Microcontroller directs supply sequencing and control: 05/29/03 EDN-Design Ideas / With the proliferation of dual-voltage architectures and multiprocessor boards, even simple applications can require several processor voltage rails. With each processor having its own power-up and down requirements, power-rail sequencing and control can become a complex task. The challenge for power-supply designers is to consider each processor’s timing and voltage requirements and assimilat….

Microcontroller discerns addresses in RS 485 systems: 11/08/2001 EDN – Design Ideas / One of the many benefits of using the RS-485 data-interface system, unlike the RS-232 system, is its ability to implement multidrop networks. Such networks usually carry 9-bit data words, in which the ninth (parity) bit identifies each word as address or data. When using small microcontrollers without a hardware UART, such as IC1 in Figure 1, designers must decide whether to add an exte… .
Microcontroller emulates numerically controlled oscillator: 02/21/2002 EDN – Design Ideas / Microcontrollers commonly add intelligence or digital functions to products, but they can also provide a variety of analog signals. An 18-pin PIC 16C54 microcontroller, combined with an inexpensive, 8-bit DAC and a simple lowpass filter, can generate sine waves from dc to approximately 50 kHz with a tuning resolution of 24 bits. .

Microcontroller emulates numerically controlled oscillator: 02/21/2002 EDN – Design Ideas / Microcontrollers commonly add intelligence or digital functions to products, but they can also provide a variety of analog signals. An 18-pin PIC 16C54 microcontroller, combined with an inexpensive, 8-bit DAC and a simple lowpass filter, can generate sine waves from dc to approximately 50 kHz with a tuning resolution of 24 bits. .
Microcontroller Interface for 5KWatt Microwave oven:
Microcontroller Makes Effective Frequency Counter: 11/23/00 EDN-Design Ideas / PDF contains multiple circuits – scroll to find this circuit.

Microcontroller Multi Channel Light Dimmer:
Microcontroller MultiChannel Light Dimmer: The project is a microprocessor-controlled multiple channel lighting dimmer, that could be used in theatrical and other applications. The device will accept input from a wide range of interfaces: RS232 input, DMX512 (theatrical lighting standard) or RS485, or a Musical Instrument Digital Interface (MIDI). The device will control a number of lamps by using some form of AC power control. The firmware in the microcontroller will handle all functions, from decoding the protocol on either of the input interfaces through to Timing the firing of power triacs for the output.

Microcontroller provides SRAM battery backup: 06/26/03 EDN-Design Ideas / To maintain content in the event of power loss, many designs that include SRAM require a dedicated device that can automatically switch from a standard power supply to battery operation. Microcontrollers seldom find use in power-switching applications. Because microcontrollers typically operate from the primary power supply, they stop execution if that supply drops, thereby making it impossible….
Microcontroller selects minimum/maximum value: 09/20/2001 EDN – Design Ideas / Microcontroller-based systems for measurement, sensor-data processing, or control, sometimes require you to determine a maximum or minimum data value. For example, in an object-detection system, such as a radar or sonar system, the microcontrolle.

Microcontroller Sensor and Actuator Interfaces:
Microcontroller Watches, Controls AC Power: 06/22/95 EDN-Design Ideas circuit allows an isolated microcontroller to both sense and control ac power to an externally plugged-in device

Microprocessor RS 232 Reset:
Microprocessor RS232 Reset:

MiniLOGGER V1.0:
Mk2 PC Based EPROM Programmer:

MMC to PIC16F876 Circuit Diagram:
Multi Chip Programmer:

Multimedia Electronic Crib: microcontroller based light controller which generates sequence of day-night with light fading, optional serial control interface, based on 87C51
Network Time Protocol AVR Clock:

Night Light Saver (PIC12C508):
Nixie Clock (PIC16F876):

No Parts PIC Micro Programmer:
One Microcontroller Serves Multiple External Interrupts: 02/01/01 EDN-Design Ideas / PDF contains multiple circuits – scroll to find this circuit.

Optical Sensor using PIC12C508:

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