Better exhaust, slower head speed, more blades. Other ideas?
• 4.5: Payload improvement Larger engine, higher head speed, more blades, flat bottomed blades. 5: Servos • 5.1: Servo overview This is not a review of any particular servo make or model. Instead it is about the technical interfacing details. • 5.2: Parallel driver Our Rev 1.0 board used eight digital output lines from the microcontroller to drive eight servos. A timer interrupt switched the lines on and off as needed. This worked fairly well, as long as the interrupt was serviced promptly and as long as no more servos were required. Any latency in servicing the interrupt would cause servo jitter. It also used an entire eight bit port, which was “expensive” in MCU resources. • 5.3: Decade counter driver The 2.x boards use a 4017 decade counter to drive the servos instead. The clock signal for the 4017 is generated by the timer output compare hardware, so the interupt servicing is no longer “real time”. The MCU clocks the 4017 and eventually we get around to updating the timer for the n
