Circuits & Schematics: PLHL-T808A schematic - 2

11. Heart rate measurement from fingertip. Part 1. Schematic
    Circuits Medicine Microcontrollers Usage
    Introduction Heart rate measurement indicates the soundness of the human cardiovascular system. This project demonstrates a technique to measure the heart rate by sensing the change in blood volume in a finger artery while the heart is pumping the ...
    Feb 11, 2011

12. 255-Voice PCM Sound Generator. Part 1. Schematic
    Circuits Audio Games Microcontrollers Usage
    This is a simple sound generator based on 8-pin SD Audio Player . It is built with an Atmel ATtiny861 microcontroller from Atmel and an SD memory card. The tiny861 has fast PWM outpus like tiny85 so that it can generate clear sound compared to any ...
    Mar 14, 2011

13. 2-Wire Keypad Interface Using a 555 Timer. Part 1 Theory and Schematic
    Circuits Microcontrollers Usage
    Keypads are a very commonly used input device in microcontroller-based systems. In a keypad, multiple switches are arranged in rows and columns so that they could be interfaced to a microcontroller with a minimum number of I/O pins. For example, a ...
    Mar 25, 2011
14. microSD ATmega32 Data-Logger. Part 1. Schematic and base components
    Circuits Automation Measurement Microcontrollers Usage
    .. if you visit the original post first as it would be a better starting place for learning SD or FAT32 functions. Here is the schematic: Click to enlarge The project contains RTC interface on DS1307 (for date and time storage), RS232 on ...
    May 25, 2011
15. µProg - tiny, fast, portable AVR programmer with SD. Part 1. Features, Schematic and Description
    Circuits Microcontrollers Usage
    .. Atmega1280, Atmega1281, Atmega1284, Atmega1284P, AT90usb1286, AT90usb1287, AT90can128 256kB: Atmega2560, Atmega2561 Schematic Diagram Кликните для увеличения Internal Atmega328P oscillator can be calibrated in very wide range. ...
    Jun 21, 2011
16. Voltage monitor for car's battery and its charging system. Part 1. Schematic
    Circuits Measurement Microcontrollers Usage
    My 2010 Equinox has got every feature that a modern automobile should have. However, one thing that I personally find missing is the real-time monitoring of voltage across the car’s battery terminals. This may not seem to be that important ...
    Jul 18, 2011
17. Atmega8 measures ambient temperature and relative humidity using HSM-20G sensor. Part 1. Schematic
    Circuits Measurement Microcontrollers Usage
    In one of my previous posts, I discussed about Sensirion’s SHT11 and SHT75 sensors, which are capable of measuring both temperature and relative humidity. They are digital sensors and provide fully calibrated digital outputs for temperature ...
    Jul 29, 2011
18. USBTiny-MkII SLIM programmer. Part 1 - Schematic
    Circuits Microcontrollers Usage
    The project is intended for noncommercial usage only Paweł Kisielewski USBTiny-MkII SLIM programmer (AVRISP-MKII clone) supports all Atmel ATtiny, ATmega, and Xmega µcontrollers. It has three programming interfaces: ISP, PDI, and TPI. It ...
    Aug 10, 2011
19. Quick Key Adapter, 10 Button HID Keyboard. Part 1. Schematic and PCB
    Circuits Interfaces Computers and Peripherals Microcontrollers Usage
    .. USB Development Kit which uses a PIC18F14K50 . The development kit is not required to recreate this as included here is a schematic, PCB layout and firmware to build one from scratch. It does not require any external power supply, it ...
    Sep 7, 2011
20. Add 512K of external SRAM to Arduino Mega. Part 2 - Schematic and PCB
    Circuits MCU Open-Source Platforms Microcontrollers Usage Arduino Arduino Arduino Mega
    .. are used by the xmem interface, those in green will be used by me to control the active memory bank. Here’s the full schematic that I created using the free version of the Eagle PCB CAD design program. Click to enlarge The ...
    Sep 15, 2011

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