Hello all, I just purchased a Minidragon plus2 board and would like to interface it with a 16x2 LCD display but I could not find where VCC and GROUND on the...
most lcds that i know of either parllel or serial .. i believe there are different methods to interface them. i prefer serial lcds to parllel though there...
... Most displays do not need the pot and work find with 0V. Some older displays that did require it just needed a small negative voltage which few board have...
The Minidragon plus2 board should have ports/pin already dedicated to the LCD. As posted earlier, check the schematic...did you purchase the board through...
justin lucas
jlucas134@...
Nov 14, 2009 2:12 pm
16533
Yes, I received the minidragon from Wytec, I know there are dedicated pins for LCDs but I would like to connect my LCD on a breadboard directly to port A. I've...
Standard pinout for a Hitachi 44780 (or compatible) based charcter display does have GND at pin 1 and VCC at pin 2 so you do have these correct. However, the...
Pending on which version you are using of the board determines what pins can be used. If you are using the Mini-dragon Rev F, then the schematic specifically...
justin lucas
jlucas134@...
Nov 15, 2009 7:35 pm
16536
Hi All I need some help?. I need help with writing a program to display a name on the lcd of the dragon 12 board. I am writing this program in assembly using...
Here is a web site for some examples for programming with the LCD and other periphals. Good luck. Justin "In theory, there is no difference between theory and...
justin lucas
jlucas134@...
Nov 18, 2009 2:01 am
16539
http://www.axman.com/?q=node/138 helps to include the website... Justin ... _________________________________________________________________ Windows 7: I...
justin lucas
jlucas134@...
Nov 18, 2009 2:17 am
16540
Hello, I am trying to control a Parallax Continuous Rotation Servo (#900-00008) using my MC9S12C128CFUE. I need to to use PWM to give a pulse 1.5ms(rest),...
defessler@...
Nov 20, 2009 7:55 pm
16541
There is a trim screw in the side of the servo. Set the pwm to 1.5ms and adjust the screw so that the servo stops moving. Then adjust the pwm and your servo...
I have been doing that. It refuses to turn any direction aside from clockwise. Do you see any issues with my code. This is what I have now. PWMPOL = 0x01;...
If your servo is chattering in its rotation, I would say that the frequency is wrong. If your servo continues to rotate, I would say that the PWM duty cycle is...
Its the mark to space you need to change, not the frequency. Regards, Darren From: 68HC12@yahoogroups.com [mailto:68HC12@yahoogroups.com] On Behalf Of ...
Can't verify all your settings, you didn't specify bus frequency. But if period setting is 5000 for 20ms, then duty cycle setting should be not 225, but...
If only the answer was so simple. I've tried various methods. My bus runs at 2MHz. I did try that for the duty cycle. I've tried various different prescaler...
... Don't you think it is so simple to not reply and not help at all? One finds a bug in your "I'll guess all my settings" -style code and the best you can say...
I forgot that PWMSCLA isn't power of two divider. Doesn't mean previous settings won't work, but duty cycle resolution can be improved a bit. 1E8 / 2^16 =...
I'll give that a try. I did not mean to offend you. I was just being somewhat playful and I've spent a great deal of time on this. I admit I am very new to the...
I am making progress with your advice, but I have to say my math skills are very lacking and I can not completely understand where you get getting your...
Oh, I'm very sorry. I wasn't drunk but something went mad. Of course 20ms is 0.02*2000000 = 40000 bus clock periods, not 1E8 8-). Prescaler is not required,...
I tried it with 40000 PWMPER and 3000 PWMDTY and it spins, but still only in 1 direction and doesn't rest at 3000. I think I need to track down an oscilloscope...
OK, let's look into datasheet. Is this the right one ?: http://www.parallax.com/Portals/0/Downloads/docs/prod/motors/900-00008-CRServo-v2.0.pdf From previous...
Alright. I finally have it working properly. I had the wheels in a carriage and I was unable to get the proper leverage on the calibration screw and it wasn't...
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