Circuits & Schematics: pic

1. Need an extra ADC? Add one for a few cents
   Damian Bonicatto Phoenix Bonicatto
   Circuits Arduino Measurement Supply Microcontrollers Usage Arduino Arduino Nano
   .. are using: a pulse width modulator (PWM) output and an onboard analog comparator. Some MCU lines that have these are the PIC, AVR, and ATmega MCUs from Microchip. Also, TI’s Piccolo line and STMicroelectronics STM32L5 have both a PWM ...
   Apr 11, 2025

2. Practice safe dc/dc converter
   Eugene Kaplounovski
   Circuits Supply Texas Instruments LM2675
   Short-circuit protection is an obvious requirement for a power supply, especially when its load connects to a cable that's subject to damage. Many modern power-converter ICs include some means of protection, such as thermal shutdown, against ...
   Jan 22, 2025

3. Earplugs ready? Let's make some noise!
   Nick Cornford
   Circuits Oscillators Measurement Microchip PIC12F1501 MCP6002 MCP6004 MCP6022
   .. a GPIO pin delivering the PRBS but here is the MPASM assembly-language code [6] for doing it with on a Microchip 12F1501 PIC. (It should open cleanly with Notepad.) The code is logically and functionally identical to Figure 1’s ...
   Nov 28, 2024
4. 2×AA/USB: OK!
   Nick Cornford
   Circuits Supply Texas Instruments LM1117
   .. assume the kit in question is something small and hand-held or pocketable, probably using a microcontroller like a PIC, with a battery comprising two AA cells, the option of an external 5 V supply, and a step-up converter producing a ...
   May 28, 2024
5. Piezoelectric Driver Finds Buzzer's Resonant Frequency
   Mehmet Efe Ozbek
   Circuits Measurement Microcontrollers Usage Microchip PIC18F452
   Piezoelectric buzzers find wide use as audible-signal generators because of their low power consumption and clear, penetrating sound. An external driver or a self-driven circuit that oscillates at the resonant frequency of the piezoelectric element ...
   Nov 17, 2022
6. Microcontroller Controls Relays via RF Modules
   Gabriel Lee Álvarez Gerardo Quero Ricardo Jimenez
   Circuits Wireless Measurement Microcontrollers Usage Microchip PIC16F1619
   .. for the smart home, this design leverages two PIC MCUs that use a wireless RF transmitter/receiver to control up to six relays and monitor two analog signals. In ...
   Oct 25, 2022
7. Single Processor Pin Controls On/Off Function
   Michael Sirkis
   Circuits Microcontrollers Usage Texas Instruments TPS61032RSAR
   A recent Design Idea prompted me to offer the simpler solution that I used in a recent project (Reference 1). We needed a momentary power switch with processor supervision. This supervision would allow the processor to delay a power-down request ...
   Sep 1, 2022
8. Microcontroller Generates Analog Gaussian Waveform Without Need for a DAC
   Dev Gualtieri
   Circuits Microcontrollers Usage Microchip PIC12F675
   Laboratory data often appears as Gaussian curves, and today's laboratory data-acquisition software is designed to analyze these data to determine such things as peak location, amplitude, area, and width. A good test signal is useful in ...
   Jul 20, 2022
9. Use the MCLR Pin as an Output with PIC Microcontrollers
   Antonio Muñoz Pilar Molina
   Circuits Microcontrollers Usage Microchip PIC10F222 2N7002
   .. the MCLR pin either as an external reset or as an input-only pin. Figure 1. Adding a MOSFET and associated circuitry to a PIC microcontroller’s MCLR input pin transforms the pin into an output. This design uses one pin for analog input ...
   Mar 2, 2022
10. Single-wire keypad interface frees microcontroller-I/O pins
    Israel Schleicher
    Circuits Microcontrollers Usage Texas Instruments LMC555 LMC7211-N
    In most keypads, pressing a key closes a contact that bridges two lines in an xy matrix. If you use a microcontroller to detect a key closure, checking the states of (x+y) lines requires an equal number of I/O pins. Occupying only one free I/O pin, ...
    Jan 19, 2022

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