Timer for Free Flight

Hi all modellers .

My son is interested in free-flight models so he built his first " Swallow " , and here the problem began . Setting fire to the fuse was out of the question.

Mechanical clocks are not available and if it is, either price is too high or its heavily worn-out.

I was looking for simple electronic clocks for kids starting their adventure with models. So I figured out that I have no choice but to build my own.

The idea that guided me:

- Easy to use

- Lightweight

- Reliable

- Long working on batteries ( all competitions )

- Easy- location of model after landing

- Compatibility with classic mechanical clocks

- And most importantly at an affordable price

After several attempts and consultations with experienced instructors I managed to create the timer. It is lightweight, small, easy to use, and most importantly for kids. It forgives mistakes and so far its reliable.

It is mounted in place of a mechanical clock using existing mechanization

The mounting of the model performed by my son (10 years old)

It is mounted in place of a mechanical clock using existing mechanization

And here are the Timer:

Here link to download the flyer

Technical Data :

• Power supply 3V-5V ( standard 1 Lipo cell)
• Weight 3,8g (clock)
• Dimensions 40 x 18 mm

Functionality :

• Setting up the time with micro switches
• Build-in sound generator to localize the model
• Change the direction of rotation of the servo

User manual

• Set up the DT time according to table presented below

	5 s	10 s	30 s	90 s	120 s	180 s	240 s	300s
DIP3	OFF	OFF	OFF	OFF	ON	ON	ON	ON
DIP2	OFF	OFF	ON	ON	OFF	OFF	ON	ON
DIP1	OFF	ON	OFF	ON	OFF	ON	OFF	ON

• DIP4 switch change the servo direction
• Switch on the power supply.
• The mechanism releasing the DT must be connected to servo the servo arm can be manually adjusted within natural range)
• Connect haul to hook while pressing START button, servo will be setup in neutral position (after releasing START button time
• counting start for the beginning)
• After hook release, the clock start the countdown time to activate the servo by turning by 90 degree from neutral position (left or right, depends on set up of DIP4)
• After a 30 sec from servo activation , the sound signal will be activated ( 1 sec sound , 5 sec interval) to allow the model localization.
• Sound is generated until the power supply is discharged or pressing the START button
• Working time with 100mA cell up to 12 hours.
  
  

  
  

  On request, individual software can be uploaded