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Adafruit BTTF Time Circuit Case

by stefi01 Aug 22, 2015
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If you dont mind I will use more than 3 red displays...... I dont have any other colors


Not sure where you got stuck in the electronics build. But it's important that you use the i2c enabled displays from here https://www.adafruit.com/product/880. You can't use ordinary 7-segment displays.
If you never used the i2c protocol, then that may be why you get confused about how the electronics work.
For the circuit to work you only need to use four I/O pins on the Arduino.
Two for i2c ( SDA and SCL ) and two pins to select the row. What pins are used for SDA and SCL is between different Arduino models.

What's missing in the description is also how you set the i2c address for each display.
For the first column ( address 0x70 ) you don't need to change any address.
For the second column you need to change i2c address to 0x71 by bridging A0
For the third column you need to change i2c address to 0x72 by bridging A1

The thing that is hidden behind the blue tape is probably the 74HC138. The green board is the Teensy. The round board to the right looks like a RTC ( Real time clock ).https://www.adafruit.com/product/255
It's not in the schema but can also be connected to the same i2c ( SDA / SCL ) lines since it uses a different address 0x68.

Hope this helps.


Wow! My next little project! Thank you

no its not needed as the box thing i put on here is that thing, just redesigned abit, the displays just slot, well more like get sholved in to the holes as tight squeeze but it does holder the displays nicely, its tall enougth so a teensy or arduino will fit, the battery box will need some form of metal ends though, i did not design that bit, kinda nicked it from here http://www.thingiverse.com/thing:941081 and squished it in. and the design of it all split down and any one is welcome to improve it can be found here https://tinkercad.com/things/3nT75ycuwrK
its a shame that i have no clue on the electronics side, i know arduino and use it lots but teensy leaves me behind and theres half a circuit missing on the adafruit link.

Flexing battery holders with 2- and 3-cell compartments
by enif

nice going make one but the black thing on hole the screen in https://blog.adafruit.com/wp-content/uploads/2012/06/Grid.jpg that some i download or is the come with the screen

just now i am look this film