@gunrunnerjohn posted:OK, I hated to sacrifice the 10A relay, so I shuffled the parts and got it all to fit in the 1.5" x 2.0" board with the high current relay.
I did have to sacrifice the mounting holes, but since the backside has no components, double-sided foam tape works well.
1. Yeah, easy for me to say, but can you confirm (again) that you can't put the HK4100F 3A relay overlayed on the G5LE 10A relay in some fashion that you can install either on the same PCB rev? I'm physically holding both parts and looking at the first PCB rev and it sure seems like something could be done to allow either part to be installed without changing the size of the PCB.
2. If you are rev'ing the PCB, any chance you could spin all ICs so that pin 1, the square-pad, is in the same corner? Nit-picking to be sure.
3. Could you drop some holes/vias on the trimpots to allow insertion of the common/inexpensive 3362P style trimpot?
4. Separate to item 1, I thought part of the reason you went to the switcher 5V regulator was because the G5LE relay used double the coil power as the HK4100F. In your last post with the 10A relay it appears the 7805 is still there? I don't have the switcher part in hand but I suspect it might be physically larger than the 7805 and the regulator chip looks awfully close to the G5LE.
5. I realize there appears to be NO "pin 1" square-pad on the interconnect to the ultrasonic module, but any ideas on how to silkscreen something to reduce chance of hooking up backwards for the case where a 4-wire cable connects the PCB to the sensor module? That is, if the PCB and sensor module are separate, the PCB might be mounted "upside down" under the layout and hence be backwards requiring additional attention to detail. The module seems to use silkscreen lettering (Vcc Trig Echo Gnd). Alas, I have no constructive suggestions.
