T-Shield V2.0
Flexible circuitry for wearable & physical computing prototypes
zohar messeca-fara | yair reshef
T-shield V2.0 Development is a Continuation of T-Shield V1.0 Research.
We Have Decided To Add A Wireless RF Communication Capability To The New T-Shield Version
And Also Needed A Better Interface For Uploading Code and Debugging then We Had in Early T-Shield Version With The Pro Mini MCU .
We Decided To Use Arduino Nano Board Instead Its Cheap And Relatively Small with A Mini USB Socket.
And Also Based on ATMEL328 Chip (which is Equivalent To Arduino UNO Specifications).
Features:
– Flexible PCB (Pyralux)
– Wireless RF Communication Based on NRF24L SMD Module.
– 4 MOSFET Channels 3A Max. With PWM Control and additional Circuit incl. Diode/Drop Down Resistor.
– Easy Connection To Computer Uploading Code and Debugging
– Flat And Compact Design.
Nano (Full GPIO) / NanoRF (Wirless)
Early Attempts
Copper Tape Stencil Cutting Process with Silhouette CAMEO A3 stencil cutter.
Photolithography Process Using Photoresist Dry Film (AliExpress) & Pyralux
UV Exposure – we dident have a propper UV box back then so we exposed the circuit to sun light for 30sec (israel).
Removing UnExposed Photoresist Dry Film – Soudium Carbonate 2g:200ml water Solution
Etching Using Ferric Chloride
ferric 1:1 water (50°C)
Removing Photoresist Dry Film From Traces – Sodium Hidroxyde solution or scrub the board with steel wool and acetone.
sodium hidroxyde 2g : 100ml water
