User manual

LPCXpresso Experiment Kit - User’s Guide

Page 138

8.15 Polyphonic Audio Generation

Create an audio output with speaker amplifier. A low-pass filtered PWM-output can be used to

generate the audio waveform. Implement polyphonic tone generation and play a melody with multiple

tones.

8.16 Audio Processing

Create an audio interface with both input and output. Create audio effects, for example an echo

chamber. Alternatively create a system for voice recording and playback.

8.17 Home Automation

Create a system for home automation. There are many different systems that can be created for

handling ventilation, heating, blower watering, lighting, etc. It can be something very small or a big

system with remote nodes communication wirelessly and presenting information on the Internet.

8.18 Control a Robot

Find a suitable mechanical platform and let the LPC111x control the robot hardware.

8.19 RS-485 Network

Create an RS-485 network and define a protocol for reliable communication, for example a token

passing protocol.

8.20 Interface an FPGA/CPLD Chip

Create a project that interface a programmable hardware chip (FPGA or CPLD). There are many small

breakout boards ion the market with these kinds of chips. Implement some kind of hardware in the

programmable chip and then let the microcontroller control this functionality. It can be like an additional

peripheral to the microcontroller.

8.21 Analog Electronic Experiments

This is more than just one individual project idea. The experiments and kit content address digital

electronics. There is a whole world of analog electronic also, including the interface between the

analog world and the digital world. Create own experiments to learn areas of interest, for example:

 How to use a comparator to interface an analog signal to a digital input.

 How to adjust the range of an analog signal before feeding it to an ADC (Analog to Digital

Converter), both gain and offset.

 How to apply low-pass filtering before sampling an analog signal. What are the theoretical

requirements and practical implications?

 How to create an analog signal via low-pass filtering a PWM signal.

 How to create a capacitive touch sensor.

 How to use an opto-coupler to galvanically isolate a digital signal.