From time to time, I see people trying to build an audio VU meter. In the analog era, that’s typically done with a voltage divider + a series of comparators; or using chips like LM3914/3915. Those chips are harder and harder to find, or you may need more resolution, or a different output profile. What […]
MCU-based LED-VU Meter Read More »
First, let me introduce you my project. I made an Alarm clock with extended functionality & thermometer and humiditymeter. Everything started when my friend (who used to bring me some old electronic rubbish and I used to check if there’s not something useful) brought me some cashing register display similar like that. When I first
ATmega Alarm Clock and Thermometer Humidity meter Read More »
The TSL235 is a light-to-frequency converter. This library reads TSL235 output frequency and convert it to irradiance, and then to illuminance. Irradiance is the power of electromagnetic radiation per unit area (radiative flux) incident on a surface. It’s expressed in watt per square metre, the symbol is Ee. In photometry, illuminance is the total luminous
Irradiance/Illuminance Meter using TLR235R sensor with AVR Atmega Read More »
This project is a dust detector that use the GP2Y1010AU0F sensor. Attached you can also find the GP2Y1010AU0F sensor library for AVR Atmega.GP2Y1010AU0F is a dust sensor by optical sensing system. An infrared emitting diode (IRED) and an phototransistor are diagonally arranged into this device. It detects the reflected light of dust in air. Especially,
An optical dust meter that uses the GP2Y1010AU0F sensor library made with AVR Atmega Read More »
Summary One of the most commonly used medical instruments nowadays is the thermometer. The thermometer is used to monitor or measure the body temperature of a sick person. The idea of creating a thermometer started from a device called thermoscope, a thermometer without a scale. Several inventors developed it until Sir Thomas Allbutt invented the
Non-Contact Body Temperature Meter Read More »
A non invasive current sensor is connected to the spark core (with a few components), and clamped around a cable in the Mains distribution unit. No wiring is required, however Do not try this at home, as the Mains Distribution Unit should not be tampered with unless one is Licensed to do so. The
Non-Invasive Smart Electricity Meter Read More »
First, rise and shine, let me introduce you to my project. I’ve crafted an Alarm clock with extended functionality, including a thermometer and a humidity meter. Everything started when my friend (who used to bring me some old electronic rubbish and I used to check if there’s not something useful) brought me some cashing register
Atmega Alarmclock & Thermohumidity meter Read More »
Motivation >A breaker-level power metering device for measuring energy on 4 different circuit lines and wirelessly outputting that energy data onto Google PowerMeter. Useful Links Google PowerMeter Smart Energy Alliance DOE – SmartGrid Energy Efficient Products Similar Projects Zigbee Wireless Relay Control & Power Monitoring PowerBox: The Safe AC Power Meter edcheung.com – Power Line
XBee RF Smart Energy Compliant Power Meter Using Atmega644 Read More »
Introduction Our project measures the user’s skin conductance for monitoring his or her mental state. Summary Medical experiments have shown that the magnitude of the electrical conductance in a person’s skin is directly correlated to their emotional state. The short term changes in electrical conductances also correlate with a person’s mental response. We implemented an
Galvanic skin response meter using Atmel mega32 Read More »
Frequency meter with some of quite good performance, capable of measuring frequencies from 1Hz to 10MHz (9,999,999 Hz) with a resolution of 1 Hz over the entire range. Ideal for function generators or as a standalone meter. It is cheap and easy to make, with parts that can be bought anywhere, and with a small
AVR frequency meter from 1Hz to 10MHz Read More »
