RC KRISYS Robot

I used a JRSport Transmitter and receiver to control a KRISYS v4.1 motor driver board. The board has a dsPIC33 that controls the motors with a PWM signal and (2 channels per motor) and 2 ADC channels to read the PWM signal from the receiver. The receiver outputs a small pwm signal to control a servo. The signal is fed into a low pass filter to smooth out the signal so it can be read with the ADC channels. I tried reading the PWM signal as is and had issues with some directions. The filter and analog read fixed those issues.

This setup will be used to control a much larger robot for display to High School students. The students will then go through several workshops to learn how to program and assemble the robot to follow a line on the ground.

Category:

Science & Technology

Tags:

• TAMU
• ETID
• KRISYS
• RC
• robot
• JR
• Sport
• remote
• controlled
• MISL

[oehrlein49]

If you need to get rid of the lag, you can use the capture-compare module on the PIC to measure the duty cycle of the PWM out of the receiver. You could just get rid of the low-pass filters then.

Nice work though!

[Spanky85]

@oehrlein49 I actually got rid of the lag in a different way. I had a 500ms delay that would occur when going from forward to reverse so I decreased it to 50ms. Now the platform has no noticeable lag. I also removed the hard right and left turns that had the motors go in opposite directions. Now one motor goes to 0% duty cycle while the other goes 100%. I was told about the input capture by a co-worker and it sounds like it will be faster and allow for proportional control.

[justlivemyway]

If I had to buy a ready made 4 channel transceiver module of 2.4 Ghz and use it for an rc toy that has servos that need PWM then how do I go about building the whole thing?

Do I need to make programming?

How to upload data that I have programmed into the Transceiver module?

Is the transceiver partly a micro controller, in which data can be stored?

[elgus]

was it proportinal?