Alex Glow
Published © GPL3+

Thr33p10 – Third Hand Telepresence Bot

Building a smart little assistant to help with my videos!

IntermediateWork in progress3 hours1,753
Thr33p10 – Third Hand Telepresence Bot

Things used in this project

Hardware components

MATRIX Creator
MATRIX Labs MATRIX Creator
×1
Raspberry Pi 4 Model B
Raspberry Pi 4 Model B
×1
Servo Module (Generic)
×2
Third hand (generic)
×1

Story

Read more

Custom parts and enclosures

Servo wrist

Servo-to-third-hand joiner

Ring holder

Screw-adjustable holder for MATRIX Creator (with third-hand attachment)

Code

servotest.js

JavaScript
Run the servos with MATRIX Lite! Save this into your lite-js folder, then run "node servotest.js" and watch it go! (You can also substitute in other values, to test the limits of your servos.)
const matrix = require("@matrix-io/matrix-lite");

matrix.gpio.setFunction(0, "PWM");
matrix.gpio.setFunction(1, "PWM");

matrix.gpio.setMode(0, "output");
matrix.gpio.setMode(1, "output");

matrix.gpio.setServoAngle({
  pin: 0,
  angle: 90,
  min_pulse_ms: 0.8
});

matrix.gpio.setServoAngle({
  pin: 1,
  angle: 90,
  min_pulse_ms: 0.8
});

NFC-secured telepresence (MATRIX)

JavaScript
Launches the letsrobot.tv script, and shows rainbow lights, if the correct NFC token is presented.
const matrix = require("@matrix-io/matrix-lite");
const shell = require('shelljs')
const nfc = require("@matrix-io/matrix-lite-nfc");

var mode = 0;
everLoop();

nfc.read.start({rate:100, info:true}, (code, tag)=>{
    if (code === 256){
        console.log("Tag Was Scanned");
        console.log(tag);
        console.log(tag.info.UID);
        if (tag.info.UID === "LAUNCH-KEY"){
            shell.exec('/home/pi/start_robot');
            mode = 1;
        }
        if (tag.info.UID === "KILL-KEY"){
            shell.exec('~/runmyrobot/scripts/kill_command');
            mode = 0;
        }
    }

    else if (code === 1024)
        console.log("Nothing Was Scanned");
});

/* here beginneth the everloop function */

function everLoop() {
let everloop = new Array(matrix.led.length);

let ledAdjust = 0.0;
if (everloop.length == 35) {
    ledAdjust = 0.51; // MATRIX Creator
} else {
    ledAdjust = 1.01; // MATRIX Voice
}

let frequency = 0.375;
let counter = 0.0;
let tick = everloop.length - 1;

setInterval(()=>{
    if (mode === 1){
    // Create rainbow
    for(i = 0; i < everloop.length; i++) {
        let led = {};

        led.r = Math.round(Math.max(0, (Math.sin(frequency*counter+(Math.PI/180*240))*155+100)/10));
        led.g = Math.round(Math.max(0, (Math.sin(frequency*counter+(Math.PI/180*120))*155+100)/10));
        led.b = Math.round(Math.max(0, (Math.sin(frequency*counter)*155+100)/10));
        

        counter += ledAdjust;

        everloop[i] = led;
    };

    // Slowly show rainbow
    if (tick != 0) {
        for (i = tick; i > 0; i--) {
            everloop[i] = {};
        }
        tick--;
    }

    matrix.led.set(everloop);

    }
    else {
        matrix.led.set("black");
    }

},200);
}

Credits

Alex Glow

Alex Glow

98 projects • 978 followers
The Hackster team's resident Hardware Nerd. I like robots, music, EEG, wearables, and languages. FIRST Robotics kid.

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