[arm-allstar] Fan control via GPIO and control circuit you can get from Amazon

[Kevin Custer]

On 10/27/2018 11:15 AM, "Doug Crompton via ARM-allstar" wrote:
> More sophisticated would be to key the fan on and off with PTT or a GPIO bit that follows PTT.

The Masters Communications RA-42 is an inexpensive radio adapter that 
affords a open-collector NPN transistor buffer following GPIO 4 or 8.  
While originally intended to interface with TX CTCSS control, the output 
can be used generically to control what ever - even a fan directly.  
This might allow for a cleaner installation and possibly not be any more 
expensive, all things considered.

Kevin W3KKC
Owner of Masters Communications