LED Tester with LCD Display

LED-Tester-ready

David @ robotroom.com build a microcontroller based LED tester with LCD display that shows the LED voltage, the current limit in mA, the desired led voltage and the calculated resistor value. The LED tester is based on ATtiny84 mcu which performs all the measurements and calculations and updates the display. Build details on the link below.

The adjustment trimpots are on the end of the tester. The trimpot with the thumb dial is to indicate the target circuit voltage (usually 5 V or 3.3 V). The other trimpot requires a screwdriver, because it controls current, which I usually want to keep at 20 mA.

LED Tester with LCD Display – [Link]

25 Useful Arduino Shields That You Might Need to Get

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Rui Santos @ randomnerdtutorials.com has compiled a list of 25 useful Arduino Shields that you might want to use on your next projects. The list includes Ethernet shield, Relay, Motor, LCD and many more.

Arduino shields are boards that will expand the functionalities of your Arduino. You just need to plug them over the top of the Arduino board. There are countless types of shields to do countless tasks.

25 Useful Arduino Shields That You Might Need to Get – [Link]

The world’s tiniest temperature sensor is powered by radio waves

wireless batterijloze thermometer van PhD Hao Gao, vakgroep Mixed Signal Microelectronics, EE TU/e

Researchers at the Eindhoven University of Technology in the Netherlands have created what they call the tiniest temperature sensor that is powered by the same wireless network it uses to communicate data. The sensor measures 2 square millimeters and needs no physical connection to send data. The current version of the sensor has a range of 2.5 centimeters but this is something to be improved in future versions.

The sensor contains an antenna that captures the energy from the router. The sensor stores that energy and, once there is enough, the sensor switches on, measures the temperature and sends a signal to the router. This signal has a slightly distinctive frequency, depending on the temperature measured. The router can deduce the temperature from this distinctive frequency.

The world’s tiniest temperature sensor is powered by radio waves – [Link]

MC9RS08KB4CFK Minibot

The Minibot is a small autonomous robot vehicle that uses phototransistor that can detect lightness patterns on the ground to follow the edges of the dark lines. It has a MC9RS08KB4 MCU, coin cell, motor, and a phototransistor. The MC9RS08KB4 is part of the MC9RS08KB12 series, a family of RS08KB 8-bit microcontrollers. It features a 4KB flash size, 14 to 18 I/O pins, 8 to 12 channels of ADC, and a 126 RAM size.

The minibot is designed to be smaller than the hand and can be powered using a 3.6V coin cell. It uses a MC9RS08KB4 8-bit microcontroller. The two phototransistors are used as lightness sensors connected to the input pins of an analog comparator (PTA0 and PTA1). The two 2N7002K N-channel motors are connected to pin PTB4 and PTB5 that can be configured to the PWM ports. The LED is used for surface lighting.

The Minibot is applicable to automated guided vehicle that may be developed to larger robot or smaller robot for specific applications. The MC9RS08KB4 can be used in toys, handheld instruments, lighting control, battery charger and management, and simple logic replacements.

MC9RS08KB4CFK Minibot – [Link]

ESP8266 – Wireless Weather Station with Data Logging to Excel

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Rui Santos @ andomnerdtutorials.com has tipped us with his latest project. In this project Rui connects two ESP8266 modules and sends data from 3 sensors to an Excel spreadsheet. The process is explained in detail and some prior experience with ESP8266 is necessary and provided in tutorials.

ESP8266 – Wireless Weather Station with Data Logging to Excel – [Link]

Hacking the Zsun WiFi SD Card Reader

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makers @ hackerspace.pl decided to hack the Zsun Wifi SD Card Reader and run OpenWrt on it and turn it on a awesome wifi device.

Hacking the Zsun WiFi SD Card Reader – [Link]

Datalogging Accelerometer Data To An SDCard

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MindForge @ 43oh.com build a datalogger board which logs accelerometer values on a SD Card. The datalogger is built around an MSP430G2755 microcontroller and ADXL335 accelerometer sensor from Analog Devices.

his project started as an EMG datalogger to study my dad’s Parkinson’s disease, but after some testing I determined wearing electrodes wasn’t practical for the long term datalogging that I wanted to do, the data ended up very noisy due to RF interference and shoddy electrode to skin connections.
I moved away from the EMG idea and began working on a low-cost low-power consumption accelerometer datalogger instead.

Datalogging Accelerometer Data To An SDCard – [Link]

Arduino and RX5808 module spectrum analyzer

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garagedrone @ dronegarageblog.wordpress.com build a 5.8GHz spectrum analyzer using Arduino nano and BOSCAM rx5808 receiver module which is very popular on FPV RX (receiver) builder scene:

At the price of 9 dollars the BOSCAM rx5808 receiver module is very popular in the FPV RX (receiver) builder scene. By default it supports only 8 channels with dip switch. But by using it with SPI interface and Arduino with rx5808-pro open source setup it becomes a comfortable deluxe RX with nice autoscan and a spectrum anlyser.

Arduino and RX5808 module spectrum analyzer – [Link]

Remote WiFi DHT11 Temperature an Humidity Display

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BoianM @ instructables.com shows us how to build a remote temperature and humidity display using DHT11 sensor and two ESP8266 modules. To program the ESP8266 modules a visual programming software is used.

The advantage of the ESP8266 over Arduino and other controllers is the builtin Wi-Fi. In this Instructable I will show you how with the help of Visuino you can use two ESP8266 modules to make a remote LCD Display for Temperature and Humidity DHT11 sensor.

Remote WiFi DHT11 Temperature an Humidity Display – [Link]

A beginner’s guide to Arduino

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tttapa @ instructables.com has posted a detailed introduction to Arduino, mainly focused on beginners. It starts from the basic concepts of electronics and goes through different Arduino examples such as LED blink to stepper motor drive.

After some years of experimenting with Arduino, I decided that the time has come to share the knowledge I’ve acquired. So I here it goes, a guide to Arduino, with the bare basics for beginners and some more advanced explanations for people who are somewhat more familiar with electronics.

A beginner’s guide to Arduino – [Link]