History: Flexi PCB workshop in NTCRI

Source of version: 34 (current)

! Workshop introduction: Hi everyone ! We (Audrey and Zohar) will give a remote workshop on flexible PCBs and funny electronic circuits ! Shih Wei Chieh will represent us and help the participants at NTCRI if needed, as long as we are behind our webcams in different parts of the world ! {img fileId="516" thumb="box"} We will give two workshops, in which you will be able to experiment with flexible PCBs. In the first workshop you will learn how to make a [https://wiki.idiot.io/lickometer|Lick'o'meter] and in the second workshop you will create a circuit for EMF sensing. First, a PCB is a Print Circuit Board. It is used to support and electrically connects electrical or electronic components using conductive tracks and pads, these are etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate. Components are generally soldered onto the PCB to both electrically connect and mechanically fasten them to it. [https://en.wikipedia.org/wiki/Printed_circuit_board|More here, on Wikipedia] In both workshops, we will invite you to experiment with flexible PCBs through various methods: Cutting: - [https://photos.google.com/share/AF1QipPCEWKCMyltatTaUJGQHjYe4Kuu9V1krBa-S3ShSp6_0ZLmL6hzgL06vgt0wARL-A?key=SFNZcmg1anhWdzE1M0F0VkYtcHh3bDk5R2RpQTVB|assembling copper tape], - [https://www.flickr.com/photos/44763807@N05/18520754083/in/album-72157654978876956/|vinyl cutting copper tape, ] -[https://www.flickr.com/photos/44763807@N05/27214690915/in/album-72157654978876956/|vinyl cutting conductive textile], -[https://www.flickr.com/photos/44763807@N05/40285810315/in/album-72157665315705607/|laser cutting conductive textile, ] - vinyl cutting conductive tape + kapton tape + transparent film = flexible circuit Printing: - [https://www.flickr.com/photos/44763807@N05/20309835635/in/album-72157654978876956/|silk screen printing circuit with conductive ink], Etching: - [http://tribe-against-machine.org/wiki/tiki-index.php?page=laser_resistive_lithography_for_conductive_fabric_etching|Laser etching with photosensitive resin], - [https://www.flickr.com/photos/44763807@N05/albums/72157680145413933/with/33707284334/|mask + etching on conductive fabric using lard, vaseline, silicon, vinyl, UV photosensitive ink] - [https://idiot.io/projects/t-shieldv2-0/|etching flexible PCB Pyralux], To explore : - [https://en.wikipedia.org/wiki/Katazome|mask using Katazome on conductive textile + etching ] inspired from indigo dye, - mask using clay resist on conductive textile / etching (inspired from indigo dye), Yang Wei Ling & Liang Wei-Ti what do thing about it ? !! Day 1: the [https://wiki.idiot.io/lickometer|Lick'o'meter ] !!! Circuit#1 - Paper , Conductive Tapes & Fabrics Lick’O’Meter Circuit {img fileId="246" } {img fileId="247" } {img fileId="248" } 3V Coin Cell Holder from EMI Tape {img fileId="255" width="80%"}{img fileId="256" width="80%"}{img fileId="257" width="80%"}{img fileId="258" width="80%"}{img fileId="259" width="80%"} You can quickly redesign the shapes, the space between the components need to stay the same. {img fileId="292" width="10%"}{img fileId="293" width="10%"}{img fileId="296" } If you use copper tape, keep in mind that the underneath is not conductive. You need to solder pads with each others and check for the continuity with a multimeter. !!! Circuit#2 - Etching a Lick’O’Meter Circuit - Copper Tape, Conductive Fabrics, Pyralux {img fileId="260" } Photo Masks: {img fileId="261" } [https://wiki.idiot.io/_media/lickophotomask.pdf|PDF ] {img fileId="264" width="10%"} Lithography process with photosensitive dry film & Etching: {img fileId="262" width="10%"}{img fileId="263" width="10%" }{img fileId="265" width="10%" }{img fileId="266" width="10%" } Check Flexible Sticky PCB Fabrication Tutorial Link Preparing DIY Flexible copper tape clad - [https://wiki.idiot.io/flexiblestickypcbfabrication|Step 1] Applying PhotoSensitive Dry Film on Flexible Copper Clad - Step 2 Or follow the steps in this [http://www.tech-place.com/en/photosensitive-materials/23-photosensitive-film.html|Link] Developing Process with Sodium Carbonate - Step 4 !!! Circuit #3 - Vinyl cutting copper tape, conductive fabric {img fileId="267" width="10%" } Iron fusible on conductive textile. {img fileId="268" width="10%"} Use a vinyl cutter to cut the circuit, to peel it off, use duct tape. {img