More than anything from "hacking" that broken Roomba. And where'd that go?
Roomba, LM339, ESC, 1000 miles at sea in the Atlantic Ocean, dual or quad, catsup or ketchup... all this "stuff".
Cripes.
PJ Allen,
Hey I got alot of parts from that roomba and a good platform to maybe do something with. You are right though, if I want to meet my goals it might be in my best interest to buy "kits" instead of parts and if I have time learn from the kits instead of throwing things together and go hmm why didn't anything happen.
I was working with a ESC that I purchased from Tower Hobbies It was just a forward controller but one thing that I discovered is that the servo plug that you supply the signal to control the ESC back feeds the positive (red) lead from the batteries used to power the motors. I disconnected the red wire from the plug and just used the signal and ground to control my ESC.
Yea, I figured that was happening with the ESC I had. I believe it has to do with the BEC that a lot of ESCs have. This is one reason I am trying to redesign one so besides supplying positive power through the line it will be receiving positive power through the BOE and should eliminate the need for two batteries or a y adapter split between the BOE and the ESC.
Here are the specs for the 540 motor that I am using:
• Voltage Range: 12.0V
• Normal Voltage: 7.20V
• Normal Load: 19.6mN.m (200g.cm)
• Speed at No Load: 15,800 RPM
• At normal load speed: 14,000 RPM
• At normal load current 6.0A
Unfortunately, the L298 Compact Motor Driver will not be able to handle the amps the motor will be throwing at it. I have some IRF620 that can handle 6.0A a piece so I guess I will be using them. I can't use 4 of them in the H-bridge can I? I have to use two IRF620 and its counterpart? Does anybody know which that is? Thanks.
Comments
PJ Allen,
Hey I got alot of parts from that roomba and a good platform to maybe do something with. You are right though, if I want to meet my goals it might be in my best interest to buy "kits" instead of parts and if I have time learn from the kits instead of throwing things together and go hmm why didn't anything happen.
Matt
I was working with a ESC that I purchased from Tower Hobbies It was just a forward controller but one thing that I discovered is that the servo plug that you supply the signal to control the ESC back feeds the positive (red) lead from the batteries used to power the motors. I disconnected the red wire from the plug and just used the signal and ground to control my ESC.
Hope you find this helpfull
Mike W
Yea, I figured that was happening with the ESC I had. I believe it has to do with the BEC that a lot of ESCs have. This is one reason I am trying to redesign one so besides supplying positive power through the line it will be receiving positive power through the BOE and should eliminate the need for two batteries or a y adapter split between the BOE and the ESC.
Matt
Here are the specs for the 540 motor that I am using:
• Voltage Range: 12.0V
• Normal Voltage: 7.20V
• Normal Load: 19.6mN.m (200g.cm)
• Speed at No Load: 15,800 RPM
• At normal load speed: 14,000 RPM
• At normal load current 6.0A
Unfortunately, the L298 Compact Motor Driver will not be able to handle the amps the motor will be throwing at it. I have some IRF620 that can handle 6.0A a piece so I guess I will be using them. I can't use 4 of them in the H-bridge can I? I have to use two IRF620 and its counterpart? Does anybody know which that is? Thanks.
Regards,
Matt