HM 4.0 blower connections


 
T

TBattle

New member
So, I soldered up a working HM4.0 yesterday. Works great. Did not see instructions on where to solder the + & - for the blower. Saw one picture, and its the 3 prong to the left of the botton next to the image of the BBQ pins 1&2 from the bottom. Looks like pin 3 is for the servo. This correct?
 
The HMv4.0 used an RCA jack to connect the blower, tip positive, ring ground. If you want to use a servo you need to piggy back solder wires to your board for ground, +5v and pin 14 on the ATMega for the servo signal. Since the whole concept of the servo damper hadn't been thought of when the HMv4.0 was designed there is no indication on the schematic of the pinout, but the HMv4.1 schematic shows it on the ATMega (and has the servo output on the CAT5 jack as well), but the HMv4.0 will support the servo if you solder in the wires and run the software that has the servo support built in....
 
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