This is my First DIY project that i uploaded on the internet. It came from the idea of making an RC prototype that is fast enough on uphill and bumpy roads.
And the concept of the project is
- USE JUNK as raw materials for almost all parts
- USE PARTS THAT IS ONLY AVAILABLE ON MY SHOP, if i need to buy some parts it must be cheap
- NO MACHINE FABRICATIONS INVOLVED
- NO SERVO MOTORS WERE USED FOR STEERING ( SERVO MOTORS ARE COMMON TO RC MODELS)
- 4.5 VOLT RECEIVER FROM A BASIC RC TOY
- THE POWER NEEDS TO BE LARGER THAN THE REQUIRED POWER OF THE RECEIVER BUT WITH THE EXEMPTION OF AVOIDING THE
RECEIVER TO BE DESTROYED.
- It must be finished by using only basic tools.
- Control range must be increased.
- Automatic camber adjusting steering
- RECYCLED MOBILE PHONE BATTERIES MUST BE USED (because i have a lot of those, and its easy to beg for friends for batteries
- and most of all, make it unique and one of a kind design.
I designed it based on THE RAW MATERIALS AND PARTS THAT IS ONLY AVAILABLE ON MY SHOP SO I END UP WITH THIS DESIGN. it has a top speed of 30kph and a battery life of 30mins even though IT WAS USING RECYCLED BATTERIES FROM MOBILE PHONES.
On the transmitter-receiver part, there were limitations on the design of those parts that i used. It came from a China made rc toy which is powered by 3 AA size batteries, making it 4.5 volts. And its transmitter was 3 volts, which gives a range of only 5 meter radius. So to be able to increase the range modification was done by amplifying the signal to the receiver.
On its propulsion design, it operates its small motor by a 8050 transistor which is triggered by a signal from the transmitter.
8050 transistor is a NPN type transistor which is only limited to 25 volts and 1A of load. Overloading will destroy this part and other components on the receiver but i need more juice to make this thing fast uphill because the whole assembly will weight more than 2kgs.
After brainstorming and testing i came up with the part that can make this thing possible to get faster by having a high powered input considering the limitations of the receiver. And the electric motor's power gives the rear wheels a reasonable rpm but enough torque to make this thing go uphill by designing a gearbox by playing with this equation
D1N1 = D2N2
This equation is used for computing the gear ratios by using speed(rpm), torque,# of teeth of the pinion gear, # of teeth of the driven gear, Ø of the driving gear, Ø of the driven gear. The gearbox was made without fabricating gears. I only used existing gears which came out from old toys and build the drive-train by following on what came out of my computations.
The hard part on building this prototype is the steering mechanism. The steering mechanism needs to be operational during running especially during braking process just like a simple car. During braking process, the car shifts its weight up to the front making the car hard to steer. And also the Camber of the front wheels needs to be negative automatically during steering so it will steer easily during downhill at high-speeds. There are standard steering and suspension mechanisms used on vehicle steering which is also adapted to RC toy design but to be able to attain the automatic camber steering adjustment concept, i decided to design the steering mechanism without adapting standard steering mechanisms.
With the help of the improvised suspension from which the springs came out of a motorcycle bulb hub, the automatic camber adjustment during steering makes it possible. And putting springs at the back makes the run more manageable on bumpy terrains.
I also play with it during the night so i decided to make a lighting system for it which is operated by a NE555 timer IC. it uses standard design, which is modified to get the select-able sequence output.
The video below shows the test runs and after it was finished. The prototype was later improved by making the propulsion design more powerfull by using 2 motors, a better grippy and stable tires from thick rubber bands, and a little improvement on the battery casing making it look like having a little compartment at the truck bed. Unfortunately the prototype's improvement was unpublished on the web.
Play the video below to see how it runs.
And the concept of the project is
- USE JUNK as raw materials for almost all parts
- USE PARTS THAT IS ONLY AVAILABLE ON MY SHOP, if i need to buy some parts it must be cheap
- NO MACHINE FABRICATIONS INVOLVED
- NO SERVO MOTORS WERE USED FOR STEERING ( SERVO MOTORS ARE COMMON TO RC MODELS)
- 4.5 VOLT RECEIVER FROM A BASIC RC TOY
- THE POWER NEEDS TO BE LARGER THAN THE REQUIRED POWER OF THE RECEIVER BUT WITH THE EXEMPTION OF AVOIDING THE
RECEIVER TO BE DESTROYED.
- It must be finished by using only basic tools.
- Control range must be increased.
- Automatic camber adjusting steering
- RECYCLED MOBILE PHONE BATTERIES MUST BE USED (because i have a lot of those, and its easy to beg for friends for batteries
- and most of all, make it unique and one of a kind design.
I designed it based on THE RAW MATERIALS AND PARTS THAT IS ONLY AVAILABLE ON MY SHOP SO I END UP WITH THIS DESIGN. it has a top speed of 30kph and a battery life of 30mins even though IT WAS USING RECYCLED BATTERIES FROM MOBILE PHONES.
On the transmitter-receiver part, there were limitations on the design of those parts that i used. It came from a China made rc toy which is powered by 3 AA size batteries, making it 4.5 volts. And its transmitter was 3 volts, which gives a range of only 5 meter radius. So to be able to increase the range modification was done by amplifying the signal to the receiver.
On its propulsion design, it operates its small motor by a 8050 transistor which is triggered by a signal from the transmitter.
8050 transistor is a NPN type transistor which is only limited to 25 volts and 1A of load. Overloading will destroy this part and other components on the receiver but i need more juice to make this thing fast uphill because the whole assembly will weight more than 2kgs.
After brainstorming and testing i came up with the part that can make this thing possible to get faster by having a high powered input considering the limitations of the receiver. And the electric motor's power gives the rear wheels a reasonable rpm but enough torque to make this thing go uphill by designing a gearbox by playing with this equation
D1N1 = D2N2
This equation is used for computing the gear ratios by using speed(rpm), torque,# of teeth of the pinion gear, # of teeth of the driven gear, Ø of the driving gear, Ø of the driven gear. The gearbox was made without fabricating gears. I only used existing gears which came out from old toys and build the drive-train by following on what came out of my computations.
The hard part on building this prototype is the steering mechanism. The steering mechanism needs to be operational during running especially during braking process just like a simple car. During braking process, the car shifts its weight up to the front making the car hard to steer. And also the Camber of the front wheels needs to be negative automatically during steering so it will steer easily during downhill at high-speeds. There are standard steering and suspension mechanisms used on vehicle steering which is also adapted to RC toy design but to be able to attain the automatic camber steering adjustment concept, i decided to design the steering mechanism without adapting standard steering mechanisms.
With the help of the improvised suspension from which the springs came out of a motorcycle bulb hub, the automatic camber adjustment during steering makes it possible. And putting springs at the back makes the run more manageable on bumpy terrains.
I also play with it during the night so i decided to make a lighting system for it which is operated by a NE555 timer IC. it uses standard design, which is modified to get the select-able sequence output.
The video below shows the test runs and after it was finished. The prototype was later improved by making the propulsion design more powerfull by using 2 motors, a better grippy and stable tires from thick rubber bands, and a little improvement on the battery casing making it look like having a little compartment at the truck bed. Unfortunately the prototype's improvement was unpublished on the web.
Play the video below to see how it runs.