by Michael Whybray:
Most desk fans I have come across have three speeds: Full Speed, Almost Full Speed, and Off – useless if you want just a gentle air movement, and far too noisy if you are trying to get to sleep (in your bedroom of course, not at your work desk!). The squirrel cage induction motors they use have switches to two or more windings – and possibly a capacitor – to reduce the drive current. But unless the drive frequency is also reduced, the torque and speed stability are poor, so minimal speed reduction is usually available on these fans. Using a triac to provide phase control of the voltage works poorly for the same reason, with the speed very sensitive to the triac firing phase angle and fan load, and has a tendency to stall.
Sleep easy with this desk fan speed reducer - [Link]
This project provides some lighting effect by the blinking pattern of the bulbs connected at its output. Up to 8 Bulbs can be connected in between connector CN2 to CN9 and AC power to control them should be connected at Connector CN10. DC Power should be applied at Connector CN11 in accordance with the polarity marked on this connector. Care should be taken while using this it as it contains Main Power on the board.
Microcontroller based running light controller - [Link]
Before I began the installation of my Yaesu FT-8800 in my car I knew I wanted automatic power ON / OFF. This is a feature that I have always felt was lacking in my other mobile rigs as I am forever leaving my ham radio on long after I have departed the car.
Let’s start with an action packed video of the finished product, then we can talk about how we got there.
Mobile Radio Power Controller ( MRPC ) - [Link]
A four-channel remote control built using the EnOcean Pi by Kerry Wong:
In my last couple of blog posts, I did a brief overview of the EnOcean Pi sensor kit from Newark and demonstrated how to compile and run the example code using a Raspberry Pi. In this blog post, I will show a real world example – a four-channel remote control built using the EnOcean Pi in conjunction with the EnOcean pushbutton module.
A four channel remote control using EnOcean Pi - [Link]
Power Pic RGB with Infrared remote control is a circuit that generates many colors using a RGB LED and fades between them.
The concept comes from Pic RGB project  where the goal was to develop a fading algorithm between different colors, randomly generated.
Being its third evolution, this time the goal is to use a remote control to change the colors, either by choosing a specific color or by selecting an automatic color fading mode, in which the software will keep changing colors over the color spectrum!
PIC RGB Power board with Infrared remote control - [Link]
This project described a stereo audio amplifier using two LM386 ICs and a PIC microcontroller to control the volume of the two output speakers. The project uses a DS1868 digital potentiometer that creates a voltage divider network at the input stage of LM386 to control the fraction of signal fed to the amplifier. The potentiometer wiper position is varied digitally by the microcontroller based on the user inputs.
Digital volume control for a stereo audio amplifier – [Link]
This month, Shawn Blaszak, at Pumping Station: One, shows how to convert a standard TV remote control to solar power. Leave your remote sitting on a sunny windowsill and let it top off the charge in your batteries while you are away from the TV. [via]
Solar Powered Remote Control – [Link]
Steve Lodefink shows us this awesome World Control Panel he built with his son. [via]
My son Harlan and his friend love to play “agents” and he asked me if we coud build “a panel that has a bunch of switches that turn on some random lights”. We worked on it for about 3 weeks, and this is what we came up with. The panel boasts the following features:
World Control Panel – [Link]
I got a friend who works for small start-up in a rented office. His problem is that they have only a single remote control to operate the parking lot gate. They needed a device that will allow them to open the gate by using the cell phone.
I built a device that connects to a phone line and to a standard remote control. The device is actually a “docking station” for the remote control. When a ring is detected the device will “press” the gate-open button on the remote control.
Telephone Operated Car-Parking Remote-Control – [Link]
Allows to remotely manage the heating or cooling of any room. It can also notify, via SMS or phone call, when the sensed temperature falls out the set limit value or the alarm input is active.
All commands related to the control and settings of the device are sent via SMS.
There are three operating modes: forced (M), automatic (A) and enslaved (T); those modes can be set with a SMS or with a local button.
To fully integrate the device with the existing system, our unit can also work as a remote alarm: it has an opto-isolated input at tension level that can be connected to the boiler malfunction indicator and set to be adapted to the different functioning conditions (in order to send an alarm if it receives tension over the threshold or if it is at zero volts); in this way, if the system gets blocked (due to an obstruction in the chimney, the excessive lowering of fluid pressure in the radiators, lack of gas, etc.), the system remotely communicates the fault with an alarm SMS or a phone call.
The alarm on the opto-isolated input is valid only when the circuit is working in automatic mode (A).
That’s not all: there is also a thermal alarm that goes off when the sensed temperature in the room exceeds the limit set by the user, that is it exceeds the maximum threshold or goes below the minimum one; the same as for the one connected to the boiler indicator, the thermal alarm can determine the sending of SMS or phone calls. The circuit can store up to eight phone numbers to which send the alarms as SMSs or simple calls.
GSM Remote Control – Temperature Control - [Link]