Low current draw on standby mode

October 28, 2015 in 8 Channel PDU by Joshua Oster-Morris

The next generation Motobrain hardware will draw 6.4mA in standby mode. It does not scan it’s inputs for triggers in this mode. It only waits for the key signal to turn on or the Bluetooth to connect.

How it works in practice is that when the key signal is off and no outputs are on we turn off all non essential hardware and slow the main clock chip way down. then every 8 seconds we turn it back on and look for a Bluetooth connection request. If we see one, we turn the device back on and continue where we left off.

The image below shows the current draw over time where one mV equals one mA. My integration of those values gave a weighted average of 6.4mA.

Motobrain with CANBus and automotive connector

October 19, 2015 in 8 Channel PDU by Joshua Oster-Morris

The first prototype of the new Motobrain with CANBus and automotive connector just came out of the mold. She is looking good and works well!


What it takes to build a Motobrain

October 1, 2015 in 8 Channel PDU by Joshua Oster-Morris

Building just the smart half of Motobrain, what I call the “brain board”, requires 220 surface mounted components (40 different types) with 900 individual solder joints. I will manually place all the parts on the PCB and then “reflow solder” them to the PCB. It is an arduous task to be sure. Conveniently, I believe the next one I build next will be the last one I have to build. If this new PCB works as expected, I expect the rest to be manufactured by robots. Let’s hope it works out! The one below had a PCB manufacturing error which required me to install a “bodge wire”. Can you find it?


In the photo below you can see all the parts counted and taped to two sheets of paper. There is also a built brain board (in purple), a pile of new green unassembled brain boards, and two different “power boards” and piles of their unassembled PCBs. The different power boards define the alternative product features and shape but both use the same brain board.

Motobrain Parts