Infra-Red Proximity sensors (PART 1) Based on a simple basic Idea, this proximity sensor, is easy to build, easy to calibrate and still, it provides a detection range of 35 cm (range can change depending on the ambient light intensity). For simplicity, this sensor doesn't provide ambient light immunity, but the Next article (PART 2) treats this problem.

Infra-Red Proximity sensors (PART 2) This article deals with a more advanced IR proximity sensing scheme, it is also more expensive but provides more accurate results even in sunny outdoor environment. This sensor is practically not affected by ambient light, and it can provide detections ranges that exceed 1 meter.

99 000 RPM Contact-Less Digital Tachometer This article describes how to build a contact -less tachometer (device used to count the revolutions per minute of a rotating shaft) using a 8051 microcontroller and a proximity sensor.

Build a 40Mhz Frequency meter This article shows how to build a small, cheap and simple frequency meter, without any fancy, out of reach components. The simple proposed design can measure frequencies up to 40 Mhz with errors below 1%!. Based on an ATMEGA16 microcontroller.

Build a 500 KHz Frequency meter Based on the famous AT89S52 microcontroller, this 500 Khz frequency-Meter will be enough to trace and debug simple circuits, to adjust 555 timers frequency and perform all kind of frequency measurements in Digital circuits.

build a digital thermometer (DIY) This article shows you how to build a digital thermometer from the beginning to the end, using a thermistor and a 8051 microcontroller. Being based on our tutorial about Analog to Digital conversion, it is very easy to understand the functioning of the device, and you can build it with any microcontroller even if it doesn't have a built in ADC.

Can't find what your searching for, try related subjects below: Line tracking sensors and algorithms Closed-loop speed and position control for DC motors

Schematics

Simple Infra Red barrier LDR Photo cell

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Reviewed related books & kits

Electronic Sensor Circuits & Project, Forrest M., III Mims This is a reference that covers all the aspects of sensors and their applications. I didn't buy this books, but it speaks for itself on the internet; a lot readers reviewed this book on amazon website, and they all find it amazingly interesting, full of example projects, and fairly simple to understand and implement into your projects.

Electronic Sensor LAB. (Educational KIT) I remember how happy I was, years ago, when I bought this kit from RadioShake! It Has all what you need to get you started in electronics. With a set of sensors (motion, temperature, touch, pressure, magnetic, sound, light..) and all the needed equipment (batteries, wires, breadboard, ICs, potentiometers, etc..), you very start to assemble simple projects, available in the book that is shipped with the kit. **I RECOMENT THIS KIT TO ALL BEGINNERS**

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