Are you absolutely sure you used the right pic with the right file? Sounds like a problem I had when I built mine and discovered I programmed the newer pic with the older (and incompatible) firmware
Printable View
Hi Marty
Thanks for your quick response.:cheers:
The chip I used is a PIC18F4525-I/P and I programed it with V2.11 and then V2.12, do you see any issues here?
Allan
I can't remember its been awhile. Do a search of this thread with my username. You have to be sure you match the pic.and firmware. I accidentally ordered the newer PIC and loaded the original firmware. It takes the firmware ok. Even appears to work and you get the error. I think you may have done the same thing I did. A friend of mine modified the code to work on the newer chip. I think Steve posted it here too. You'll have to.do some leg work in this thread to double check.
Sounds like your problem is solved. :-). Gotta make sure you match the program to the specified chip.
Hi Lucas,
I have now almost completed the pcb based on your design - I just need a sounder, cap and PIC to complete (they are on order). I have also made a keypad based on Khalid's design I am just wondering what the connections would be to your board? I have checked the connections to the keypad and know the matrix connections but am unsure of how they will connect to the main pcb. Have you any advice on this?
Best regards
Terry
Hi All,
Sorry to be a pain, but I know little about stepper motors, can anyone advise about this driver board on eBay. It is reasonable cheap and I am on a tight budget. Would it be ok for experimenting with small stepper motors or should I avoid like the plague?
On anoother note, I have redrawn Steve's final pcb to make the tracks and gaps a bit wider making it more suitable for toner transfer method (I thought that I should contribute something to the thread as there is so much help here). I have made a board using this with photo paper for the toner transfer, I then etched it in fresh ferric chloride solution and it came out pretty well - see thumbnail below. If anyone is interested I will publish the pdf which prints accurately the ic holder drops in nicely, however it needs verifiying, I have double checked it against Steve's design and it seems ok, but I would like it to be checked by others just in case I have made an error - I would hate it to be used without verification. So please could the members have a look and compare it with Steve's final design and let me have comments,
Let me know if you're interested,
Thanks and Best regards
Terry
Can you be more specific about what you mean by "experimenting with small stepper motors"?
The board to which you linked is a dual H-bridge which is suitable for driving two small DC brushed motors or a single stepper motor, but it does not contain the onboard logic to control the stepper motor coil energization sequence, so that logic must be provided by something else. What kind of "something else" did you have in mind?
The row and colums are indicated on Steve's schematic, the sequence is the same on my PCB.
Viewed from componentside and left to right:
R4 R3 R2 R1 C4 C3 C2 C1
These are very good DIY stepper drives:
http://users.skynet.be/ldt/CNC%20ele...THB6064AH.html :cheers:
Hello Lucas, Kwackers and Jhovel,
I have been a member on this forum for a little while. Most of the stuff done on this forum is way over my head (I'm still learning the art of turning and milling - no cnc stuff, yet) BUT I was refered to this thread by Jhovel (Thanks Joe)
First of all a big thankyou to Kwackers for sharing your project, hard work and precious time. As can be seen from the thread, many people have benefited from this project.
Also thankyou to Lucas for the modifications and making it a little easier for novice PCB makers like myself. I have used the press & peel method a number of times on other projects and have struggled to get reliable track widths less than about 30mil. Maybe it's my iron settings?
If I could ask a couple of questions:
To Lucas, I have a query about Q3, the transistor for the sounder. I note that you have it orientated flat side facing the 7805. This places the NPN emitter pin to the +5V rail. Is this correct?
To Kwackers: Looking at your schematic, the pin allocations for the keypad has me confused. The schematic at post No. 35 has different pin allocations to the diagram on post No. 33.
For example Post No.33 shows that connecting pins 22 & 27 yields (1) but post No. 35 shows its pins 30 & 19 to get (1)
To both Steve and Lucas, I'm not suggesting you guys have made a mistake, it's more about me trying to understand what I have done wrong!
I've been putting this project together slowly on the side for the last month (just a bit at a time) and it's nearly crunch time. Can't wait to see it come to life!
Thankyou guys so much for your help.
Simon
Hi dk,
I intend to use it with the rotary table indexer described on this thread and the experimenting I referred to will be in the program of the indexer, if as you say the board will drive a stepper it should be ok then as the indexer provides the logic?
Regards,
Terry