Paul In The Lab. How to Create PCB in CNC From JPG.
Programmable LED. An LED is used as output.
As input I used an LDR, a light dependent resistor. This LDR changes its resistor as it receives more or less light. The resistor is then used as analog input to the microprocessors ADC (analog digital converter). The controller has two modes of operation, one for recording a sequence, the other for playing back the recorded sequence. Once the controller notices two changes of brightness within half of a second, (dark, bright, dark or the other way round), it switches to recording mode. Seven Sided Dual Rotating Mame Cabaret. Workshop - Forrest Puzzlers. Make a Jacobs ladder. I remember when I was a very bored kid at secondary school, I discovered a book in the school library called "The Boy Electrician".
The book was very old and seemed to assume that it was perfectly acceptable for kids to build their own X-ray machines and mess about with other extremely dangerous apparatus. One of the interesting bits was about a spark coil with a vibrating reed switch that could generate extremely high voltages when powered and could be used to drive such delights as Geissler tubes (early neon tubes), the afore mentioned X-ray unit and various other dangerous devices including a mini Jacob's ladder.
At the time it wasn't too practical to build the spark coil due to it's requirement for seemingly outdated and hard to obtain materials (A pound of soft iron wire and a Geissler tube please), but later on when I had left school and started as an apprentice electrician I started to get my hands on all sorts of dubious technical stuff. AX500 - Low Power, 2 x 15A Brushed DC Motor Controller - roboteq.com. Data Acquisition Systems (DAQ) and Equipment.
LED Calculator - Current limiting resistor calculator for LED arrays. Things to make and do.