Circuits & Schematics - Automation - 4

Systems for industrial and home automation, data-loggers.

31. Photovoltaic switch disables unused LEDs
    Circuits Automation Texas Instruments OPT101
    Lance McBride EDN In many applications, it's desirable to disable LEDs used for system verification. Many options are available for the disabling function, including manual SPST (single-pole single-throw) switches, enhancement- and ...
    Dec 5, 2017
32. Controller for automatic lighting of the working area in the kitchen. Part 2 - NodeMCU Version. Schematic, PCB, Sketch
    Circuits Automation Wireless Microcontrollers Usage Light Arduino
    Part 1 - Arduino Version. Schematic, Sketch and PCB General information Schematic diagram Printed Circuit Board (PCB) Arduino Sketch Highlights Conclusion Downloads References General information The second version of the controller is made on a ...
    Jun 14, 2017

33. Controller for automatic lighting of the working area in the kitchen. Part 1 - Arduino Version. Schematic, Sketch and PCB
    Circuits Automation Wireless Microcontrollers Usage Light Arduino
    General information In this article we will talk about a simple device that I designed for automatic control of additional LED lighting in the kitchen. Kitchen renovating and complete replacement of kitchen cabinetry are main reasons for ...
    Mar 15, 2017
34. «Magic» Cat Doorbell
    Circuits Automation Microcontrollers Usage Vishay TSSP4P38 IRLD024 VSLB3940
    Andreas Freiherr VishayOpto Creating a “Magic” Cat Doorbell with the TSSP4P38 Proximity Sensor Leonie and her family live in a building with seven other families. Like many cats, Leonie loves to explore her surroundings, and after ...
    Jan 18, 2017
35. Portable temperature, humidity and light ambient datalogger. Part 1
    Circuits Automation Microcontrollers Usage PIC18F2620
    Part 1 - Hardware: Schematic, PCB and case. Hi all! I’m continuing here with the last board I design and now I’m continuing testing. It’s a battery-powered small datalogger based on a PIC18F2620 microcontroller (Figure 1). The ...
    Sep 14, 2016
36. Doorbell transformer acts as simple water-leak detector
    Circuits Automation Security
    Jeff Tregre EDN Shortly after installation, the simple water-leak-detector circuit in this Design Idea saved the day and hundreds of dollars. The average life expectancy of a hot-water heater is about 10 years. It’s not a question of whether ...
    Jun 23, 2016
37. Digitally programmable resistor serves as test load
    Francesc Casanellas
    Circuits Automation Measurement
    Figure 1 illustrates a digitally programmable precision resistance that can serve as a microprocessor-driven power-supply load in custom-designed ATE (automatic-test equipment). An 8-bit current-output DAC, IC 1 , a DAC08 , drives ...
    Jun 9, 2016
38. Reflective object sensor works in bright areas
    Circuits Automation 74HC393 74HC175 OPB704
    Vladimir Rentyuk EDN When using a reflective object sensor, counting and identifying objects is sometimes difficult in the presence of electrical noise or bright ambient light. The circuit in Figure 1 shows an inexpensive solution to this problem ...
    Jan 12, 2016
39. Soldering iron driver bridge controls temperature
    Circuits Automation Tools and Technologies Power
    Kiril Karagiozov EDN One way you can control the temperature of a soldering iron is with a microcontroller, using temperature feedback from the thermistor in the handle near the iron's tip. This Design Idea presents a soldering iron driver that ...
    Jan 2, 2015
40. Bipolar 20 mA current-loop driver for robotic valves and other applications
    Circuits Automation Power
    Clive Bolton EDN This Design Idea drives the 20mA current loops that are often used to control two-way proportional pneumatic or hydraulic servo valves in high power robotics applications. Most current drivers are capable of driving unipolar ...
    Oct 22, 2014