# 9-Axis IMU LESSON 4: Plotting Serial Data from Arduino with Control of Axis Scale

As this project continues it is very important for us to be able to quickly and easily plot data streaming from the sensor. The Arduino Serial Plotter has some real limitations, we recommend a simple “Serial Plotter” tool that can be downloaded. In this video we take you step by step through the download and installation process, and then an overview of how to use the tool.

# Arduino Tutorial 26: More Fun with Photo Resistors

In this lesson we create an audible signal where the tone of the signal is proportional to the brightness of the light in the room. We use a photoresistor to measure the light in the room, and then use a passive buzzer to create the audible signal. The video shows you how to hook everything up, and the code we use is below. Your code might be a little different, as the math will depend on the light values where you are.

If you want to follow along at home, you can order the Arduino Kit we are using HERE. The nice digital voltmeter used in the lesson is available HERE.

# Arduino Tutorial 25: Understanding Photoresistors and Photo Detectors

In this lesson we learn how to use photoresistors. A photoresistor is a semiconductor material. In the darkness, it has almost no free electrons, so its resistance is very high. When light shines on the device, electron hole pairs are created, and these electron hole pairs are free to conduct electricity. This lowers the resistance of the material. The brighter the light, the more electron hole pairs that are generated, and hence the lower the resistance. Hence, the resistance of these devices is inversely proportional to the brightness of the light. By hooking a photoresistor in series with a fixed resistor, the current will change as the resistance of the sensor changes. This leads to a measurable change in the voltage across the series resistor. Hence, by measuring this voltage, you get a signal that is proportional to the light. This can be read via an analog pin on the Arduino, and then the arduino can be programmed to do different things based on the brightness of the light. In this simple project we have a red LED and a green LED. If the light is on, the green LED is turned on. If the light is off, the red LED is on.

If you want to follow along at home, you can order the Arduino Kit we are using HERE.

The nice digital voltmeter used in the lesson is available HERE.

Below is the code we developed in this video lesson above.

# Arduino Tutorial 24: Understanding Passive Buzzers

In this lesson we show you how to incorporate sound into your project using a passive buzzer. Passive Buzzers have the advantage that they are less expensive than active buzzers, and you can more precisely control the tone. This lesson will show you how to hook up the buzzer, and then how to code the arduino to produce different tones.

If you want to follow along at home, you can order the Arduino Kit we are using HERE.