DIY Smart Plant pot

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by Akin Yildiz @ instructables.com:

it was one year ago that i have published the plant pot – world’s first stand alone smart plant pot that can email you when it’s thirsty, cold, hot, sleeping etc.

a lot has changed since the first release. today I would like to share with you our latest and most stable version yet.

DIY Smart Plant pot – [Link]

Analog to Digital Converter module

A2-D-PIC-2

This simple A2D (Analog to Digital) Converter Board can log upto 8 channel of analog signal with 8 bit resolution. This board uses the ADC0808 chip from National Semiconductor.

Analog to Digital Converter module – [Link]

0-20V Bargraph Voltmeter

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0 – 20V LED Voltmeter kit displays the voltage of the source using 20 LED’s. This projects is based on the famous LM3914 IC from National Semiconductor.

Power Supply Input: 5 VDC Max @ 30 mA in DOT mode and 300 mA in BAR mode

0-20V Bargraph Voltmeter – [Link]

RELATED POSTS

Riverdi TFT display with FT801 controller

 

riverdi

If you are looking for a touchscreen LCD display for your next project you should take a look at Riverdi LCD solutions. Their aim is to produce innovative, high quality LCD solutions at affordable prices. They were kind enough to send us a sample of a FTDI FT801 controller LCD display along with their Arduino TFT shield to test out. This LCD display has a build in video engine that accelerates performance over standard TFT displays when used with low power MCUs.

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Therm: a Tiny PID Controller

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by Ethan Zonca @ protofusion.org:

Therm is a very small PID controller with an OLED display, thermocouple interface, and USB port. It can switch an external solid-state relay for driving large loads, or a transistor for driving small loads. When attached to a computer, it enumerates as a USB serial port for easy control and logging of data. The design is based around a STM32F0 microcontroller and the MAX31855 thermocouple-to-digital IC (note: an RTD version of therm is in the works).

Therm: a Tiny PID Controller – [Link]

Visaton Exciter – an exciting loudspeaker

obr1743_uvod

A loudspeaker without a membrane which can be mounted on any flat surface solves aesthetical and technical problems.

Fans of HiFi sound and similar „audiophils“ usually don´t cover their loudspakers and surely not their membranes. Firstly, to cover a beautiful top-class loudspeaker is almost a sin :-) and naturally all that stands in a way of sound usually influences it in a negative way.
However, totally different situation is in traffic, audio bells, industrial conditions, in various kiosks (POS) and other applications. Here a loudspeaker is usually mounted behind various covers so as to be protected from mechanical damage. For these applications we can use various industrial loudspeakers which are available in dust- and water-proof versions.

If we go even further, applications where even a perforated loudspeaker cover is undesirable – weather from aesthetical or a technical point of view. For these purposes German company Visaton offers elegant solution – “Exciter”. Visaton Exciter is in fact a loudspeaker without a membrane optimized to be mounted on a flat panel, where by a mechanical connection with a given surface a final “loudspeaker” arises. (more…)

PCA9550 LED Driver With Programmable Blink Rates

This project introduces the use of PCA9550, an LED driver that causes the 2 LEDs to ON/OFF or in a flashing state at programmable rate. It has 2 selectable, fully programmable blink rates between 0.172Hz and 44Hz or 5.82 seconds and 0.023 second respectively. Its internal oscillator does not require external components and I2c bus interface logic is compatible with SMBus.

The PCA9550 LED blinker drives LEDs in I2C-bus and SMBus applications where it is necessary to limit bus traffic or free up the I2C Master’s (MCU, MPU, DSP chip set, etc.) timer. The uniqueness of this device is the internal oscillator with two programmable blink rates. This LED blinker requires only the initial set-up command to program BLINK RATE 1 and BLINK RATE 2 (i.e., the frequency and duty cycle). From then on, only one command from the bus master is required to turn each individual open-drain output ON, OFF, or to cycle at BLINK RATE 1 or BLINK RATE 2. Maximum output sink current is 25 mA per bit and 50 mA per package. Any bits not used for controlling the LEDs can be used for General Purpose I/O (GPIO) expansion. The active LOW hardware reset pin (RESET) and Power-On Reset (POR) initializes the register to their default state, all zeroes, causing the bits to be set HIGH (LED OFF). One hardware address pin on the PCA9550 allows two devices to operate on the same bus.

LED drivers can enable dimming and color changing or sequencing of LEDs initiated by preset commands, occupant presence, or manual commands. Most LED drivers are compatible with commercially available 0V to 10V control devices and systems like occupancy sensors, photocells, remote controls, architectural and theatrical controls, and building and lighting automation systems.

PCA9550 LED Driver With Programmable Blink Rates – [Link]

Controlling servo motor using IR remote control

by mohamed soliman @ instructables.com:

If you are looking for comfort and controlling your electronic devices remotely, you will find your need in this instructable.

In this instructable we will learn how to control a servo motor with remote control, this will give you a general concept on how to control remotely. You should know that the remote control sends Infrared(IR) signals, so we will learn how to receive and read these signals using Arduino.

Controlling servo motor using IR remote control – [Link]

The Simple Scalar Network Analyzer

ddstop

by rheslip.blogspot.com:

After playing around with the SynthNV signal generator/power detector discussed in the previous post I realized what a useful a tool it is for RF testing. While its a terrific tool for VHF/UHF/Microwave testing, the SynthNV has a couple of serious limitations for amateur use in the HF region – the signal generator has a minimum frequency of 35 MHz, the generated signal has a lot of harmonics and its a fairly expensive piece of gear. This project is a fairly simple, very low cost Scalar Network Analyzer that does the same thing in the HF bands from 1MHz to 30MHz. If you buy the parts from China or Ebay and do some scrounging it should cost you less than $20 to build.

The Simple Scalar Network Analyzer – [Link]