Key reading circuit saves I/O pins: 03/06/03 EDN-Design Ideas / Some microcontroller applications usually use too many I/O pins to read keys or onboard switches; in many cases, few pins remain available for other uses. Some alternative ways to read keys yield more free pins. First, consider some ways to effect key reading. Table 1 presents a comparison of four methods with references to circuit configurations (figures 1, 2, 3, and 4)

Kodak DC 20 Camera Interface (PIC12C509):
Kodak DC 20 Camera Interface (PIC16F84):

LCD Serial Terminal:
LCD to PIC16C54 Schematic:

Low Cost Digital Thermometer Uses SingleChip Microcontroller : 02/18/02 Electronic Design – Ideas for Design / In many applications, the ability to read and display temperature is either desirable or an absolute requirement. Some of these applications include temperature probes, thermostats, CPU monitors, and process-control equipment. The …
Low Voltage Reset operates Below 2.7V: 03/26/98 EDN-Design Ideas

Mains Clock Controller using AT89C2051:
Make a DAC with a microcontroller’s PWM timer: 09/05/2002 EDN – Design Ideas / Many embedded-microcontroller applications require generation of analog signals. An integrated or stand-alone DAC fills the role. However, you can often use PWM signals for generating the required analog signals. You can use PWM signals to create both dc and ac analog signals. This Design Idea shows how to use a PWM timer to simultaneously create a sinusoid, a ramp, and a dc voltage..

Make noise with a PIC : 08/07/03 EDN-Design Ideas / Building a stable noise generator for audio-frequency purposes requires only a few components. The circuit in Figure 1 relies on linear-feedback shift registers and some simple software. An eight-pin Microchip (www.microchip.com) PIC12C508 controller (IC2) with a short program generates pseudorandom noise at its output pin, GP0….
Microchip PIC ICD (in Circuit Debugger):

Microchip PIC ICSP implementation:
Microcontroller Becomes Multifunctional: 10/25/01 EDN-Design Ideas / PDF contains multiple circuits – scroll to find this circuit.

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