Crane's Never ending Brewery Upgrades

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crane

crane

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Here are the specs for the circuit board. All the options are based off of what components are soldered to the board. Its not reconfigurable without soldering.

1. Wiznet W5500 SPI Ethernet based off of Arduino Ethernet Shield 2
2. All analog inputs can be configured for 0-5V, 4-20mA, or thermistor temperature sensors (C55, C56 and FB4 create a filter to remove digital noise for the thermistor circuits)
2. Each analog input has an adjacent ground terminal. This allows you to bring the cable shielding all the way up to the screw terminal.
3. Removed unnecessary connections from the screw terminals. Sans Power, extra grounds, Aref, Iref and unusable pins 10, 20, 21 and 50+. All usable IO from a BruControl perspective are coming out to a screw terminal except pin 43.
4. All digital in/out support:
a. Direct connection from the mega to screw terminal
b. PTC fuse to protect IO from overvoltage
c. Pullup or Pulldown resistors for switches
d. Open drain N-FET outputs with higher current than mega IO
i. will be used for 16 channel relay boards that require 25mA per input
j. Grand Central 3.3V outputs can be converted to 5V
5. Outputs 41 - 43 are used for my element time sharing circuit. Output 43 is used to change what element output (41 or 42) has priority over the other.
6. 150x72mm to fit in this DIN Mount Carrier.


mega-shield-V1_3d_done.png
 
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crane

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There is a mix of 0603 and 0402 for the resistors and capaitors. It's all configured through stuff options for what components get soldered down. No jumpers or dip switches for configurability. I will be using 3 of these in my control panels and all 3 will be configured differently.
 

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Would you mind sharing the spec of the pressure sensors you're using? I'm looking to use them for measuring water/wort levels.

thanks.
 
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crane

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Built up the V1.1 boards yesterday. Along with the PCBs I bought the solder paste stencil. I placed all the parts with tweezers under the microscope and used a hot air gun with the air flow set to minimum to reflow the solder paste.

Start by taping the PCB to the lab bench.
PXL_20210424_172448728.jpg



Here is a picture of the solder paste stencil.
PXL_20210424_173856914.jpg


Line up the stencil over the PCB and tape it down as well.
PXL_20210424_172657270.jpg


Bought the solder paste off of Amazon
PXL_20210424_172734135.jpg


cover the stencil with solder paste. Used a credit card to smooth the solder paste into the stencil.
PXL_20210403_171040252.jpg


Picture of the board after solder paste was applied. Ready to place components and reflow the solder paste.
PXL_20210424_173242837.jpg



Here is the solder station I used at work for this.
PXL_20210424_173456430.jpg


Here is a fully assembled board installed in the control panel.
PXL_20210424_225047960.jpg


PXL_20210424_225217667.jpg
 

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mkosonen

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Out of curiosity, what kind of work do you do for a living? Looks amazing! Great job, and nice writeup as always.
 
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crane

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Out of curiosity, what kind of work do you do for a living? Looks amazing! Great job, and nice writeup as always.
I'm an electrical engineer. I design large circuit boards for large compute systems. Each one of the systems costs ~$500K to make. They are used for prototyping/emulating cell phone processors prior to making the actual chip.
 
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Last thing to do before mounting the control panels. My wife is hand painting the lettering for each connector. She's got some mad artistic talent. You can check out her cake decorating skills at sugarlacedcakes on instagram.

IMG_20210504_174636_977.jpg
 
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crane

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Here is the control box for the grain mill scale. I added a relay to turn on/off the mill. I plan to use a script to turn the mill off after it mills a buckets worth of grain. I will then swap out buckets and then continue milling the rest of the grain.

PXL_20210520_012609351.jpg
PXL_20210520_012604387.jpg
PXL_20210519_234224597.jpg
PXL_20210519_234237378.jpg
PXL_20210520_012114797.jpg
 
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