- Sat Sep 03, 2016 1:41 pm
#54393
my DMM usually gives me false readings when the battery runs down and I ignore the indicator for too long ...
- Sat Sep 03, 2016 4:12 pm
#54399
I would advise using a board like Wemos - includes a regulator & Usb connection, and you can find it for less than 4$ on aliexpress...
- Sat Sep 03, 2016 5:45 pm
#54409
I used WeMOS when I was developing my product and I was very impressed. But it is my impression that it does not lend itself to automated assembly and so I would have to pay a premium for the two passes of through-hole soldering for the WeMOS alone plus another pass for the SMD components, versus one pass for everything if I use the 12-F. Am I wrong about this?
vcch wrote:I would advise using a board like Wemos - includes a regulator & Usb connection, and you can find it for less than 4$ on aliexpress...
I used WeMOS when I was developing my product and I was very impressed. But it is my impression that it does not lend itself to automated assembly and so I would have to pay a premium for the two passes of through-hole soldering for the WeMOS alone plus another pass for the SMD components, versus one pass for everything if I use the 12-F. Am I wrong about this?
- Sat Sep 03, 2016 8:05 pm
#54412
You are correct.
But if you are considering making a product with the board layout you have here I suggest you have a better layout produce. What you have there is not good. There is a lot more involved in a printed circuit board layout than the net list being completed.
If you do revise the board I would suggest placing the ESP-12 so that the antenna is at the edge of the board. Keep traces and copper away from the antenna area. You are both interfering with the antenna and you are injecting noise (the rf signal) into the traces around the antenna.
If you are going to have this produced (and I am not certain that is the case) then you likely would want your boards panelized. Or the assembly house would. The company I work for has a prototype pick and place machine that is able to handle small individual boards like that but it is not our first choice.
One thing that you should include with the board is fiducial markings so the optical system has a well defined targets to calibrate on. Also see what requirements are for the solder paste stencil operation. Typically some none plated holes of a specific size are used.
If you did have through hole components that needed to be soldered then your panels would need to take into account the requirements of the machine. But as you say you don't have through hole parts this is not a concern.
But it is my impression that it does not lend itself to automated assembly and so I would have to pay a premium for the two passes of through-hole soldering for the WeMOS alone plus another pass for the SMD components, versus one pass for everything if I use the 12-F. Am I wrong about this?
You are correct.
But if you are considering making a product with the board layout you have here I suggest you have a better layout produce. What you have there is not good. There is a lot more involved in a printed circuit board layout than the net list being completed.
If you do revise the board I would suggest placing the ESP-12 so that the antenna is at the edge of the board. Keep traces and copper away from the antenna area. You are both interfering with the antenna and you are injecting noise (the rf signal) into the traces around the antenna.
If you are going to have this produced (and I am not certain that is the case) then you likely would want your boards panelized. Or the assembly house would. The company I work for has a prototype pick and place machine that is able to handle small individual boards like that but it is not our first choice.
One thing that you should include with the board is fiducial markings so the optical system has a well defined targets to calibrate on. Also see what requirements are for the solder paste stencil operation. Typically some none plated holes of a specific size are used.
If you did have through hole components that needed to be soldered then your panels would need to take into account the requirements of the machine. But as you say you don't have through hole parts this is not a concern.