fileId="269" width="10%"} Iron the circuit on textile, make sure there is no fibers making contacts between the tracks. {img fileId="270" width="10%"} Use a multimeter to make sure there is no connexions. {img fileId="271" width="10%"} Roll a piece of duct tape on itself and use it to maintain your components when you tin them. {img fileId="272" width="10%"} Apply flux and tin your conductive textile. {img fileId="273" width="10%"} Use tweezers to maintain your components properly when you are soldering. {img fileId="274" width="10%"} {img fileId="275" width="10%"} {img fileId="276" width="10%"} If you are not using SMD components, you can cut and curve the legs. Tin them. {img fileId="277" width="10%"} {img fileId="278" width="10%"} Ready {img fileId="281" width="10%"} Same circuit on copper tape, kapton and transparent film. {img fileId="282" width="10%"}{img fileId="279" width="10%"} {img fileId="280" width="10%"}{img fileId="295" } !!! Circuit #4 - Sewing with conductive threads {img fileId="283" width="10%"} I use Karl Grimm copper thread. Cut it, tin it. {img fileId="285" width="10%"} Tin your components. {img fileId="286" width="10%"} A SMD resistor on copper thread. {img fileId="287" width="10%"} To create conductive pads, you can use conductive fabrics or charms. At the shop, bring your multimeter to make sure they are electrically conductive. {img fileId="288" width="10%"} Sew the circuit following the previous schematics. {img fileId="291" width="10%"} The circuit is finished. {img fileId="294" } --- __results and process from Taiwan participants:__ {img fileId="517, 518, 519, 520, 521, 522" thumb="box" width="10%"} __materials (previous list)__ # screen printing frame # conductive ink # [https://www.caplinq.com/loctite-edag-725a6s54-ec-electrically-conductive-silver-ink-725a6s54.html?filter=50522|LOCTITE EDAG 725A(6S54) E&C] # activated charcoal # carbon black # cases for molding # vinegar # hydrogen peroxide # [https://statex.de/en/shieldex-woven-fabrics/|conductive fabric] # axoloti board # bare conductive # graphene aluminum foil # attiny85 # gelatin __circuits references__ # [https://photos.app.goo.gl/Ixw8mtq1MIELq0kv2?fbclid=IwAR18fREiblfR5QxwiiQxXz6mMzQKiqgxn0t6vGEhBbP_0KzyfYQWJK-AyDA|paper circuits] # [https://www.youtube.com/watch?v=fDnqNZmCcMw&ab_channel=KeystoneScience&fbclid=IwAR2NNSanF6ONWfriMizIm_2sqwiBCcONpyqZ-eYnqwabiVrnxtLiFKQ7H90|aluminum capacitor] # [https://www.youtube.com/watch?v=dVWj4sisicM|DIY Pio tone cap] # [https://www.youtube.com/watch?v=uVS2WyRxELw&feature=youtu.be&fbclid=IwAR0hvIdvKQKSw8gzNWL928nStrDvrQjJMLGCvRhfUcQcdz0KRNQjDCGvcnk|paper sensor] # [http://tribe-against-machine.org/wiki/tiki-index.php?page=laser_resistive_lithography_for_conductive_fabric_etching|laser etching with photosensitive resin] # https://idiot.io/projects/lickometer/ # [https://www.kobakant.at/DIY/?p=7443|velostat touch pad] # [https://www.youtube.com/watch?v=rd8qGfdALeg|vinegar etching] __material list (for the november 7th, 2020)__ 由於上次實體工作坊中我們並未完成Zohar和Audrey的工作坊，所以我們將在11月6號補開這個工作坊，請告訴我們您的參加意願。由於遠端進行蝕刻工作坊有點難度，這次我們將省略蝕刻的部份，直接使用洗好的軟電路板來製作這項工藝，降低進行的難度。 Due to last time we didn't finish the last workshop with Zohar and Audrey, we are going to reopen this workshop online on the November 6th, UTC 10:00. Please let us know if you want to join it again this time. Because of the difficulty of giving etching workshop in distance, we will just send you one ready made flexible PCB for this workshop. 材料包內容 Kit contents FlexiTiny Kit Electronic Components: 1 X PCB 1 X ATtiny85 DIP (FlexiTinyBootloader) 1 X DIP-8 Socket 1 X 1K (102) 1206 SMD RESISTOR 1 X 10K (103) 1206 SMD RESISTOR 3 X 22K (223) 1206 SMD RESISTOR 2 X 1206 SMD 100nF (104) capacitors 1 X 1210 SMD LED 1 X HeadPhone Jack 3.5mm 6 Pin SMD (TRS) 1 X 5050 SMD WS2812 RGB LEDS (NeoPixel) 2 X SMD micro push-button switch 3 * 4 * 2 mm 1 X 3.7V Lipo Battery 400-500mA + usb charger / 2 X AAA battery + Battery Holder 1 X Lipo Connector XH 2.0mm Pitch Plug 1 X 3.5mm Jack cable 30cm of Karl Grimm threads Lick’O’Duino Kit Electronic Components: 1 X PCB 1 X MOSFET N-Ch DMN65D8L-7 SMD or : MMBTA13LT1G / 2N7002BKW / MMBT2222A 1 X 10K (103) 1206 SMD RESISTOR 1 X 10M (106) 1206 SMD RESISTOR 感應器 Sensors 智慧構樹紙一張 1 sheets of smart paper mulberry paper Tools (not included): Soldering station Solder ESD-15 Tweezer Masking Tape 10-20mm Laptop or phone for upload