      PB2  5     10  PA3  LED
+;                  COM_ATTN  PA7  6      9  PA4  TWI-SCL
+;                  TWI-SDA   PA6  7      8  PA5
+;                                 --------
+
+
+
+
+
+
+
+;              HT7333
+;              ------
+;               Vin  +-------+
+;                            = C (10 uF)
+;               Gnd  +-------+
+;                            = C (10 uF)
+;               Vout +-------+
+;              ------
+
+
+
+Timer_Run TODO:
+- disable interrupts
+- first handle internal counters and sample into internal flags
+- enable interrupts
+- call handlers (every10s etc) according to flags
+
+