Hobby Projects - Insulation tester, LED Circuits, Meters.

Saturday, October 21, 2017

Simple Cheap Dark-Detecting LED Circuit

Here's a simple problem: "How do you make an LED turn on when it gets dark?"  EMS Labs.

Simple Cheap Dark-Detecting LED Circuit

When light falls on the phototransistor, it begins to conduct up to about 1.5 mA, which pulls down the voltage at the lower side of the resistor by 1.5 V, turning off the transistor, which turns off the LED......

Simple Cheap Dark-Detecting LED Circuit

Parts -On top: a CR2032 lithium coin cell (3 V). On the bottom (L-R): the LED, an LTR-4206E phototransistor, a 2N3904 transistor, and a 1 k resistor. This LED is red, blindingly bright at 60 candela, in a 10 mm package. It casts a visible beam, visible for about twenty feet in a well-lit room.

Friday, October 06, 2017

Vicacopter – Open Flight Robotics

Source code and many notes used in Vicacopter, the 1st English language source code for a fully functional helicopter autopilot.

Vicacopter - Open Flight Robotics

Vicacopter uses a ground computer for flight control. An 8 bit airborne microcontroller handles rate damping, PWM, & sensor capturing. The ground computer handles navigation & provides a simple instrument panel. This was the cheapest & most flexible way to fly. The system can be converted to a completely airborne autopilot very simply.

Vicacopter - Open Flight Robotics

Some Features
  • Automated landing & takeoff
  • Sonar position sensing for indoor flight
  • GPS position sensing for outdoor flight
  • Ground station instrument panel
  • Untethered communication from pilot to ground station
  • Curved or linear paths

The Tri-Roter one used 3 gyros for short term rotation sensing, 2 accelerometers for long term tilt sensing, 3 magnetometers for long term heading sensing, a high quality GPS module for horizontal position, a barometer for altitude sensing. A 3rd accelerometer was too sensitive to vibration & altitude changes to be any good. Because of the long term sensors & the very stable gyros, the orientation was always pretty accurate & didn't drift.

Thursday, October 05, 2017

RobotProg - Learn Bot Programming

Program a virtual robot with a flowchart : first you draw the flowchart, then you run the program and watch the robot executing your program. You do not have to own a Robot to start with.

RobotProg - Learn Bot Programming

With RobotProg you can learn programming bases by means of gradual levels. At the last level, you may program several robots playing games on the same ground.

RobotProg - Learn Bot Programming

See also Solve Elec

Draw and analyze electrical circuits functioning in direct or alternating current. Get literal formulas and values for current intensities and voltages defined in the circuit. Verify circuit related equations.


"Not all bots like to be told what to do, Then these are Instructed Bots. Some Bots later Evolve or Mutate into Fuzzy Bots. Then they will take their own Decisions." - delabs

Saturday, September 09, 2017

Learn thru Hobby Electronics

hobby-electronics.info information site electronics hobby. For beginners or learners taking an electronics course! would be a fun way to start. Electronics Projects page has some projects with a PCB layout for easy building too.

Learn thru Hobby Electronics

Learn thru Hobby Electronics

The Course - "We start with a few lessons about voltage, current en resistance. Next, we'll discuss power dissipation and capacitors, diodes and transistors. We now have enough knowlegdge to build a simple power supply. And after a few lessons about differential amplifiers and operational amplifiers, we are even able to design and build a professional lab power supply."