I would use a microcontroller, for instance Atmel ATtiny ( [1]8 pin version) to replace the relays needed to keep track of 4 states, and an [2]L293 dual H-bridge motor driver to drive the two motors in forward and reverse directions. You would need 4 pins to control the two motors in two directions each, and 1 pin for the momentary contact switch. If you wanted two separate momentary contact switches, one start, the other to return, that would take all 6 I/O pins of the 8 pin chip. Or you could get a larger, 20 pin Attiny, or PIC from Microchip, or an Arduino or PickAxe or Basic Stamp to use for the controller. Mike
This is a dumb question but I'm having a mental block. I have a 12 volt dc motor that I want to run from the push of a momentary pushbutton which will run until a limit switch gets hit. Digikey has a power latching relay PB1088-ND (cheap) that I can't tell if it actually latches once energized. (I attached the relay document) Is relays and switches even the best/cheapest solution? Suggestions? Power: quantity of 2 12 volt batteries available Input: momenary 12 volt pushbutton #1 Requirements: 12 volt dc motor #1 12 volt dc motor #2 The application: Stage 1: momentary signal from pushbutton #1 starts motor #1 that runs until a limit switch is hit triggering stage 2 Stage 2: motor #2 runs until another limit switch is hit and remains stable Stage 3: momentary signal from pushbutton #1 reverses the polarity of power to the motor #2 running it until back to it's start position and triggering stage 4 Stage 4: reverse of the ploarity of the power to motor #1 running it until it is back to the start position Thanks for any suggestions if non I'll just wing it. -- Burn the Land, Boil the Sea, You can't take the SKY from me! References 1. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=ATTINY13A-PU-ND 2. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=497-1389-5-ND
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