Let's Make Robots!


Driving around, avoid obstacles and edges. Will have some more functionality but that's still to be determined.
Using a
UPDATE April 29, 2014: As for request of fello LMRians I've put those motors in the shopping section of Letsmakerobots: Micro Gear Motor UPDATE April 21 2014: Sadly … Read more

Maxhirez' PICAXE board

A week or so ago Max was trying to find a layout for a PICAXE 18 or 20 board with an L293/754410 motor driver. He was hoping for something similar to what sanc04 assembled.

L293 enable pin

Does anyone know any good reason to connect the enable pin to the microcontroller on the L293 motor driver?

Connecting this pin to 5V shouln't be enough?

This way I can use the microcontroller pin for any other use.



ESC + L293 + Brushless motor

So, i've been having some trouble lately and I can't seem to find a solution on the web. I've managed to controll a brushless motor through and ESC and arduino with PWM. Nothing too dificult. What I need now is a way to controll an inversion of the motor. Like you know, changing two of the wires from the motor makes it turn the other way around.

An ATmega328 and L293D based variable speed and direction motor controller
NTRODUCTIONThe GOduino II is a self-contained Read more

Problems with axe 08m and l293n


I have a teeny problem - I'm playing with stepper motors for my next robot, the plan is to have an 18M2 sending serial packets to a pair of 08M2s which each will control one stepper, to save outputs on the 18.

My problem is this, when I have the 18 running into the L293 driver the motor runs perfectly, but when I use an 08 nothing happens and it gets hot (I fear the magic smoke)...

Update 1:   Its been almost a year since I post v1 of my robot. Wow! After being lost in RC world of airplanes, quadcopters and helis for a year I … Read more

H-bridge braking with L293(D)

I discovered how much braking power a Solarbotics GM9 can have when you short the terminals. I need that stopping power to make a robot that is suspended from a wire, wound around a spool, powered by a GM9.

But I also need to be able to power the motor in either direction. My platform of choice is the Picaxe 28 project board with a L293D motor driver chip.

How do I tell the L293 to short the terminals of the motor? I tried
high 4 high 5 ' both inputs high
low 4 low 5  ' both inputs low
but my motor will not brake.

Navigate arround using 2 IR Leds and an IR receptor
Using a
This is PJBot version 3. The brain of this Bug is an Arduino. Now, it only go rolling and  avoiding obstacles that it detects with 2 led's and 1 IR receptor. Read more
This is a "one day" project- simple robot with two whiskers, who can avoid obstacles. This one is built around motor driver IC L293D, and some transistors and … Read more

Motor driver tested

Today I tested that the motor driver circuit of PICAXE Pete does in fact work. I'm now in the process of writing some code for line following using my standard technique: find out where the line is by taking the mean value of a histogram of the sensor values and using this to calculate a regulation term for each of the two motors.