Gab_S
5 years ago
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= Project i wanna die plis |
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== Project Description |
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This was but a sad attempt at making a "budget" [Slam] |
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(Simultaneous localization and mapping) robot-vehicle, with a time of flight |
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Lazer sensor.It uses the esp32 as it's brains (tons of io pins, 2 core, wifi & |
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bluetooth on chip,low consumption,etc.) and a arduino nano that acts as a slave |
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controling the drive tracks by taking commands from the esp32. |
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== Working principal |
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The working principal behind the robot is based on dead reckoning meaning we |
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create the map as we go assuming we've started from position 0,0.Using the tof |
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sensor we get measurments from all directions (360 degrees) this happens using |
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the stepper motor along with the hall effect sensors so we the degree of each |
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measurment great so now we can bind these values (distnace,angle) to the |
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robot's postion.The problem with our particular platform was space limitations |
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and the fact that the tracks are moved by dc motors some solutions on these |
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problems would be if possible driving the tracks by stepper motors directly or |
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otherwise so we know exactly how many steps each track has made therefore |
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deducing the robots position or using photo encoders in the small dc motors |
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producing the same effect.(problems with bad are also very real and can throw |
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off our measurments but hey we're not supposed to send this robot on mars ) |
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Being able to determine our traveled distance and having 360 "accurate" |
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measurments of the space traversed would enable us to construct an algorithm |
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which by using these data could find a way to traverse the space creating a |
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map along the way. |
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== Parts |
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- Esp32 |
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- Arduino Nano |
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- 28BYJ-48 Stepper |
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- ULN2003 Stepper Motor Driver |
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- I2C Logic Level Converter |
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- VL53L1X |
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- Hall Sensor |
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- Slip ring |
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- 2x18650 Batteries |
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- Battery Protection Board |
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- Toy truck |
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- L298N Motor Driver |
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image:./pics/esp32.jpg[200,200] |
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image:./pics/nano.jpg[200,200] |
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image:./pics/stepper&driver.jpg[200,200] |
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image:./pics/logic_level.jpg[200,200] |
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image:./pics/sensor.jpg[200,200] |
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image:./pics/hall.jpg[200,200] |
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image:./pics/slipdisc.png[200,200] |
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image:./pics/bat.jpeg[200,200] |
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image:./pics/bms.jpg[200,200] |
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image:./pics/truck.png[200,200] |
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image:./pics/L298N.jpg[200,200] |
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image:./pics/diagram.png[1000,1000] |
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== Difficulties & things to consider |
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- Acquiring location position in a room |
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- Getting accurate data from budget sensors with low resolution |
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- Calculating travel distance based on Dc motors |
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- Maintaning electrical connections between the two rotating parts |
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== Problems that managed to get solved |
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=== - Getting angle of measurment |
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Solution: Using a Hall sensor and a magnet to find 0 degree spot & using a |
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stepper motor with known gear ratio so we know the step angle |
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=== - Power consumption |
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Solution: Used 2xcells 18650 batteries because simple alkaline batteries |
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wheren't up to the task |
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=== helpful links: |
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link:https://www.youtube.com/watch?v=fQ2iB7qkrUg[youtube homemade lidar] |
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