April 1998, by Jim Brown
August 2002, page format revised, links update by NCC
July 2004, additional graphics provided by Bob Jordan
Project Summary
The goal of this project is to create a carrier board for an L298 H-Bridge with 1000mf cap, 12 diodes, a terminal block for power and two motors, and a header for interfacing with a microcontroller. The board is based on a simple L298 H-Bridge design by Clay Timmons.
Note that the board can be made using just the bottom artwork. The top artwork is informational only and contains text explaining diode orientation and pinouts.
Color image of v1.0 PCB artwork
Flipped v1.0 PCB artwork
Component placement
Schematic Diagram
MOTOR & POWER HEADER TO CPU HEADER
+--------+
Motor power+ -+-+-+-+-+----------| |----------- in 1
| | | | | 1000mf | L298 |----------- in 2
_ _ _ _ +--|(---+ | |----------- enable a
^ ^ ^ ^ | | |----------- in 3
Gnd * -----|-|-|-|-+-+-+-+-+--| |----------- in 4
| | | | | | | | | |----------- enable b
| | | | v v v v | |----------- curr sense a
| | | | - - - - | |----------- curr sense b
| | | | | | | | | |
Motor 1 ---+-+-|-|-|-+-|-|-|----| |-----+----- +5
+)(+ | | | | | | | | +)(+
+------+-|-|---+-|-|----| |--------+-- Gnd *
| | | | | |
Motor 2 ---+-----+-|-----+-|----| |
+)(+ | | | |
+----------+-------+----| |
+--------+
* Grounds are connected.
You use in1 & in2 for direction and enablea for pwm for motor 1
You use in3 & in4 for direction and enableb for pwm for motor 2
The Details
L298 PCB Artwork – PDF format
For more information, see the DPRG tutorial entitled, H-Bridge Theory of Operation.