A DIY indoor thermometer plus hygrometer using PIC16F688

This project is about building a microcontroller-based digital room thermometer plus hygrometer that displays temperature and relative humidity on 4 large (1 inch) seven segment LED displays which adjust their brightness level according to the surrounding illumination. It consists of a closed loop system that continuously assesses ambient light condition using an inexpensive light-dependent resistor (LDR) a ...

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PIC-based Digital Voltmeter (DVM)

Introduction This project will describe how to make a simple digital voltmeter (DVM) using a PIC16F688 microcontroller. The range of this DVM is 0-20V, but you can easily increase or decrease the range of input voltage as your requirements after you understand the voltage scaling method described in this project. The PIC micro reads the input voltage through one of the 8 analog channels and convert it to a ...

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A Digital temperature meter using an LM35 temperature sensor

Introduction A digital thermometer is a good choice of project for beginners who just stepped in to the world of microcontrollers because it provides an opportunity to learn using sensors to measure the real world signals that are analog in nature. This article describes a similar project based on a PIC16F688 microcontroller and an LM35 temperature sensor. LM35 is an analog sensor that converts the surround ...

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TrH Meter: A DIY indoor thermometer plus hygrometer with adaptive brightness control implemented to 7-segment LED displays

This project is about building a microcontroller-based digital room thermometer plus hygrometer that displays temperature and relative humidity on 4 large (1 inch) seven segment LED displays which adjust their brightness level according to the surrounding illumination. It consists of a closed loop system that continuously assesses ambient light condition using an inexpensive light-dependent resistor (LDR) a ...

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Color Globe using PIC16F688 Microcontroller

This was a fun little project I put together in a few hours for a homemade-themed gift exchange this Christmas.  I had on-hand a "Full Color LED" from Radio Shack (part 276-0028) which caught my eye on my last visit there. The LED has a common anode and three cathodes, one for each of the three primary colors: red, blue and green.  By changing the duty cycle (the fraction of time the pin is low) on each of ...

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The Magnetometer using PIC16F688

I found several different magnetometer designs on Internet, but I tend to be very picky. None of those was what I needed - something that is sensitive enough to record the small magnetic field variations where I live (San Jose, California), robust enough to work for long periods of time without constant maintenance, and relatively easy to construct. Since the only place where I could permanently install the ...

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Revised version of LM35 based digital temperature meter using PIC16F688

This is a revised version of my LM35 based digital thermometer project that I posted last year. Although it is one of the simplest projects, it is very popular among newbies who are just starting to learn microcontrollers. There was a little flaw in the original project as pointed by some readers. I was using a 1.2 V reference for A/D conversion with PIC16F688 microcontroller. However, the PIC16F688 datashe ...

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Motion Activated Led Dice using PIC16F688

Introduction   I've always wanted to build an electronic led dice, but something different from what we see on the internet. Making it motion controlled... now that's new!   Many new cell phones that have accelerometers built in also have dice games. These dice move when shaking the cell phone. My Led Dice project will also work with a shake motion but without the use of the expensive accelerometers. Parts ...

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PIC16F688 breadboard module for quick prototyping

This module is based upon the basic setup circuit for PIC16F688 that I have described in one of my PIC lessons, Getting ready for the first lab. I thought of soldering this circuit on a general purpose ptototyping board and use male headers to access the power supply pins and I/O ports of the PIC16F688 microcontroller. This will free up a lot of space on the breadboard as the ICSP header and the reset switc ...

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Lab 3: Four bit binary counter using PIC16F688

Description Today’s lab session is about binary counting LEDs. The binary 1 and 0 will be represented by turning LEDs on and off. You will make a 4-bit binary counter (using 4 LEDs) that counts from 0 to 15 (0000-1111 binary). The four LEDs are connected to RC0 through RC3 port pins of PIC16F688 with current limiting resistors (470Ω each) in series. A push button switch is connected to pin RC4 to provide in ...

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