Control with a 5v relay. This was a bitch to troubleshoot. Just wouldn’t work. Checked and double checked circuit. Coil voltage was switching correctly but load was not switching. Thought I had a fault relay...
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Figured out how to test the relay directly with a power supply and a multimeter... it was working fine. Turned out the pins are just kinda the wrong spacing and length and it just wasn't sitting correctly in the breadboard, and I had to really push it down with my thumb.
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With this, I have officially completed the Elegoo Mega2560 tutorial manual, even though it only introduced me to like half the components in the kit. Haven't used : capacitors, ultrasonic sensor, led panel, motor controller, stepper... gonna have to go hunting for sketches.
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We move into the wild lands beyond the manual by figuring out servo motor control... which lies about 0 and 180 degrees... I’ll have to dig into this mysterious servo.h library.
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And finally a stepper control via a breakout board that made it trivial.
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Both these were fairly trivial. The hard one was DC motor control with a relay.
On to speed and position control in next session.
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Status: I’ve learned to use the following things from the kit. 31 of 54 components. Gonna have to design my own learning experiments for all the others.
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Spent an hour looking up what seem to be really finicky beaglebone blue JST-SH and ZH connectors. Why couldn’t they use more standard ones?
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Trying to use this single-board robotics-specific computer to simplify my life, but realizing there are downsides now. None of these headers are the usual sizes. Anyone used this BBBlue board for a project?
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It’s really frustrating when a datasheet calls out “JST connectors,” since that hardly narrows it down. pro tip: you can buy a bunch of pre crimped wires and blank connectors on digikey and then chop them up to build what you want.
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