0

Capacitive Touch Sensing with Bare Conductive

musicalfish

Electric Paint on Macetech:

This is a short article demonstrating an experiment with Bare conductive ink and the MSP430’s capacitive sensing hardware.

I’ve experimented with various capacitive sense methods previously; the most common uses one pin to charge up an electrode, while using another pin to measure the amount of time needed to charge up to the logic high threshold level of an input pin. A couple of similar approaches are illustrated here: http://www.ti.com/lit/an/slaa363a/slaa363a.pdf

An alternate method is available on several of the MSP430 value line microcontrollers (G2xx2, G2xx3, FR58xx, FR59xx). In addition to the typical pin peripheral functions, they include a relaxation oscillator circuit that includes pin capacitance to set the frequency. By measuring the number of oscillations in a given time period, a small change in capacitance can be measured…enough to detect whether a finger is touching an electrode.


Bare Conductive Paint Pen – 10mL – Bare Conductive Paint is a multipurpose electrically conductive material perfect for all of your DIY projects! Bare Paint is water based, nontoxic and dries at room temperature.

Bare Paint is the first non-toxic electrically conductive paint available to consumers today. This unique child-friendly material is designed for people of all ages to explore and learn about electronics with an inclusive, easy-to-use material.

Bare Paint provides a dramatically different method of interacting with electronics as it can be applied to almost any surface, including cardboard, paper, wood, wallpaper, walls, textiles, and some plastics.

Bare paint can be used to replace conventional acid etching, making it a great electronics prototyping tool. Nontoxic and water-soluble, Bare Paint can be used without gloves or mask. The paint dries quickly at room temperature, and can be removed with soap and water. This means it’s also not water-proof or weather-resistant!

Application Methods Include: painting, screen printing & spray painting among others. Despite being called “Bare” conductive, it’s meant not for use on bare skin.


Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 8,500+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython – Python on Microcontrollers is here!

Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


Maker Business — Rethink Robotics closes shop. Long live collaborative robots #makerbusiness

Wearables — Cleaning is key

Electronics — Serial overkill

Biohacking — Biohacking Resources – Books, Talks and Podcasts

Python for Microcontrollers — CircuitPython @ Hackaday SuperCon #ICYMI @circuitpython @micropython @ThePSF #Python

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.