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I want to design a fixed robotic arm when can press a "push button" for a specific duration. The arm needs to be controlled from a PC. The push button in portable and can be placed flat on the ground near the arm.
Hi...If I were You, I'd use microcontroller to get data via USART (USB or Serial) from PC and then actuate servo. This way, You need 1x microcontroller, 1x low power servo (preferably lower power that what USB can supply, then everything can be driven from USB port) and 1x USB to TTL chip (if You desire everything to be handled via USB). You will need to write simple software for microcontroller (if it's Atmel uC, then AVRstudio will be OK) and another piece of software for Your PC.
Instead of using a microcontroller and 1x USB to TTL chip, I was thinking of using a Servo Controller with USB & TTL Interface....something like http://probots.co.in/index.php?main_page=product_info&cPath=55_56&products_id=395
1. Can you please suggest a servo which can operate from the USB? If this is not possible can you please point out what options do I have to power the servo ?
2. Will HS-311 give me enough torque to cause the "push" on the button ? I know this one is tricky to answer since it depends on how tough is the button to push. But to give you an idea the button would be similar to the one you see on a scientific calculator.