If your arm is geared-the motor is turning at speed X and through gears makes the arm move at speed Y-be sure to install the potentiometer on the shaft that stays within that 250º arc. That’s why you have to include this sensor at the start of your design process. And maybe you have a tight spot, in which it will never fit. It’s difficult to slap one of these on after the fact doing so usually involves taking the arm joint apart and changing all of your spacers, etc. This sensor, along with the optical shaft encoders (subject of my next post) require some advance planning in your robot design. Then when the arm lifts, its axle turns that inner white portion of the sensor to produce a reading. Wrong! You screw this thing onto a part of your robot that does not move. My brain wanted to screw this thing onto the movement arm itself. The small white inner part of the sensor is square and can rotate (hard to see until you’re holding one) the big red part is screwed onto the robot. The hole in the middle of the sensor is square, and you run the arm’s shaft through it. Renegade Robotics Starstruck robot potentiometer can be seen in upper right corner, at the top of the forklift arm Why? Because this sensor can only turn about 250º. It is used on a component that has a rather small arc of motion, like a lifting arm.
This sensor is not for a chassis or other spinning motor. This one, however, is not digital but rather analog-returning values from 0 to 4095 (RobotC) or 0 to 1023 (eas圜). Along with the 2 sensors mentioned in my previous post (bump switch and limit switch), this is one of VEX’s most reliable sensors, and it’s pretty durable to boot.
Robotc light sensor series#
The aim of this series is to help teams that are new to using sensors have an idea of what is available and what they might like to use on their own robots.Īnd since this post has gotten kinda lengthy, here’s your Potentiometer Table o’ Contents: (a) installation, (b) mark your sensors before using, (c) test, test, test, (d) OMG I broke it, (e) how does it work? (f) uses. *!!Code automatically generated by 'ROBOTC' configuration wizard !!*//Ĭase BLACKCOLOR: sColor = "Black" break Ĭase GREENCOLOR: sColor = "Green" break Ĭase YELLOWCOLOR: sColor = "Yellow" break Ĭase WHITECOLOR: sColor = "White" break Īs you can see, not a whole lot to it.This is the second of a series of posts that examines each VEX sensor in turn. #pragma config(Sensor, S1, colorPort, sensorCOLORFULL) Please note that this is basically a stripped down version of the one shipped with ROBOTC I just removed all of the diagnostics crud that the developers added so they could debug their drivers. Here’s a very simple program that will display the currently detected colour on the screen. The NXT 2.0 Colour Sensor is super easy to use.
Don’t let that word scare you off, I’ve been using it for months now and it’s never failed me. Don’t worry, though, it’s a very stable beta. In order to use the NXT 2.0 colour sensor you’ll need to make sure of one thing: you absolutely need at least ROBOTC 2.26.1 for NXT, anything less simply won’t work.
Robotc light sensor code#
“300 lines of code to read a simple colour?” you ask yourself.įear not, it’s a lot easier than that. You browse through the example programs that are shipped with ROBOTC and open the “ColorSensor.c” program. So you just bought yourself one of the NXT 2.0 Colour Sensors and you’re keen to get started with it.
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