smiddle2012
- Aug 2, 2012
- 5
- Joined
- Aug 2, 2012
- Messages
- 5
Hey guys,
I am new to the forum. I hope this is the right section. Sorry if I ask some dumb questions, I am new to circuit design. This is for my first "no rules" pinewood derby. I wanted to know if anyone here knew of a simple transistor circuit I could build that will count how many times the wheel on the pinewood derby rotates. I was thinking something simple like a piece of foil on the wheel hits a piece of foil on the car, and that is one rotation.
When the car reaches X number, like 5 or 10, rotations, the motor I have hooked up to the car will start. I am going for a back to the future approach, when the car hits 8.8 ft/s well, you know the rest. Anyway, I have built simple circuits before but I am not sure how to do this, or even if I can with just transistors, caps, etc. If this is not do-able, any alternatives to getting the cars motor to start after the car starts rolling, that are still cheap, would be very welcome. Thanks in advance everyone, I love forums like this.
Sincerely,
SM
I am new to the forum. I hope this is the right section. Sorry if I ask some dumb questions, I am new to circuit design. This is for my first "no rules" pinewood derby. I wanted to know if anyone here knew of a simple transistor circuit I could build that will count how many times the wheel on the pinewood derby rotates. I was thinking something simple like a piece of foil on the wheel hits a piece of foil on the car, and that is one rotation.
When the car reaches X number, like 5 or 10, rotations, the motor I have hooked up to the car will start. I am going for a back to the future approach, when the car hits 8.8 ft/s well, you know the rest. Anyway, I have built simple circuits before but I am not sure how to do this, or even if I can with just transistors, caps, etc. If this is not do-able, any alternatives to getting the cars motor to start after the car starts rolling, that are still cheap, would be very welcome. Thanks in advance everyone, I love forums like this.
Sincerely,
SM