BenchChapter 7: Frames and loops

B49QUANTIZER

The task

P0 reads a triangle wave. Round each reading down to a quarter of the supply,

0, 25, 50, 75, or 100 percent, and put it out on P1, so CH2 climbs and falls in steps.

The board

The chip's ports, each with its kind and the parts its signal reaches. Cyan reads, lemon writes. On a narrow screen, scroll the board sideways to see all of it.

Sources: V1 2.5 V triangle at 25 Hz and V2 2.5 V
Resistors: R1 1 kΩ
Capacitors: C1 1 µF
Probes: CH1 and CH2

Key idea

DIV 25 throws away the remainder.

Hints

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

Hint 1Show

MUL 25 turns the number of quarters back into a percent.

Hint 2Show

A reading of 60 becomes 2 quarters, and a duty of 50.

Solution

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

The reference program

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

Round each reading down to a quarter.

u1SC-2 standard

IN P0
DIV 25
MUL 25
OUT P1

CYCLES: 800; at par
ENERGY: 1600; at par
NODES: 1; at par
INSTRUCTIONS: 4; at par