Robot Project 2021 Notes: Difference between revisions
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* 10-year-olds my ass. This required a hell of a lot of strength to snap the chassis together without snapping. | * 10-year-olds my ass. This required a hell of a lot of strength to snap the chassis together without snapping. | ||
* Don’t forget: there are '''eight''' snap points: Four at the corners and two above the wheels. I got the outer four, and didn’t notice the wheel ones until after the fact. It took forever to get those to snap into place. | * Don’t forget: there are '''eight''' snap points: Four at the corners and two above the wheels. I got the outer four, and didn’t notice the wheel ones until after the fact. It took forever to get those to snap into place. | ||
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== Wiring == | |||
* Motor wires ''may'' need to be flipped (black to red and vice versa). | |||
* '''IMPORTANT SAFETY TIP''': The instructions fail to mention that the battery pack should be rotated 90 degrees after slipping in the back so that the power cable is coming out the left side behind the wheel – or if the instructions did mention it, that tidbit wasn’t clear to me. | |||
* God help you if you ever have to replace the batteries… | |||
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== Powering on == | |||
* Providing power causes the <code>micro:bit</code> to boot with an introductory “H…E…L…L…O” and then prompts you to push buttons A and then B. | |||
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Revision as of 14:12, 9 February 2021
Sparkfun Red Hat Co.Lab Robot
(BBC micro:bit + Sparkfun moto:bit)
Sparkfun moto:bit Carrier Board
The moto:bit - micro:bit Carrier Board (Qwiic) uses a Qwiic interface? and offers pins for:
- six 3-pin sensors,
- two 3-pin servo motors
- two 2-pin “big” motors
and an I2C bus (as well as a Qwiic “port” and power switch)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ micro:bit CONNECTOR BUS ANALOG DIGITAL DIGITAL ONLY | | +-+----+-------+ +------+------+-+ | | | | | | SCL ☐ P0 • • P1 P2 • • P8 P12 • • P14 P15 • • P16 SDA ☐ 3V3 • • 3V3 3V3 • • 3V3 3V3 • • 3V3 VCC • • VCC 3V3 ☐ GND • • GND GND • • GND GND • • GND GND • • GND GND ☐ SENSOR SENSOR SENSOR SERVO I2C BUS BLACK • LEFT RIGHT • RED RED • MOTOR MOTOR • BLACK POWER IN INPUT RANGE VCC: 3 - 11V QWIIC STOP RUN MOTORS MOTORS
Wheel Motor Assembly
- Geez! They weren’t kidding! Getting the front motor mounts over the big motors was a PITA! Ultimately, brute forcing it with my hand rather than pliers proved the most successful.
- The rear motor mounts were only slightly better.
- Mounting the assemblage to the bottom chassis, I was sure I was going to snap something in two or tear out a wire.
- The motor I’ve mounted on the right side has a black wire whose solder point looks suspect…
Line folowing sensors
- The pins should be sticking out on the smooth side of the “bottom” mount.
- By contrast, this slipped together so easily that I worry it might be too loose, though it will undoubtedly tighten up when mounted to the chassis.
- This tutorial seems to be a thinly disguised advertisment for electrical tape…
Chassis
- 10-year-olds my ass. This required a hell of a lot of strength to snap the chassis together without snapping.
- Don’t forget: there are eight snap points: Four at the corners and two above the wheels. I got the outer four, and didn’t notice the wheel ones until after the fact. It took forever to get those to snap into place.
Wiring
- Motor wires may need to be flipped (black to red and vice versa).
- IMPORTANT SAFETY TIP: The instructions fail to mention that the battery pack should be rotated 90 degrees after slipping in the back so that the power cable is coming out the left side behind the wheel – or if the instructions did mention it, that tidbit wasn’t clear to me.
- God help you if you ever have to replace the batteries…
Powering on
- Providing power causes the
micro:bit
to boot with an introductory “H…E…L…L…O” and then prompts you to push buttons A and then B.