Let's Make It (Audio Only) - Tech-zen.tv

This week we make a simple VU meter using an Arduino. We take audio input from either a microphone or a line level input and use a small transistor to amplify the signal, add some leds and some basic code to create a VU meter that has a switchable peak meter.

This week we take a look at using a shift register to control a single 7 Segment Display then we take a look at the Maxim 7219 chip that is designed specifically for controlling up to 8 7 Segment displays or an 8x8 LED matrix. Plus you can connect these chips serially like a shift register to add control of an additional 8 displays for each additional chip.

This week Bob is back and talk about how to control one and many relays with an Arduino. Also, an update on the live light project.

This week we attach a joystick control to an Arduino to control a pair of servos. It is much simpler than you think!

This week mike takes a look at some viewer requests. One a complete failure and the other may be working, but if it is working it is weird.

This week we expand on shift registers from last week and add another chip to demonstrate how you can daisy chain them to control more things with the same 3 pins off of the Arduino. Oh, did I mention that I have a special guest on the show tonight? Watch and Meet Bob.

This week we attach a shift register to an Arduino to demonstrate how to use a shift register to multiply the number of outputs that you can have on an Arduino. This is our first week on using shift registers and we go over the basics of sending the serial data to the shift register from the Arduino.

This week we finally are taking a closer look at the Raspberry Pi, show you where to get Raspian Wheezy, how to load it onto the SD card. Then we do some basic control of an LED with the built in GPIO port by making it blink by writing a script in python to blink the LED. Then, for our final demonstration, we take the Ustream check we did in episode 10 and re-create it in python on the Raspberry Pi and turn on the LED if our stream is up. Plus we also are capturing some statistics data.

This week we take an RFID reader and attach it to an arduino. We first show you how the RFID reader works by sending in the TAGID on the RFID Tag. Then we are going to take our project from episode 11 that takes keypad input and attach the RFID reader to create a 2 factor authentication system to simulate allowing access into a secure space.

This week we pick up where we left off from last week and remote control a servo wirelessly using Zigbee. We use the digi.com xbee module on 2 arduinos. We even do a little on the fly coding to remote control the servo in small steps. You will be amazed at how simple it is to do!

This week start the introduction to wireless communication using Zigbee with the Xbee radios from digi.com.

This week on Let's Make It we have an Arduino control a servo like you find in model airplanes and cars. In the process of showing you how to control a servo we also introduce the concept of Pulse Width Modulation (PWM) and Pulse Position Modulation (PPM).

This week we attach a keypad to an Arduino and show you how you can easily accept input. Then we build a combination door lock with that same keypad. For both projects we also use the serial LCD that we learned in Episode 5.

This week we do step 1 of our on-air light. We make the arduino check the status of the live Ustream channel. To do this we use an ethernet shield to poll the Ustream API to check the status of our strem. We learn how to setup the ethernet shield and then poll a web server. We also introduce you to JSON and a new JSON Library in this episode of Let's Make It.

This week on Lets Make It we build a random dice roller. We learn how to use randomization in our Sketches. This project will randomly roll the die between 15 and 25 rolls before landing on the final number.