Nothing Lasts Forever

Nothing Lasts Forever

$500.00


Nothing Lasts Forever, 2016

Glass, Aluminum, Custom PCB, E-Ink Display, AA Battery

ø30mm x 100mm

Limited Edition 999,999

 

Each device is engraved with its edition number and comes with a certificate of authenticity. 

 

Detailed breakdown of the electrical and mechanical components and their associated minimum lifecycle:

 

-The e-ink display has a working lifespan of about 50,000 hours, which translates to about 90,000,000 refreshes at 2 seconds each.

 

-While the button is not engaged, the electronic circuit shuts down completely. In order for the microchip to power down without losing count, each time it powers down, the current count is recorded to EEPROM.  EEPROM is volatile memory, so it rated to be written into at least 100,000 times for each byte. Since we’re storing 6 digits, we have the luxury of spreading the 6 digits across 4000 bytes. So a 6 digit number can comfortably be written into EEPROM 66,000,000 times.

 

-Power is only consumed while refreshing the e-ink display. With a AA battery, the device can refresh approximately 80,000 times.  The count is written into memory each time it powers down so the battery can be changed without disrupting the count.

 

-The momentary push button is rated to for a minimum of 1,000,000 cycles at 50N, which is well above the 2.5N that is required to activate the switch.

 

-This device is guaranteed to function until the counter reaches 999999. It is also guaranteed to stop functioning once the counter has reached 999999.

 

 

Bill of Materials

 

Item Price Quantity Subtotal Vendor
Borosilicate Glass Tube $17.32 1 $17.32 Pegasus
E-Ink 7 Segment Display $8.35 1 $8.35 Digikey
AA Battery Clip $0.35 2 $0.71 Digikey
Battery $0.26 1 $0.26 Amazon
Battery Sleeve $0.20 1 $0.20 IMR
Retaining Ring $0.10 1 $0.10 Smalley
M1.6 x 6 screw $0.14 1 $0.14 McMaster Carr
1.25"x1.1" Aluminum Bar Stock $1.83 2 $3.67 eBay
1"x0.6" Aluminum Bar Stock $0.30 1 $0.30 eBay
Shipping $3.10 USPS, UPS
Custom PCB + PCBA $69.25 1 $69.25 PCBNG
3D Printed Spacer $0.50 1 $0.50 CW&T
CNC Machining Time (hours) $200.00 1.6 $320.00 CW&T
Assembly and Finishing $150.00 0.5 $75.00 CW&T
Total $498.91