CH1: Air Pressure CH2: Auxillary Voltage CH3: IHU Voltage CH4: IHU Temperature CH5: Open CH6: External Temperature CH7: Internal Temperature CH8: Servo Voltage To convert air pressure, subtract 593 from the count and then compare to initial count (taken at the surface). For the voltages, divide by 1000 and that will give the value in volts. Note, voltages first go through a voltage divider to bring them below 4.096 volts, which is the maximium the ADC can handle. Most voltages are divided in half. Aux voltage is for optional devices like ATV. Servo voltage is for operating servos. For temperatures, divide the value by 10 and you'll have the temperature in Kelvins. IHU refers to the main control board in the capsule, its brains. There are temperature sensors on the IHU, one inside the capsule, and one outside. CH5 is open for future use. Lloyd