Hobby Projects - Insulation tester, LED Circuits, Meters.

Tuesday, April 17, 2018

Kicad EDA - Design a Product

Kicad is an open source (GPL) software for the creation of electronic schematic diagrams and printed circuit board artwork.

KiCad EDA Software Suite

Designed and written by Jean-Pierre Charras, a researcher at LIS (Laboratoire des Images et des Signaux) and a teacher in IUT de Saint Martin d'Hères.(France), in the field of electrical engineering and image processing.

KiCad Schematic

The electrical rules check (ERC) automatically verifies your schematic connections. It checks for output pin conflicts, missing drivers and unconnected pins.

KiCad comes bundled with a vast library of symbols, footprints, and matching 3D models. They are community maintained so they never stop improving.

Make professional PCB layouts with up to 32 copper layers. This modern tool will help you lay out your board faster. As you draw your track, it pushes forward traces that are in the way. If that is not possible, your track will be rerouted around obstacles.

KiCad PCB

KiCad consists of ..
  • kicad - the project manager
  • eeschema - the schematic editor.
  • cvpcb - the footprint selector for components used in the circuit design.
  • pcbnew - the PCB layout program.
  • gerbview - the Gerber (photoplotter documents) viewer

Monday, April 16, 2018

Simple Water operated relay

This was done in my early days, i have upgraded it, it ought to work, reduce the number of transistors to make it less sensitive, also a lower value in place of 10M will reduce its sensitivity, use clamping diodes to protect.

BD139 is used to drive the relay as it has good Ic. So you can even use a low ohm relay. If a Relay resistance is high its quality is higher, its power consumption is less and it needs thinner wire SWG-AWG.

Simple Water operated relay

See more at Circuits with Discrete devices

T2 and T3 form a darlington pair which drives T1. LED1 shows that the water level has reached the top of tank and also that the Relay is energised. D1 a freewheeling diode. R3 10M ensures that the high gain input does not float, yet the low leakage current thru the water is not drawn away by the 10M. R2 limits base current in case water is saline.

Thursday, April 12, 2018

Embedded Systems Made Easy - StickOS

StickOS BASIC is intended to make embedded systems technology and advanced microcontroller functionality quickly and easily accessible to High School students, hobbyists, and researchers, etc., Wayback Copy. (closed domain)

Interfacing with digital circuitry, analog circuitry, serial circuitry (UART and SPI), servo motors, and buzzers, etc., all become trivial single-line, single-minute tasks in StickOS BASIC, so the user can concentrate on achieving the control task at hand, rather than the detailed mechanics of control."

Embedded Systems Made Easy - StickOS - Rich Testardi (mail) 2009

"StickOS BASIC is an entirely MCU-resident interactive programming environment, which includes an easy-to-use editor, transparent line-by-line compiler, interactive debugger, performance profiler, and flash filesystem, all controlled thru an interactive command-line user interface....

CPUStick is a 1"x4" very low cost standalone USB embedded computer based on the Freescale MCF52252 ColdFire MCU and MC13201 ZigFlea Wireless Transceiver,..."

StickOS Examples - A simple embedded system, like a toaster oven temperature profile controller, can be brought online in record time!

LCD Digital Thermometer

LCD Digital Thermometer - With the advent of advanced serial peripherals based on the I2C or QSPI serial interfaces, embedded systems can take on a whole new level of real-world functionality!  An LCD digital thermometer, displaying both Celsius and Fahrenheit, can be brought online in minutes, with just a quick study of the I2C peripheral register or protocol definitions!

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