How to Use a Servo with Tessel

Tessel is a microcontroller you program in JavaScript. It's like Arduino, but designed to be easier to use and web-friendly.

Here's what you need:

  • Tessel
  • Servo module
  • Servo motor (one comes with the servo module, but there's room for 16 of them on there.)

    Step 1: Install Tessel

    How to Use a Servo with Tessel

    If you haven't used a Tessel before, you should go install it.

    Step 2: Plug in the servo to the module

    How to Use a Servo with Tessel

    Plug servo into port "1" on the module as shown.

  • the brown wire (ground) goes to -
  • the red wire (power) goes to +
  • the yellow wire (signal) goes to S

    Step 3: Power the module

    How to Use a Servo with Tessel

    Plug 5V adapter into the barrel jack on the servo module, then plug into wall power.

    Step 4: Plug the module into Tessel

    How to Use a Servo with Tessel

    It's best to unplug Tessel from power while plugging in modules.

    Plug the servo module into Tessel port A with the hexagon/icon side down and the electrical components on the top, then plug Tessel into your computer via USB.

    Step 5: Install the servo module

    How to Use a Servo with Tessel

    Install by typing `npm install servo-pca9685` into the command line.

    Step 6: Save the code

    How to Use a Servo with Tessel

    Save this code in a text file called servo.js:

    // Any copyright is dedicated to the Public Domain. //********************************************* This servo module demo turns the servo around 1/10 of its full rotation every 500ms, then resets it after 10 turns, reading out position to the console at each movement. *********************************************/var tessel = require('tessel'); var servolib = require('servo-pca9685');var servo = servolib.use(tessel.port['A']);var servo1 = 1; // We have a servo plugged in at position 1servo.on('ready', function () { var position = 0; // Target position of the servo between 0 (min) and 1 (max). // Set the minimum and maximum duty cycle for servo 1. // If the servo doesn't move to its full extent or stalls out // and gets hot, try tuning these values (0.05 and 0.12). // Moving them towards each other = less movement range // Moving them apart = more range, more likely to stall and burn out servo.configure(servo1, 0.05, 0.12, function () { setInterval(function () { console.log('Position (in range 0-1):', position); // Set servo #1 to position pos. servo.move(servo1, position); // Increment by 10% (~18 deg for a normal servo) position += 0.1; if (position > 1) { position = 0; // Reset servo position } }, 500); // Every 500 milliseconds }); });

    Step 7: Play!

    How to Use a Servo with Tessel

    In your command line, `tessel run servo.js`

    Watch your servo move!


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