# Timer

## Timer

The timer will give off audible alarm when the time is up.

![](https://kittenbothk-eng.readthedocs.io/en/latest/_images/timer.jpg)

### Building Instructions

[Building Instructions(Right Click->Save As)](https://github.com/kittenbothk/kittenbothk/raw/master/Kits/future_inventor/instructions/pdf/timer.pdf)

### Sample Wiring Diagram

![](https://kittenbothk-eng.readthedocs.io/en/latest/_images/timer_wire.png)

### Sample Program

#### KittenBlock Sample Program

![../../../\_images/timer\_code.png](https://kittenbothk-eng.readthedocs.io/en/latest/_images/timer_code.png)

[Download Sample Program(Right Click->Save As)](https://github.com/kittenbothk/kittenbothk/raw/master/Kits/future_inventor/instructions/sb3/timer.sb3)

#### Python Sample Program[](https://kittenbothk-eng.readthedocs.io/en/latest/Kits/future_inventor/instructions/timer.html#python-sample-program)

```
#/bin/python

from time import sleep
from future import *
from sugar import *
import robotbit

angle = 0
end_time = 0
z = 0


def countdown():
  global angle,end_time,z

  if sensor.btnValue('a'):
    LED("P1").state('ON')
    LED("P2").state('OFF')
    while not (end_time == 0):
      sleep(1)
      end_time += -1
      angle += 1
      screen.clear()
      screen.fill((0, 0, 0))
      screen.textCh(str(end_time)+str("min"),5,10,2,(0, 255, 0))
      screen.refresh()
      robot.geekServo2kg(1, angle * 12)
      if end_time == 0:
        LED("P1").state('OFF')
        LED("P2").state('ON')
        while not sensor.btnValue('b'):
          buzzer.melody(CORRECT)
          sleep(0.2)
    LED("P1").state('OFF')
    LED("P2").state('OFF')



def valmap(x, in_min, in_max, out_min, out_max):
    return int((x-in_min) * (out_max-out_min) / (in_max-in_min) + out_min)


robot = robotbit.RobotBit()

screen.sync = 0

LED("P1").state('OFF')

LED("P2").state('OFF')

while True:
  angle = (round(valmap(Angle("P0").value(), 0, 4095, 180, 0) / 12))
  end_time = (round(valmap(Angle("P0").value(), 0, 4095, 0, 15)))
  robot.geekServo2kg(1, angle * 12)
  screen.fill((0, 0, 0))
  screen.textCh(str(end_time)+str("min"),5,10,2,(255, 0, 0))
  screen.refresh()
  countdown()
```

[Download Sample Program(Right Click->Save As)](https://github.com/kittenbothk/kittenbothk/raw/master/Kits/future_inventor/instructions/py/timer.py)

### Program Instructions

Turn the potentiometer to set the time, press A to start the timer. Press B to stop the timer when the time is up.


---

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