Forum >Ckerokey Questions
Ckerokey Questions
chrisl01 2014-02-05 07:18:57 5968 Views3 Replies I've gotten the Cherokey 4WD robot kit and assembled it and have it working with no issues. But lots of questions.
1. I'd like to have a separate battery to drive the motors... something with a little more kick. Can you suggest a battery and wiring harness plus how I might split the power supplies on the motor driver board?
2. I've not had much luck making the robot rotate (left wheels running forward and right wheels running backwards)... is this a viable option for turning the robot or do I need to kind of go back and forth with the left and right wheels running at different speeds to make a turn happen?
Thanks.... feedback appreciated!
Chris
1. I'd like to have a separate battery to drive the motors... something with a little more kick. Can you suggest a battery and wiring harness plus how I might split the power supplies on the motor driver board?
2. I've not had much luck making the robot rotate (left wheels running forward and right wheels running backwards)... is this a viable option for turning the robot or do I need to kind of go back and forth with the left and right wheels running at different speeds to make a turn happen?
Thanks.... feedback appreciated!
Chris
2014-02-11 07:57:57 Jose:
Thanks for following up. I visited my local hobby shop and procured a 7.4V NiMh 300 mAh battery and the Cherokey is flying! Everything works great now. I am just surprised that the included battery holder does not provide the needed juice to run a board along with the motors very robustly.
While I've got your attention, I also wanted to bounce something off of you. The PWM input for speed control seems to be expecting a 5V signal. Some of the boards I am using are 3.3v and they seem to work just fine. Since it is a PWM signal, I am guessing it is looking at the cycle time more so than the voltage. 3.3V seems to be high enough for it to register High. I have run it 3.3V direct and through a logic level shifter with identical results... thoughts? 3.3V good enough to drive the PWM inputs for speed control? chrisl01
Thanks for following up. I visited my local hobby shop and procured a 7.4V NiMh 300 mAh battery and the Cherokey is flying! Everything works great now. I am just surprised that the included battery holder does not provide the needed juice to run a board along with the motors very robustly.
While I've got your attention, I also wanted to bounce something off of you. The PWM input for speed control seems to be expecting a 5V signal. Some of the boards I am using are 3.3v and they seem to work just fine. Since it is a PWM signal, I am guessing it is looking at the cycle time more so than the voltage. 3.3V seems to be high enough for it to register High. I have run it 3.3V direct and through a logic level shifter with identical results... thoughts? 3.3V good enough to drive the PWM inputs for speed control?
chrisl01 2014-02-09 21:06:40 Hello Chris,
We need a picture of your wiring, and details of your power supply.
If you got some issues with the code, you also need to let us know what code you are using. Is it the wiki code? Have you added something on it? perhaps you can show it to us.
I've used the lipo battery with pretty good results:
[url=https://www.dfrobot.com/index.php?route=product/product&filter_name=lipo&product_id=489#.UvcLeNJdXfI]Lipo 7.4 2200mAh [/url]
For controlling the speed, if battery is wired and has enough juice you want to increase the PWM. Jose
We need a picture of your wiring, and details of your power supply.
If you got some issues with the code, you also need to let us know what code you are using. Is it the wiki code? Have you added something on it? perhaps you can show it to us.
I've used the lipo battery with pretty good results:
[url=https://www.dfrobot.com/index.php?route=product/product&filter_name=lipo&product_id=489#.UvcLeNJdXfI]Lipo 7.4 2200mAh [/url]
For controlling the speed, if battery is wired and has enough juice you want to increase the PWM.
Jose 2014-02-06 17:29:48 I watched the video of the Ckerokey on the product page and I am not getting speeds like those shown in the video. Can somebody tell me if the batteries need to be replaced with a 7.6v LIPO to get that kind of performance? I am using the onboard motor controller to drive all 4 motors. I have fed both PWM inputs with 5 volts directly and from my Netduino and SparkCore through a logic level converter. It crawls and doesn't get enough juice to spin. Anybody have success with this kit getting it to go fast like the video? chrisl01
chrisl01 