My first robot
Hi!
I'm building my first robot with the propeller chip, but I've only got access to a couple of 6v DC motors, which obviously won't run on just the voltage of a high pin-out.
I've been trying to boost my voltage with a couple of transistors and an outside voltage source to get my motors running. However, I've burned a few transistors on my way.
I'm wondering if someone can help me with a circuit to boost my pin-out voltage to the 6v i need, using 2 transistors per motor (Got the motors running, but only for a short while).
The transistor type I've got is C945P NPN, and there is no time to order new ones.
I'm building my first robot with the propeller chip, but I've only got access to a couple of 6v DC motors, which obviously won't run on just the voltage of a high pin-out.
I've been trying to boost my voltage with a couple of transistors and an outside voltage source to get my motors running. However, I've burned a few transistors on my way.
I'm wondering if someone can help me with a circuit to boost my pin-out voltage to the 6v i need, using 2 transistors per motor (Got the motors running, but only for a short while).
The transistor type I've got is C945P NPN, and there is no time to order new ones.
Comments
of sending pulses to the motors or a specific length.
That gives the greater control that is needed for many robotics applications.
I hope that this helps, I know you want to use the current motors that you have but maybe at some point,
a change of motors would be helpful?
Anyway good luck with your first robot. I am thinking about building my first propeller based robot so I will follow
your posts because many of the same questions will be ask by both of us.
Here are the ones that I have had pretty good luck with, them and the tank treads make for a pretty spiffy looking]
robot, but what I found out was that after just a short while the 2K memory capacity of the basic stamp was just not
enough, so now I am in the market for my second stamp, and looking real hard at the spin stamp.
Here is a link to some motors that run pretty well with my last set up.
www.parallax.com/Store/Accessories/MotorServos/tabid/163/CategoryID/57/List/0/Level/a/ProductID/102/Default.aspx?SortField=ProductName%2cProductName
Go to the main Parallax webpage and click on the Resources tab. You'll see a link to Nuts and Volts Columns. Click on that and you'll get to the Nuts and Volts Columns index. Download and read Column #6. This has a variety of suggestions for controlling motors with a Stamp. The same circuits and ideas work for the Propeller as well. The main difference is that you need a smaller base resistor for any transistor. Use Ohms Law (Voltage = Current x Resistance). Usually the current for a Propeller output would be 0.01A to 0.02A and the voltage would be about 2.7V (3.3V - 0.6V for the base-emitter diode) or somewhere between 150 Ohms to 270 Ohms. You absolutely need the diode across the motor as shown on the last page of the column.
Thank you, that document got me going by just flushing through the text.