usb charger doctor

USB Charger Doctor Unboxed

T.K. Hareendran - 07/05/15

Recently I bought a little gizmo called as “USB Charger Doctor” from an online store. The little usb [...]
arduino fingerprint module

How To Use Fingerprint Identification Modules

T.K. Hareendran - 05/18/15

Biometric identification from a print made by an impression of the ridges in the skin of a finger [...]
Mains Voltage Sensor circuit

Mains Voltage Sensor

T.K. Hareendran - 05/07/15

This compact mains voltage sensor is intended to monitor and signal to another circuit, for instance a microcontroller, [...]
circuit diagram of the wind sensor from modern device

Measuring Air Flow

T.K. Hareendran - 04/24/15

Here is an introduction to the low cost anemometer (wind sensor) from Modern Device ( . This small [...]
humidity to frequency converter circuit

Light & Humidity To Frequency Converter

T.K. Hareendran - 04/21/15

TSL235R is an eternal light-to-frequency converter, and its sensors are widely used as light sensor heads in today's [...]
current sensor circuit

Current Sensor Module For Microcontrollers w/ ACS712

T.K. Hareendran - 02/14/15

The title says it all - this article describes a microcontroller-compatible current sensor module you can build yourself, [...]
RPM sensor module circuit

RPM Sensor Module For Robotics w/ UGN3503

T.K. Hareendran - 10/20/14

If you are in a plan to build your own speedometer for your next robotic vehicle, ofcourse you [...]
battery voltage level indicator

Robot Battery Meter

T.K. Hareendran - 07/10/14

Often, simple robotics projects are powered from a small power bank consists of common dry cells (1.5Vx4=6V) or [...]
Low Voltage Battery Level Indicator Circuit 1

Low Voltage Battery Level Indicator

Jim Keith - 06/11/14

Up to now, this battery level indicator design was limited to 12 & 24V applications. In past circuits, [...]

AC Continuity Tester

GaryC - 01/02/14

This article details an AC-based continuity tester designed for frontline test and repair jobs. The circuit provides a [...]
ebay Current Transformer

Current Transformer AC Load Indicator LED

Jim Keith - 12/29/13

A current transformer (CT) is a simple, practical and inexpensive means of detecting the presence of AC current. [...]
Continuity Tester Schematic

Continuity Tester Differentiates Resistance

Jim Keith - 09/10/13

This simple but clever continuity tester sports two LEDs: RED LED = circuit resistance is < approx 10K, [...]
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