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 !
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 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. More here, on Wikipedia
In both workshops, we will invite you to experiment with flexible PCBs through various methods:
- assembling copper tape,
- vinyl cutting copper tape,
-vinyl cutting conductive textile,
-laser cutting conductive textile,
- vinyl cutting conductive tape + kapton tape + transparent film = flexible circuit
- silk screen printing circuit with conductive ink,
To explore :
- 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 Lick'o'meter
3V Coin Cell Holder from EMI Tape
You can quickly redesign the shapes, the space between the components need to stay the same.
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.
Lithography process with photosensitive dry film & Etching:
Check Flexible Sticky PCB Fabrication Tutorial Link
Preparing DIY Flexible copper tape clad - Step 1
Applying PhotoSensitive Dry Film on Flexible Copper Clad - Step 2 Or follow the steps in this Link
Developing Process with Sodium Carbonate - Step 4
Iron fusible on conductive textile.
Use a vinyl cutter to cut the circuit, to peel it off, use duct tape.
Iron the circuit on textile, make sure there is no fibers making contacts between the tracks.
Use a multimeter to make sure there is no connexions.
Roll a piece of duct tape on itself and use it to maintain your components when you tin them.
Apply flux and tin your conductive textile.
Use tweezers to maintain your components properly when you are soldering.
If you are not using SMD components, you can cut and curve the legs. Tin them.
Same circuit on copper tape, kapton and transparent film.
I use Karl Grimm copper thread. Cut it, tin it.
Tin your components.
A SMD resistor on copper thread.
To create conductive pads, you can use conductive fabrics or charms. At the shop, bring your multimeter to make sure they are electrically conductive.
Sew the circuit following the previous schematics.
The circuit is finished.
results and process from Taiwan participants:
materials (previous list)
- screen printing frame
- conductive ink
- LOCTITE EDAG 725A(6S54) E&C
- activated charcoal
- carbon black
- cases for molding
- hydrogen peroxide
- conductive fabric
- axoloti board
- bare conductive
- graphene aluminum foil
- paper circuits
- aluminum capacitor
- DIY Pio tone cap
- paper sensor
- laser etching with photosensitive resin
- velostat touch pad
- vinegar etching
material list (for the november 7th, 2020)
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
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
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
智慧構樹紙一張 1 sheets of smart paper mulberry paper
Tools (not included):
Masking Tape 10-20mm
Laptop or phone for upload