Arduino Milliohm Meter
ArduinoTest/Measurements

Arduino Milliohm Meter

danielrp @ instructables.com writes: This is an accurate milliohm meter with a maximum resolution of 0.1mOhm. The design is very simple, the whole assembly can be built in a couple of hours once all the parts are gathered. It is based on a precision current sink and a high-resolution...

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Build Your Own I2C Sensor
Raspberry Pi

Build Your Own I2C Sensor

Since Raspberry Pi doesn’t have a built-in ADC (Analog to Digital converter) to read the voltage off from most of sensors, the best solution is to add I2C ADC chips and modules to your project. Paweł Spychalski faced this problem while building his own weather station that is based...

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Adding ADC to Microcontrollers without ADC
Mcu

Adding ADC to Microcontrollers without ADC

Scott @ swharden.com show us how to interface an analog signal to a microcontroller that doesn't have an ADC. I recently had the need to carefully measure a voltage with a microcontroller which lacks an analog-to-digital converter (ADC), and I hacked together a quick and dirty method...

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How To Connect Multiple Buttons with MCU Using One Line
ArduinoBasic ElectronicsMcu

How To Connect Multiple Buttons with MCU Using One Line

One of the biggest problems you could face in your current/next project, is when you’re out of free inputs to use. Sometimes you can save a lot of inputs using some tricks, and there’re really a lot of them. In this blog post we’re going to know how you can use many push buttons...

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How to use a fully differential amplifier as a level shifter
Interface

How to use a fully differential amplifier as a level shifter

Loren Siebert @ ti.com discuss about how to interface signals that have a reference voltage that isn't 0V while preserving the DC information. Many signal paths are direct current (DC)-coupled, and this can lead to challenges when different portions of the signal path require...

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Analogue Sensors – Calculate the Nonlinearity Introduced by a Load or Pull Down Resistor
Basic Electronics

Analogue Sensors – Calculate the Nonlinearity Introduced by a Load or Pull Down Resistor

Tecwyn Twmffat @ instructables.com discuss about the notlinearity introduced by adding a pull down resistor and why you may get unpredictable readings from your ADC. For many years I found that I would get strange, unpredictable, readings from my sensor related projects at the...

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Simple circuit provides precision ADC interface
Interface

Simple circuit provides precision ADC interface

Moshe Gerstanhaber @ edn.com provides an simple ADC interface using instrumentation amplifier IC. Real-world measurement requires the extraction of weak signals from noisy sources. High common-mode voltages are often present even in differential measurements. The usual approach to...

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Automatic monitor brightness controller
Mcu

Automatic monitor brightness controller

Dilshan Jayakody build a auto monitor brightness controller that adjusts your monitor brightness according to lighting conditions. He writes: The sensor unit of this system is build around PIC18F2550 8-bit microcontroller. To measure the light level we use LDR with MCU's inbuilt ADC....

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