There are two built-in light-emitting diodes (LEDs) near the bottom-right corner of the Activity Board WX. They are already electrically connected to Propeller I/O pins P26 and P27.
These LEDs are helpful when developing applications that use sensors. The idea is to build a program that turns on an LED when a sensor is activated. Then you, the roboticist, can get a quick visual cue that the sensor is actually detecting something.
This chapter introduced the first sensor system for the BOE Shield-Bot, and allowed the robot to roam around on its own and navigate by touch. The project built on skills acquired in the last chapter, and employed a variety of new ones:
The first breadboard circuit we'll build is a simple piezo speaker. Many devices in our daily lives use beeps to communicate with us, such as microwave ovens, car locks, smoke detectors, forklifts driving in reverse—can you think of more examples? Likewise, it is useful to equip your ActivityBot to communicate with you via sound.
The first breadboard circuit we'll build for the ActivityBot is a simple piezo speaker. Many devices in our daily lives use beeps to communicate with us, such as microwave ovens, car locks, smoke detectors, forklifts driving in reverse—can you think of more examples? Likewise, it is useful to equip your ActivityBot to communicate with you via sound.
Drive your ActivityBot remotely using a Joystick mounted on an Activity Board! This is a simple and fun C-language project you can complete in less than two hours.
SPI is a communication protocol used to exchange data between IC's and computing tools like microcontrollers. This tutorial uses the MMA7455 3-Axis Accelerometer to go in-depth about the CLK, DATA, and /CS pins used frequently in SPI communcation, and how to develop your own test code from information found on the product's datasheet.The image below shows the schematic for the Boe-Bot with the accelerometer circuit. The servo and piezo speaker connections are from Robotics with the Boe-Bot (#28125). The connections for the accelerometer are featured in Chapter 3 of Smart Sensors and Applications.
Set up a circuit to monitor pushbuttons, and use them to control LED lights with this Propeller C - Simple Circuits tutorial.
Learn first how to make noise and then how to make music with your Propeller board and a simple Piezo speaker in this Propeller C - Simple Circuits tutorial.
