Jump North for Rachel

January 10, 2018

Rachel Freire is visiting us for a week of residency/collaboration, as well as presenter on our first Shoptalk discussion on “how we know what we want”.

Rachel is developing her own modular jumpsuit collection which will be released in three levels:
1) download open source patterns to make your own
2) order custom assembled version from a local maker near you
3) order a standard or bespoke version as a commission to Rachel Freire

Rachel’s Commission

We offered Rachel that she could commission a custom version of her own jumpsuit from KOBA and that the customization specialization we offer in wearable technology. Rachel decided she wanted a version of the “Northbelt” built in to her jumpsuit that would allow her to always sense where north is. Jumping triggers the north-mode on and off. When you sit still for too long the belt will start to “purr”, waking you up, encouraging you to move as a travel companion might, or relaxing you as it causes you to focus on the sensation.

Flickr set: https://www.flickr.com/photos/plusea/albums/72157691507093604

Rachel's visit


NOTES

Waistband circuit:
Jump North waistband
Jump North waistband

Motor boards and waistband layering:
Jump North waistband layeringJump North motor board

Compass
Adafruit Triple-axis Accelerometer + Magnetometer (Compass) Board

Possibly with an ATtiny84
>> https://github.com/Dronetech/Tiny_LSM303
>> http://blog.dronetech.eu/attiny85-lsm303-library/

MOSFET
“Low-side – i.e. a N-channel MOSFET is used, and the drive signal is active-high. N-channel MOSFETs generally have a lower on-resistance and therefore where there is enough drive voltage to be sure of putting the MOSFET in the saturated region it will be more efficient. Plus, N-channels are generally cheaper!”
>> https://www.precisionmicrodrives.com/application-notes/ab-001-discrete-driver-circuits-for-vibration-motors

Pull-down Resistor
“A pull up / down resistor. This is required to keep the MOSFET fully off when the active signal is not present. Since MOSFETS are charge controlled devices, without this resistor a gradual charge can build up on the gate and cause sporadic operation of the motor.”
MGSF1N02LT1G (N-Channel)

Circuit

TEENSY PINOUT:
————-
—|23 1|—
—|20 0|—
—|21/22 3/4|—
—|17/18 7/8|—
—|GND GND|—
————-

PIN –> HEADING:
1 – SOUTH/WEST
0 – WEST
3/4 – NORTH/WEST
7/8 – NORTH
17/18 – NORTH/EAST
21/22 – EAST
20 – SOUTH/EAST
23 – SOUTH

CODE:

/*
Jump North for Rachel Freire
by KOBA >> www.KOBAKANT.at/KOBA

TEENSY PINOUT:
————-
—|23 1|—
—|20 0|—
—|21/22 3/4|—
—|17/18 7/8|—
—|GND GND|—
————-

PIN –> HEADING:
1 – SOUTH/WEST
0 – WEST
3/4 – NORTH/WEST
7/8 – NORTH
17/18 – NORTH/EAST
21/22 – EAST
20 – SOUTH/EAST
23 – SOUTH
*/

// DEFINE VIBRATION MOTOR PINS
int pins[8] = {
1, 0, 3, 7, 17, 21, 20, 23
};

void setup() {
for (int i = 0; i < 8; i++) { pinMode(pins[i], OUTPUT); } } void loop() { for (int i = 0; i < 8; i++) { digitalWrite(pins[i], HIGH); delay(200); digitalWrite(pins[i], LOW); } }

Steps:
cut jumpsuit pattern which will include waistband piece
fuse fusible to copper fabric
cut copper traces (4mm wide, as long as possible)
trace circuit lines to front of outer waistband piece
fuse copper traces to outer waistband piece
add interfacing as insulation to back of outer waistband piece where motors lines jump across

Northbelt uses LSM303 module, which is also:
Triple-axis Accelerometer+Magnetometer (Compass) Board – LSM303
https://www.adafruit.com/product/1120
datasheet: https://cdn-learn.adafruit.com/downloads/pdf/lsm303-accelerometer-slash-compass-breakout.pdf

this one is more:
Adafruit 9-DOF Absolute Orientation IMU Fusion Breakout – BNO055
https://www.adafruit.com/product/2472

Sparkfun has this rather expensive compass:
https://www.sparkfun.com/products/12916

Segor:
XYZ-Magnetometer 3,3V/5V, I2C, m.HMC5883L, Honeywell
http://www.segor.de/#Q=Kompass-Modul3%252C3%252F5V&M=1


References

Northbelt
https://github.com/dps/northbelt
https://www.engadget.com/2009/02/09/haptic-compass-gives-you-sense-of-direction-not-style/

North Paw
https://sensebridge.net/projects/northpaw/



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