HC-SR04 Ultrasonic Sensor Distance Measuring Module from czb6721960 shop on eBay $1.58 USD. item #140717531874        

  100 3mm Blue Lens LED from czb6721960 shop on eBay $2.82 USD. item #140935550658           Comparison of 5mm and 3mm Light Emitting Diodes.    

  100 5mm Blue Lens Thru Hole LEDs from czb6721960 shop on eBay for $3.30 USD. item #160992146984   Comparison of 5mm and 3mm Light Emitting Diodes.            

  I purchased these push button switches from czb6721960 shop on eBay.   50 blue and white 8mm x 8mm locking square buttons $2.63 item #160994703230           100 black 6mm x 6mm x 5mm 4-pin DIP push button switches $1.59 item #140942027356       And a view of the two switches side by side   […]

  Light Emitting Diodes from Any Circuit’s store on ebay   200x Red LED 5×2.5mm Diffused, Red BR5379K DE2584 (310725335279) $3.96   These tombstone shaped LEDs have the positive lead as short and the negative lead as long. This is reversed from the standard markings and therefore makes this product difficult to teach with.   This LED can also be […]

  Breadboard prototype test for Five LEDs with Atmel ATtiny45 microcontroller programmed with Arduino to slowly blink out of sequence. Blink Order is: led3, led1, led5, led4, led2     Video can be found on The eTextile Lounge youTube channel. Binary sketch size: 1,014 bytes (of a 4,096 byte maximum) Error Message – IGNORE avrdude: please define PAGEL and BS2 […]

  Way back in 2011 I used CUPro conductive paint to test different application methods for circuit boards and LEDs. Thanks to my impeccable filing system I just found the sample papers and the paint.     GOOD NEWS – the paint is still is working as a conductive trace! In fact even after three years the resistance remains the […]

  A no-sew conductive trace can be assembled by using Flat Flexible Connectors (FFC) and a conductive ribbon. Simple. Durable. Cost effective.   This conductive ribbon is from Fabrick in 100+ yard orders and has three conductive traces woven into the ribbon.   The FFC is available from DigiKey: Male 609-2178-ND Female 609-2160-ND   Please note that in this example […]

  I use 3V coin cell batteries in many of my eTextile and paper computing projects. They’re small, easy to use, and effectively power multiple LEDs. In general the negative terminal is the underside, unmarked, and has a dotted textured surface. While the positive side will be marked with a + symbol. These CR2032, as with the design of most […]