Recent blog entries for heribertor88

TSA has taught me how to appreciate knowledge and using what is absorbed in the classroom into constructing a complicated robot. Especially, my math and science classes. The 5th robot was constructed in a time period of 6 days before competition due to the late designs and last minute decisions which cost me dearly when TSA Nationals at Chicago, Illinois came up. As a result as an operator of such an expensive robot I did not practice or test the robot vigorously to the point of satisfaction in complete functionality. I completed the robot and tested the robot, which completely worked fine at home. Furthermore, the testing of the robot batteries at low voltages was not a problem as I thought. As a result, during competition, the robot failed to operate and function due to the use of practicing right before competition and draining the batteries to low voltage numbers. I charged batteries afterwards, thinking such voltage is still worthy, but I was wrong. As competition came up, the robot stopped functioning, but the arm kept functioning because the arm uses less voltage. In flipping the batteries from car to arm it worked fine, but sadly time was up after trying to fix it. From such losses, I can only say that it’s sadly for the best of my understanding in how I can only learn from my costly mistakes. In conclusion, the future brings even more competitions, which I’m already planning for. The only difference now is that I’m prepared with the knowledge of building a robot way before competition where I have time to practice and test the robot to fulfill my confidence in bringing the 1st place trophy home.

Upon arrival of the hotel at Chicago, IL the robot was damaged and in serious need of repair. The problem was a broken transistor on the circuit board. Such a circuit board could only be bought through a servo kit from Vex Robotics at a downtown Radio Shack. The part was about 20 dollars which I bought and fixed the robot on location. From disassembling, rearranging wires, to modifying the new circuit board to accommodate the wiring of the connector, which was a hassle the robot finally sprang into action. On top of that, the transit to the radio shack was on foot, which meant carrying the fragile robot. The grippers were broken as well through transit which was a quick fix with two screws and some worthy duck tape. During competition the robot worked like a charm until the robot completely shut down because the circuit board runs on a certain voltage and if it’s not met it completely shuts down. Therefore, I flipped the batteries and the little charm worked fine until time was up. In conclusion, this robot has been the latest one and hope for more to come. TSA has been a breeding ground for acquiring the knowledge that will help me advance in my soon to come career. TSA I know has helped me gain knowledge through my actions and not through the book. As a result, going through first hand experiences are truly the best.

Parts List:


2- Hitec HS805 BB servos

2- Heavy duty servo arms

16- 8/32 screws

12- 6/32 screws

36- ½ #4 screw

1- 30” by 34” feet ¼” plexi glass

4- 2.88” diameter foam tire

4- Custom made ¼” bore hubs

1- 2x2 feet 1/8” plexi glass board

2- #25 sprocket chain

4- ¼” bore ball bearings

12- 10/24 set scews

4- ¼” 1 inch shaft

1- roll of double sided tape

1- 1” white tape


1- Futaba 9 channel digital proportional radio with capac

2- 7.2v Tamiya connectors 18 awg

1- 1” electrical tape

1- servo reverser

1- servo extension

1- on/off switch for receiver

2- 6-24 volts gear head motors

1- Futaba 9 channel digital proportional radio with capac

2- Single H-Bridge controllers

1- 7.2 battery capacity 3300 mah

1- 8.4 battery capacity 3300 mah

1- 10 ft. of 5 awg servo wire

2- Modified Hitec HS 805 BB servo

1- Futaba 9 channel receiver

Technical Log

Radio frequency assignment:

75 mhz 9 channel radio for collection device

Radio uses channel 71

9 channel radio controls the complete robot including collection device. In total 5 channels out of 9 are used for complete operation of robot.

Servo assignment:

2 highly modified servos control the propulsion and guidance.

2 other Hitec HS-805BB servos are used to grip the ball

Arm control, in the elbow and wrist joint, is due to the gold gearhead motors which use H-bridge controllers, which act as a servo only without the case.

Battery Charging Information:

Radio battery charges in about 10 to 12 hours.

Guidance vehicle uses a 6 cell 3300 mah Ni-Mh battery which uses a one-hour charger.

The collection device uses a 7 cell 3300 mah Ni-Mh battery which also uses a one-hour charger.

The receiver uses a 6 volt 1100mah battery which charges in about 10 to 12 hours.

Operating Instructions:

Operated by only one 9 channel remote control.

Right joystick controls the guidance vehicle.

Left and the auxiliary flip switch control the collection device.

Vehicle power and transmission information:

Car is powered by a 6 cell battery.

Collection device is powered by a 7 cell battery.

The guidance control vehicle’s transmission 2 - 20:1 gear head ratio servos for torque for guidance control vehicle.

Share this page