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14 Comments

Secret knock detector with 555

  By electrobob February 28, 2011 February 8, 2017 Projects

Detecting a secret knock pattern using 555’s. Continue reading

Tagged   555, 555contest.com, breadboard, circuit, detector, door, entry, knoc, led, microphone, relay, reset, secret, timer, transistor
9 Comments

555 / 556 H bridge

  By electrobob February 22, 2011 February 8, 2017 Ideas and Articles, Projects

Simple H-bridge using 555’s. Continue reading

Tagged   555, 555contest.com, 556, bridge, cheap, contest, diode, h-bridge, hbridge, low, microcontroller, motor, power, pwm, simple, timer, zener
35 Comments

EGO BOX

  By electrobob January 15, 2011 February 8, 2017 Projects

A physical display that connects to the internet to display the visits counter on my website. Continue reading

Tagged   7, access, box, count, counter, display, ego, enc28j60, ethernet, hits, internet, php, physical, script, segment, seven, stack, tcp/ip, view, visits, wordpress
29 Comments

Toner transfer to ABS

  By electrobob December 3, 2010 February 8, 2017 Ideas and Articles, Utils

Yes, apparently you can transfer toner to ABS to make nice project boxes. Continue reading

Tagged   abs, aluminum, box, enclosure, front, frontpanel, frontplate, heat, iron, iron on, panel, pcb, plastic, toner, transfer
42 Comments

LED UV exposure box part 2, the timer

  By electrobob September 29, 2010 February 8, 2017 Projects

Buiding a timer for a PCB UV exposure box. Continue reading

Tagged   7 segment, attiny2313, box, button, countdown, exposure, led, timer, UV
2 Comments

USB tree

  By electrobob September 4, 2010 February 8, 2017 Utils

A nice display for USB devices. Continue reading

Tagged   flash, holder, memory, modem, stick, tree, usb
47 Comments

LED UV exposure box part 1, the box

  By electrobob June 24, 2010 February 8, 2017 Projects

Building a nice UV exposure box to make PCBs. Continue reading

Tagged   box, exposure, led, leds, LM317, pcb, plexi, timer, UV, uv leds
5 Comments

RFM12B mini breakout board

  By electrobob June 22, 2010 February 8, 2017 Utils

A mini breakout board for the RFM12B radio module. Continue reading

Tagged   board, breadboard, breakout, header, Hoperf, mini board, module, radio, RFM12, RFM12B
16 Comments

CoMBi Clock

  By electrobob June 5, 2010 February 8, 2017 Projects

A binary clock that displays hours minutes and seconds using colors on LEDs. Super difficult to read! Continue reading

Tagged   binary, clock, digital, DS3232, led, microcontroller, multiplex, RGB, RTC
44 Comments

Sunrise simulator

  By electrobob April 7, 2010 February 8, 2017 Projects

A DIY sunrise simulator using a high power light, for a soft wake up during the winter time. Continue reading

Tagged   alarm, circuit, clock, dimmer, dusk, light, microcontroller, radio, schematic, sunrise, sunrise simulator, triac
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