First post..Arduino Newbie!! Horray.... First project Reef/LED Controller..anyways
"trying" to control a 12vdc 150mA fan using pin 9 PWM. PWM is feeding a 1K resistor feeding the base of a transistor (NTE 375). All is fine for anything over 250 PWM but below that the fan just stops and buzzes and looks like it wants to start but doesn't. Fan is a typical 3 wire (red/black/yellow for RPM reading that I'm not using yet) Sunon w/maglev brearing. Help..??
Just reading a temp sensor and performing the Write. As soon as I change it to 249 or lower the fan stalls.
if (tempc >= 23) analogWrite(fanPin, 255);