From rathborey at gmail.com Sun Sep 11 12:44:50 2005 From: rathborey at gmail.com (Vatana An) Date: Sun Sep 11 21:57:34 2005 Subject: [WheelWatcher] feeding clock signal of wheel watcher into a pid controller as voltage signal Message-ID: Hello Pete, I have a need to use a pid controller so both of my wheels can be controlled to move at the desired speed. My input voltage will be the voltage that I feed into the servo motor (which has been modify to be a dc motor). The wheel watcher will generate a clock signal to see how fast the wheel is moving and output it to the oopic-r as clock signal. My question is that how can I convert the clock signal coming out of the wheel watching into a voltage signal so that I can feed it into my pid controller? Do I need any extra hardware? If so do you have such hardware available for sale? Thank, -- Vatana An From plskeggs at noeticdesign.com Sun Sep 11 22:04:54 2005 From: plskeggs at noeticdesign.com (Pete Skeggs) Date: Sun Sep 11 22:05:00 2005 Subject: [WheelWatcher] feeding clock signal of wheel watcher into a pid controller as voltage signal In-Reply-To: References: Message-ID: <43250C76.9050607@noeticdesign.com> Vatana An wrote: > Hello Pete, > I have a need to use a pid controller so both of my wheels can be > controlled to move at the desired speed. My input voltage will be the > voltage that I feed into the servo motor (which has been modify to be a dc > motor). The wheel watcher will generate a clock signal to see how fast the > wheel is moving and output it to the oopic-r as clock signal. My question is > that how can I convert the clock signal coming out of the wheel watching > into a voltage signal so that I can feed it into my pid controller? Hello, Vatana, Please help me understand your question better. Do you already have a PID controller? If so, is this something you designed yourself, or something you bought? Most PID controllers you can buy have encoder inputs. The ChA and ChB outputs from the WheelWatchers would connect there. > Do I need any extra hardware? If so do you have such hardware available for sale? We are currently beta testing a new product, the WheelCommander, which is listed on our website: http://www.nubotics.com You could use that, together with two H-bridges to drive your motors. The WheelCommander is a kind of PID controller, which controls each wheel as well as the difference in speed and position of the wheels, to keep a robot driving straight. We hope to be selling the WheelCommander in 1 or 2 months. Please let me know if you have any more questions. Sincerely, Pete Skeggs Nubotics Technical Support