robotdude
Canada
Asked
— Edited
I'm trying to build a mid-size robot using the Thumper 4wd and two 2.5 Amp motor controllers and 12v/12Amp battery to run it but I don't have torque to turn it around (only to go forward/backwards). Actually I can easily stop the wheels with my hands. However if I will connect the motor directly to the battery I can't stop it from turning. So my guess is that the 2.5 amp is not enough or something is wrong. There is any quick fix for that on the 2.5 amp controller or should I get a new motor controller? Or. I'm pushing the unit to the limits Help..
I've never seen that controller before. For less price, the Sabertooth comes with heatsinks - where that does not. It doesn't look like a controller that I would recommend. But, it sounds like you already have it in your posession.
So i'll try and help you.
It looks like the device uses a BAUD of 9600.
You will connect RX to a digital pin on EZ-B. You will connect GND to a GND pin on the EZ-B.
Power comes from your battery maybe? Through Vin
Use this example project... EZScript-Examples-PololuQikMotorDriver.EZB
I don't know if that exactly will work perfectly out of the box, but it's an example i put together from their arduino sketch. The number 127 in each SendSerial() is the speed. It can be a number between 0 and 127
You can technically use a variable for the speed, and adjust it.
How much does that robot weigh?
Thanks DJ But now I have a new problem .. the ezb controller is dead. I can turn it on and connect to it, and everything looks alright but. I cannot do anything with it. I'm not sure if it's something in the EZB firmware or failure of one of the components. I checked the fuse, run the EZB diagnostics and checked all the connections, but still no power to any of the servos.
The robot weight around 7-8 kg It's mostly made out of foam so it's very light for his size.
Check the fuse on the ezb and do diagnostic test with a digital meter. I've done it myself.... Killed a ezb with static because I get over confident with handling the board and connections. Worse case you can replace the chip for a really low cost but let's take the other diagnostic steps first. The diagnostic video is under videos/ tutorials. - Josh Starnes
So the fuse and ezb diagnostic are all good but still so eink is wrong with my ezb. I can connect to it but I cannot do anything with it. No power to any of the servos or getting any signals back from the ultrasonic or infrared. What could it be?
Do you get a Bluetooth pair and connection with solid light?
Yes.. Usually when you connect a new servo to a good ezb the servo will move slightly but now it will not do anything.. So I suspect it's something with power or something like that