Using an L293D

lstrike

New Member
I am working on a miniature tank that uses a Tamiya Double Gearbox and an L293D motor driver chip.

After researching information on the parts I'm using and soldering them together, the circuitboard looks like this:

nomad circuitboard.png

However, when I try to test the motors by typing "high b.2", the motors don't respond at all. They still respond when I connect them to a 3V source.

The motors I'm using are 2 3V DC motors that came with the Double Gearbox. Any help on this would be appreciated.
 

SAborn

Senior Member
However, when I try to test the motors by typing "high b.2", the motors don't respond at all.
That is because you are only switching half of the H-bridge, you need to switch both halves together for each motor.
Example for motor 1 .......
high b.2
low b.3

Then to reverse motor 1 ...
high b.3
low b.2
 

Bill.b

Senior Member
You do not require the 3 diodes for the motor supply. The Tamiya Double Gearbox will run happily on 5v

You would require 0.001uf capacitors across the motors to minimise noise effecting the picaxe.

billsbot1circuit.jpg

Bill
 
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