Measure distance

Checks

Run your code to check it. The checks replay a fixed script on a virtual clock, so the same code always gets the same result.

1. At the start it reads 30 cm at least 5 times within a second · Not checked yet
2. Move the obstacle to 12 cm and it reads 12 cm · Not checked yet
3. At 45 cm it reads 45 cm · Not checked yet
4. Out of range, the echo times out and it prints 0 cm · Not checked yet
5. The code times the echo with pulseIn() · Not checked yet

Break it

Each fault really happens in the simulation. Trigger one, watch the figure, then read why.

• Adapter with the wrong polarityReverse polarityTrigger
• Reversed supply on the VIN pinReverse polarityTrigger
• Motor on the 5V pinBrown-outTrigger
• 24 V on the barrel jackWrong voltageTrigger
• Batteries nearly flatWrong voltageTrigger
• 9 V on the 5V pinWrong voltageTrigger
• Cold joint on the USB socketCold solder jointTrigger
• No resonator for the 328PMissing partTrigger
• No auto-reset capacitorMissing partTrigger
• The 328P in its socket backwardsPart in backwardsTrigger
• 5 V capacitor fitted backwardsPart in backwardsTrigger
• 5V shorted to GNDShort circuitTrigger
• 3V3 shorted to GNDShort circuitTrigger
• LED with no resistorOvercurrentTrigger
• LED in backwardsPart in backwardsTrigger

Inputs

Play the world: press, slide and turn the parts while the code runs.

• Distance to the obstacle
  30 cm

Parameters

Change a value here or click a chip in the code.

• Measure every
  100 ms
• Obstacle

  Toy carCardboard boxBallWall

  Hard and flat at the front: a clean echo.