using the l298 driver from OBEX

Pasha

Hello I just recently bought a Prop rpm to controll a robot i am building. I was planning to use the L298 chip with my chip using the driver from the OBEX, but I couldn't find any schematics specifically for Propeller. Maybe i just didn't look far enough, but anyway if anyone has one· I would like to find it.

I tried to build a L298 schematic i found for a PIC, but it didn't work at all.

Sapieha

Hi Pasha.

If it help You.

Ps. It is one sided PCB with a few straps on component side. Dioder must be Shotky in SCH 4004·was only for PCB generation

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Nothing is impossible, there are only different degrees of difficulty.
For every stupid question there is at least one intelligent answer.
Don't guess - ask instead.
If you don't ask you won't know.
If your gonna construct something, make it·as simple as·possible yet as versatile as posible.


Sapieha

Post Edited (Sapieha) : 9/27/2008 1:00:37 AM GMT

Pasha

Thanks a lot I will let you know my progress

Sapieha

Hi Pasha.

Reread my post on PS.
If You will I can generate PCB print

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Nothing is impossible, there are only different degrees of difficulty.
For every stupid question there is at least one intelligent answer.
Don't guess - ask instead.
If you don't ask you won't know.
If your gonna construct something, make it·as simple as·possible yet as versatile as posible.


Sapieha

Paul Baker

Hi Pasha,

Please start only 1 thread per question, You have another thread with the same title. Since the content in that thread is stated differently, I am reprinting it here and deleting the other thread.

Pasha said...
Hello I have only recently purchaced a propRPM for the purpose of controlling a robot i am building. I was thinking of controlling the two 12V drill motors with the L298 using PWM. I found the L298 driver on the obex and was really happy, but it only tells me what pins to connect from the Propeller to the L298. It also comes with a PDF about what each pin does. I looked up how to connect the L298 to a PIC on the internet(since i couldn't find one for the Propeller). I connected it up like it said to for the pic, except i put the datalines to the propeller like the driver said to do. When i connected it up, it didn't do anything at all. the chip didn't get warm or anything. I thought it might be that the voltage from the propeller was to low or something, but i didn't know what to do so i was wondering if someone could post a chematic of how they did it or even just a picture. Thanks

Take care,

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Paul Baker
Propeller Applications Engineer

Parallax, Inc.

Pasha

sorry about that I tried to post, then it went blank instead of going to the forum, so i thought it had just deleted it or something, so i started again thanks.

Pasha

I think that this will be enough for me, since i am going to build it on a circut board, and am not going to print the PCB thanks though Sepieha.

Pasha

Sapieha could you tell me what the junction pins connect to?

Sapieha

Hi Pasha.

I have updated first post

Ps.
RS1-R2-R3-R4 = RS5-R6-R7-R8 = 0.5 W
D1 to D8 = 1-2 A Fast diodes (1N5818 Diodes 1A) { VF £ 1.2 V @ I = 2 A

trr £ 200 ns

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Nothing is impossible, there are only different degrees of difficulty.
For every stupid question there is at least one intelligent answer.
Don't guess - ask instead.
If you don't ask you won't know.
If your gonna construct something, make it·as simple as·possible yet as versatile as posible.


Sapieha

Post Edited (Sapieha) : 9/27/2008 1:38:08 AM GMT

Pasha

Thanks for the details i have got it working with motor, but the motor was drawing more than i had expected so i will have to buy a second chip, and run each side in parallell, i will keep you updated, thanx again.

Pasha

Hello again, this is Pasha. I had put aside my robot project for some others for a while, and am just coming back to it. Could some one send me a printable plan for a double sided board to controll two 4A motors using l298's. I have had some experience with toner transfer, and am planning to build it that way. Tnkx

Toby Seckshund

I use toner transfer too and usually use FreePCB to do the layouts, although you have to use Pentalogics Gerber printout. EAGLE and Dip Trace do free demo versions for small boards. I have got too used to FreePCB and never persivered with EAGLE which allows angular placement of the parts, as does Dip Trace.

Simple boards like your request would be ideal practice.

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Style and grace : Nil point