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Finishing up the lights interface


Yay they're here!!
Incoming PCB

Mmmm they look so purdy :)

20150608_194956

Doing some continuity checks before I begin soldering and risk blowing components up

20150608_195426

Most parts are on, save the I2C resistors and the heat sinks. Time to program the microcontroller:

20150608_205209

It works!20150611_194248

Let's hook up the scope to see what our I2C signals look like.

20150611_200933

DS1Z_QuickPrint5

Holy moly they're awful with the ATMega328's built-in pullup resistors. Fortunately I left spots on the PCB to add my own. I ended up with 2.2k ohms. Nice edge transition, not too much current.

After the external pullup resistors:DS1Z_QuickPrint6

Now the hard part... running the damn wires through the walls. I'll update later on.

 

 

 

 

 
Post date: 2015-06-11 21:04:51
Post date GMT: 2015-06-12 01:04:51
Post modified date: 2015-06-11 21:04:51
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