Clever way of starting-up relays discussed in this app note from Maxim Integrated. Link here Relays are often used as electrically controlled switches. Unlike transistors, their switch contacts are electrically isolated from the control input. On the other hand, the power dissipation in a relay coil may be unattractive for battery-operated applications. You can lower […]
Tag Archives: Relay
App note: Reduced power dissipation of relay loads
Another app note from ON Semiconductors on using PWM technique to reduce power consumed when latching mechanical relays. Link here (PDF) Integrated circuit driver circuits often use relay loads in their application. Output drivers are a source of power dissipation on the IC. Latching relays can be used to keep sustaining load current at a […]
Ethernet Relay board
Boris Landoni from Open Electronics writes about a new open source project Ethernet Relay board: The project we are introducing in this article wants on to take on that task by creating, through dedicated connections, the possibility to remotely control your entrance gate, your fish tank, the garden lights, the watering system and so on, […]
6 channel speaker selector
Dilshan Jayakody published a new build: If you are an audio enthusiast and if you have multiple audio systems and speakers, you may definitely need to have a speaker selector switch. These switches allow you to route a audio signal through a switching system and distribute it to various speakers. Using this listener can select […]
Magic Mote MSP430G2553 wireless sensor node with NRF24L01+ module
Tom from Magic Smoke writes: This is my first time designing a PCB for MSP430. I really like the NRF24L01+ booster pack but I would like something smaller to use for remote temperature sensors. With that in mind I’ve designed a 24.5 x 50 mm PCB (2 on a 5×5 cm prototype) featuring MSP430G2553 and […]
Vocoder encoder relay board
Jaanus published a new build, a vocoder encoder relay board: I designed couple of vocoder encoders. Vocoders are devices that encode sound by chopping it up by frequency bands and express each frequency band only by its amplitude. This kind of representation allows to mix all the frequency bands with each other. This have been used as a […]
ESP8266 relay board
renze shares his ESP8266 based relay-switch board in the project log forum: Functions – 2x relay output – DHT22 temperature and humidity sensor – GPIO header – On board 3.3 volt regulator Project info at RN+ site. The design files and firmware are available on GitHub.
PIR sensor
An automatic PIR sensor project by Rajkumar Sharma of Electronics Lab: Project is based on Holteks IC HT7610A, which is a CMOS LSI chip designed for use in automatic PIR lamp, flash or buzzer control. It can operate in 3-wire configuration for relay applications. In our project we have used relay instead of Traic to connect any […]
Wireless ADC to relay example
Ondřej Karas of DoItWireless writes: Sometimes, you need to measure analog signal and then switch something on or off according to the result. This short example shows, how to do it. Everything you need is DDC-SE-01 module as a sensor module and DDC-RE-01 as relay module. Of course you need DK-EVAL-04 or CK-USB-04 for both of […]
electric imp-Controlled 120VAC relay switcher
Dillon Nichols blog about his electric imp-Controlled 120Vac relay switcher build: I bought an electric imp about a year and a half ago when they were released. I loved it’s simplicity and made a few temporary projects involving it but wanted to keep it for something more advanced. After all this time, I decided it’s […]
Magic Mote thermostat and wireless temperature sensor
Tom’s another cool project the Magic Mote thermostat and wireless temperature sensor: A homemade thermostat up in the basement rafters controls the heating in my home. The smart bit is the radio frequency communication that connects it to a remote temperature sensor. So, I’m planning a home automation system based around wireless nodes (the Magic Mote […]
Relay control board on DP5031 PCB
Tom writes: Here’s a breakout board for those Songle SRD series relays that are so cheap on Ebay. It fits nicely on the Dangerous Prototypes standard PCB size DP5031. Electromechanical relays are generally employ small signals to switch much higher voltages and currents. As a result, a nice big gap is required to insulate between […]
Switch AC appliances remotely with cellular control
Ezflyr built an AC relay switch that receives commands over the cellular phone network. An ADH8066 quad-band GSM cellular module handles the communication, while a PIC18F2550 controls the relays and reads temperature sensors. The goal of this project is to remotely switch heaters on his aircraft, which requires a few hours of preheating before a […]
Network controlled relays & 3 channel PWM
A new internet controlled lighting project called SplashLight is being developed. It has 4 relays to turn lights on and off, and 3 PWM outputs to drive RGB LEDs. The core of the project is a Cortex M3 uC with an Ethernet PHY/MAC from Texas Instruments. The project includes iPhone, Android, and web applications to […]