B14SQUARE
The task
P0 drives the base of Q1 through R1. While P0 is high, Q1 pulls CH1 down.
R2 pulls CH1 up to 5 volts while Q1 is off. P1 ticks every 10 cycles.
Make a square: two ticks with P0 high, then two with it low.
The board
- Sources
- V1 5 V
- Resistors
- R1 10 kΩ and R2 1 kΩ
- Transistors
- Q1, an NPN transistor
- Probes
- CH1
Key idea
Q1 inverts, so a high on P0 is a low on CH1. The band follows CH1.
Hints
Each hint goes a step further than the one before. Open them one at a time.
Hint 1Show
The level holds while you sleep. Two sleeps at one level make two ticks.
Hint 2Show
Sleep, write 1, sleep twice, write 0, sleep twice.
Solution
Reveal the Full SolutionThe complete program for SQUARE. 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.
Two ticks high, two ticks low, on the inverter.
u1SC-2 standard
IN P1
MOV A, 1
OUT P0
IN P1
IN P1
MOV A, 0
OUT P0
IN P1
IN P1- CYCLES
- 36
- at par
- ENERGY
- 72
- at par
- NODES
- 1
- at par
- INSTRUCTIONS
- 9
- at par