Remote two wire positioner - A simple and inexpensive way to remotely rotate a display or object is with a positioner that uses a stepper motor to rotate it. The motor is driven by a circuit mounted near the motor and by a control circuit at a remote location. __ Golab.com
Reversing H-bridge - This H-bridge variant was one of the first in which the reversing circuitry is built into the driver, rather than (as is more-commonly done) into the control circuitry upstream of the driver. This is a handy circuit, though, for 2-motor walkers -as all that is required to reverse one is to reverse the phasing of one of the motors. __ Designed by Wilf Rigter
Reversing H-Bridge for Small Motors - Here's a simple switch circuit for reversing and stopping a motor without any control of speed. __ Designed by Richard Torrens
RF Wireless PWM DC Motor Speed control - The wireless PWM DC motor transmitter circuit consists of WZ-X01 RF module, Holtek HT-640 encoder and 8-bit A/D converter. U1 ADC0804 converts the analog voltage to digital data; U2 encodes that data (D0~D6) along with D6, D7 and transmitting through the RF transmitter module. The potentiometer VR1 varies the voltage to the A/D U1 pin6, __ Contact: info @ wzmicro.com
Rolling Shutter Motor Control - An electrically operated rolling shutter usually has a standard control panel with a three-position switch: up, down and stop. If you would like to automate the opening and closing with a time controlled switch, a few additional wires will have to be connected. Typically, the controls are implemented as indicated in the schematic ‘Normal Situation’.
Room temperature controller - On this page, I will introduce the room temperature controller with PIC. This equipment uses two temperature sensors, drives external equipment, and keeps the temperature of the room at preset temperature. The purpose of this equipment is for preventing room temperature going up with the heat of the computers. Electric cost will become high if an air-conditioner is always operated. Then, I made the equipment __ Designed by Seiichi Inoue
Rotary Controller Positions Stepping Motor - EDN-Design Ideas - 08/03/95 The circuit in Fig 1 uses a servo potentiometer, as opposed to a rotary switch or encoder, to provide the necessary drive pulses for a stepping motor. This motor positions a pointer by the rotation of a manual control. The circuit must be precise, allow a rapid response, and be simple to use. (This circuit was part of a complex apparatus used for a series of physiological tests.) Another requirement is that the control had to be a small, handheld, battery-operated device. __ Circuit Design by TG Barnett and ME Rosenberg, Department of Physiology, Queen Mary and Westfield College, London, UK
RS-485 for Digital Motor Control Applications - Small electromechanical drives include solenoid drives, single direction DC, bi-directional DC, or brushless DC systems and are typically sized according to their frame size and power in watts. Digital controllers, software, and complimentary analog and digital solutions from TI can help solve most drive requirements. __ Designed by Texas Instruments App Notes, 12-May-03