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qbancoffee / imac_g3_ivad_board_init

iMac G3 IVAD board initialization with an arduino
GNU Lesser General Public License v3.0
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Solid State Relay #9

Closed wickerwaka closed 3 years ago

wickerwaka commented 3 years ago

I have a question about the use of the relay on the J20 board. Is there a reason the PFW and LPIACT signals can't be pulled high/low by the microcontroller directly (high current requirements?) or was it just easier to combine those signals and the led into a single switch?

qbancoffee commented 3 years ago

Hi, While testing I was bringing those hi and lo with the micro controller and it was working well but one day it didn't work and I found that somehow the inputs on the atmega had burnt. For all I know it could have been static discharge but I decided to use a solid state relay just in case. I think the SSR is rated to 200mA which I thought would be safe upper limit.

wickerwaka commented 3 years ago

Thanks for the response. Great project!