hi everyone!
i'm trying build gps-controlled speedo, , i'm using arduino it. i've got gps reading , decoding working ... i'm having difficulty actual display.
the speedo going rebuild of classic truck, , father-in-law (who doing it) wants speedo authentic - digital display out!
instead, i've found dashboard rover, , have extracted motors move speedo , rev-counter needles, intention of driving them arduino.
i've attached picture of 1 of motors. hoping able me identify it. i'd assumed bipolar stepper motor, after wiring arduino sn754410 h-bridge i'm confused. there no serial numbers on motor, have nothing google for.
i'd assumed bipolar motor, because of 4 connections. after experimentation, i've noticed needs 2 of connections in order move. started stepper_onerotation example.
it behaves this:
1. during delay() part of program, needle settles 1/3rd through range.
2. when mystepper.step() called, needle tends drop bit. doesn't seem matter whether in clockwise or anticlockwise part of program.
3. delay ... returns 1/3rd position.
i'd wondered if might want simple analogue voltage across (like vu meter) ... on wiring directly lab power-supply, i've found doesn't seem move proportionally voltage increase. rises in first couple of volts, makes little progress afterwards.
has come across 1 of these before?
i'm trying build gps-controlled speedo, , i'm using arduino it. i've got gps reading , decoding working ... i'm having difficulty actual display.
the speedo going rebuild of classic truck, , father-in-law (who doing it) wants speedo authentic - digital display out!
instead, i've found dashboard rover, , have extracted motors move speedo , rev-counter needles, intention of driving them arduino.
i've attached picture of 1 of motors. hoping able me identify it. i'd assumed bipolar stepper motor, after wiring arduino sn754410 h-bridge i'm confused. there no serial numbers on motor, have nothing google for.
i'd assumed bipolar motor, because of 4 connections. after experimentation, i've noticed needs 2 of connections in order move. started stepper_onerotation example.
it behaves this:
1. during delay() part of program, needle settles 1/3rd through range.
2. when mystepper.step() called, needle tends drop bit. doesn't seem matter whether in clockwise or anticlockwise part of program.
3. delay ... returns 1/3rd position.
i'd wondered if might want simple analogue voltage across (like vu meter) ... on wiring directly lab power-supply, i've found doesn't seem move proportionally voltage increase. rises in first couple of volts, makes little progress afterwards.
has come across 1 of these before?
i suppose call stepper motor it's 1 step per revolution.
take @ mc33977 "gauge driver" , signals sends motor. might able replicate 4 pins on arduino.
take @ mc33977 "gauge driver" , signals sends motor. might able replicate 4 pins on arduino.
Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > Identifying (and hopefully controlling) a motor used in a car dashboard
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