BenchChapter 3: Chains and rings

B02DIMMER

The task

P0 is a PWM pin: OUT P0 sets the share of each period it spends high, 0 to 100 percent.

R1 and C1 smooth the pulses into a steady voltage on CH1.

Hold CH1 at 3 volts. The supply is 5 volts.

The chip's ports, each with its kind and the parts its signal reaches. Cyan reads, lemon writes.

A duty of 100 percent gives the full 5 volts; 50 percent gives half.

Each hint goes a step further than the one before. Open them one at a time.

Hint 1Show

MOV A, 50 sets A to 50, and OUT P0 then sets the duty.

Hint 2Show

3 volts is three fifths of the supply.

Reveal the Full SolutionThe complete program for DIMMER. Open it only when you want the answer.

The game's own solution. It passes every test and scores exactly par on every benchmark.

u1SC-2 standard

MOV A, 60
OUT P0