SD Card Data Recorder

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by sameer:

We always try to know the physical and electrical data like temperature, pressure, current, ac voltage etc. In this project, I’m going to display these data in the real time as well as I’ill record it to a memory card(SD/microSD/MMC card). Here the project can display four different things; ac voltage, environment temperature, relative humidity and the real time in 12 hrs format.

SD Card Data Recorder – [Link]

RELATED POSTS

ESP8266: Meet Thirsdee, the Intelligent Plant Helper

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by Dani Eichhorn :

It’s amazing what you can do with just a few components: a load cell, a high gain analog-to-digtal converter and a NodeMCU module. You can for instance measure the water consumption of your dear plants. If you combine the previous mentioned components with a OLED display you can even visualize the current water level in the plant pot. And if the level reaches a critical low you can have it send an alarm message to your cellphone. Now connect everything and give it a name: Thirsdee is born!

ESP8266: Meet Thirsdee, the Intelligent Plant Helper – [Link]

Basics of Tunnel Diodes and their applications

by w2aew @ youtube.com:

Tunnel diodes are a bit rare these days, but still have uses in special applications including extremely high frequency oscillators, etc. They were commonly used in microwave circuits, oscilloscope trigger circuits, and other applications. This video reviews the basics of tunnel diodes, including the basic properties and simple applications. I refer to these as the “bucking bronco” of diodes because of the IV curve that jumps around, and the fact that these diode will jump into wild oscillation if you just look at them funny!

Basics of Tunnel Diodes and their applications – [Link]

DIY Double Sided 60W LED UV Radiation Unit With Vacuum Pump

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Kurt Skauen writes:

This is a description of how I designed and built my UV exposure box. After experimenting a bit with dry-laminate photo-resist and liquid UV hardened solder mask I decided to stop trying to improve my toner transfer technique and rather build a proper UV radiation unit for making printed circuit boards.

I wanted it to be powerful and compact so I decided to use UV LEDs as the UV source. The preferred wavelength for the LEDs would probably be 365nm, but those LEDs turned out to be hard to find, and very expensive. The 395nm-405nm LEDs on the other hand are very inexpensive. And best of all, can be bough as high-density LED-strip’s on 5-meter rolls. So I bought two “5M Ultraviolet 395nm 3528 SMD LED” rolls that have 120 LEDs per meter for a total of 600 LEDs per roll. From what I could tell from a bit of googling the wavelength should work even though it is not ideal. Initial tests proved that the 395nm LEDs worked very well.

DIY Double Sided 60W LED UV Radiation Unit With Vacuum Pump – [Link]

Compost Sensor

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by kinasmith @ instructables.com:

This is a tutorial on building a Compost Temperature monitoring system. It details how to build a web connected wireless sensor network and shows one possible way it could be constructed.

A Medium level of knowledge and skills are required. Basic knowledge of soldering and breadboarding will be very useful. I will assume that you know enough Arduino code to understand what a Function is, how a Library is useful, and why Serial Communication is important. And you will need to know enough electronics to understand what I mean with terms like Voltage, Current, Resistance, etc. A (very) basic knowledge of how radio works would also be useful for understanding the concepts, but not essential for following along. This is not advanced by any means and I will attempt to always reference materials that will cover these concepts in greater detail.

Compost Sensor – [Link]

How to use an RGB LED – Arduino Tutorial

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by codebender_cc @ instructables.com:

An RGB LED has 4 pins, one for each color (Red, Green, Blue) and a common cathode. It has tree different color-emitting diodes that can be combined to create all sorts of color! Any color is possible depending on how bright each diode is.

How to use an RGB LED – Arduino Tutorial – [Link]

LM5160A Wide Input 65V, 1.5A Synchronous Buck / Fly-Buck™ Converter

 

TI introduces industry's first 65-V synchronous step-down converter with Fly-Buck(TM) capability (PRNewsFoto/Texas Instruments)
TI introduces industry’s first 65-V synchronous step-down converter with Fly-Buck(TM) capability (PRNewsFoto/Texas Instruments)

LM5160A 65V, 1.5A synchronous buck converter with integrated high-side and low-side MOSFETs is the industry’s highest power synchronous buck regulator and supports TI’s innovative Fly-Buck™ topology to deliver isolated bias supplies up to 15W with no opto-isolator.

LM5160A offers great flexibility which enables direct point-of-load regulation from a wide input voltage range of 4.5V to 65V and also simplifies isolated DC/DC designs by enabling very good output regulation with no opto-coupler required.

LM5160A Wide Input 65V, 1.5A Synchronous Buck / Fly-Buck™ Converter – [Link]

Wino… like Arduino, only smaller

20150624024339_Winoby Martin Cooke:

The Wino board is an Arduino-like stackable development system which is both smaller and cheaper than Arduino units and features built-in WiFi as standard.

The main Wino controller board measures 26.5 x 18.5 mm and fitted with an Atmel ATSAMD21 running at 48 MHz with 128 kB Flash storage and 16 kB RAM. The board uses the ESP8266EX WiFi module which supports all the 802.11 b/g/n standards offering P2P and soft-AP modes and TCP-IP / UDP, static IP and DHCP networking. The 27-pin stackable connections around the board periphery provide connections for 15 digital GPIO pins, 6 x 12-bit ADCs and a 1 x 10-bit DAC.

Wino… like Arduino, only smaller – [Link]

A Guide to using FETS for Sensor Applications

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by Ron Quan:

In some JFET op amps such as the AD743, the input capacitance is in the order of 18 to 20 pF. In comparison, with an LSK489 dual FET, the input capacitance is in the order of 3 pF, which will be suitable for low noise photodiode applications. In this section we will see why it is important to have low equivalent input noise and low input capacitance in a photodiode preamp.

A Guide to using FETS for Sensor Applications – [Link]