monitor | Battery Guide

Building a MicroPython heart rate monitor | Finding the beat in HR sensor data

Pulse sensors have become popular due to their use in health-monitors like the Fitbit. The sensors used are cheap, simple and pretty reliable at getting a reasonable indication of heart rate in daily use. They work by sensing the change in light absorption or reflection by blood as it pulses through your arteries — a technique […]

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pickit 3 pinout – connection diagram

pickit 3 Description Microchip’s PICkit3 In-Circuit Debugger/Programmer uses in-circuit debugging logic incorporated into each chip with Flash memory to provide a low-cost hardware debugger and programmer. The MPLAB PICkit3 allows debugging and programming of PIC® and dsPIC® Flash microcontrollers at a most affordable price point using the powerful graphical user interface of the MPLAB Integrated Development

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Door Status Monitor using the ESP8266

In this project you’re going to monitor the status of a door using an ESP8266. The goal of this project is to show the endless possibilities that this $4 WiFi module offers when integrates with a free platform that I’m about to show you. Before continue reading this project, please complete the following tutorials or use them as a reference: How to

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GPS REPEATER/SYSTEMS MONITOR using PIC16F876

Introduction This circuit is a repeater for GPS data. It is intended to connect to Garmin-38 (and similar) hand held GPS receivers that don’t have external antennas. The purpose for the repeater is to allow the GPS to be outside, exposed to the satellite view, and allow the user to see the data below decks

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DIY, Microcontroller-Based Battery Monitor for RC Aircraft

I’ve had good cause to be reading and perusing a few old Circuit Cellar articles every day for the past several weeks. We’re preparing the upcoming 25th anniversary issue of Circuit Cellar, and part of the process is reviewing the company’s archives back to the first issue. As I read through Circuit Cellar 143 (2002)

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LT3089 – 800mA Single Resistor Rugged Linear Regulator with Monitors

Features Extended Safe Operating Area Maximum Output Current: 800mA Stable with or without Input/Output Capacitors Wide Input Voltage Range: 1.2V to 36V Single Resistor Sets Output Voltage Output Current Monitor: IMON = IOUT/5000 Junction Temperature Monitor: 1μA/°C Output Adjustable to 0V 50μA SET Pin Current: 1% Initial Accuracy Output Voltage Noise: 27μVRMS Parallel Multiple Devices

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12V Lead Acid Battery Voltage Monitor

Description 12V Lead Acid Battery Monitor is a simple project which tells you the voltage of your Lead acid battery visually with the help of 10 LED’s. This project is based on the popular LM3914 IC from Texas Instruments. The LM3914 senses the voltage level at the input pin and drives the 10 light emitting

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Noncontact sensors monitor respiration and movement

Novelda, with its XeThru technology based on UWB microwave sensing, offers medical grade monitoring of respiration that can be easily used in everyday lives and homes. With its wireless measurement principle, and non-contact capability, users are not bound by wearing on-body sensors or keeping them charged every day. The respiration module will detect body movement,

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Designing a mains frequency monitor

Designing a Mains Frequency Monitor, Part 2 This is the second in a series of posts about designing a mains frequency monitor using the Microchip PIC 16F1619 microcontroller. In this post we will take a look at the first revision of the board that I designed for the project and some of the features that

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