Assembling the Kegboard

Before you Start

Double check that sure you have all the necessary parts on the Bill of Materials. Make sure your toolbox is ready. And grab a drink!

Step-by-Step Assembly Instructions

In general, we will solder the components from smallest to biggest, starting in the middle of the PCB board and working our way towards the edges. To begin, place the PCB in a vise or third-hand holder so that it will be easy to work on. Or build a stand using the pcb standoff holes and 4-40 bolts and nuts.

Step 1: General Resistors

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The first components to solder are the five 10k resistors (Brown-Black-Orange-Gold) in the middle of the kegboard pcb.

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Bend the resistors into a staple shape and slip them in. Resistors do not have polarity which means you can put it in ‘either way’ and it will work just fine.

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On the bottom side of the kegboard PCB, bend the wire legs out so that the resistors sit flat against the top of PCB. The resistors should stay in place when you flip the PCB over.

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Using your soldering iron tip, press and heat both the pad (the silver ring around the hole) and lead (wire) at the same time for 2 or 3 seconds. Then insert the tip of the solder in. It doesn’t take much solder to fill the joint. Pull back the solder and then pull back the soldering iron tip. Do this for the remaining leads of the resistors.

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Solder joints should be smooth and shiny and fill the entire pad, wicking up to the lead. You shouldn’t be able to wiggle the wire and have it move in the hole. Don’t forget to clean your soldering iron tip often.

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Using diagonal cutters, cut off the long leads just above the solder joint.

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Next, solder four 1k resistors (Brown-Black-Red-Gold) in the middle bottom of the kegboard PCB. Follow the same steps as above (Bend resistor, place on PCB, solder, cut off excess wire leads, inspect solder joint).

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Next, solder four 1k resistors (Brown-Black-Red-Gold) in the middle top of the kegboard PCB.

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Next, solder one 10k resistor (Brown-Black-Orange-Gold) in the top middle of the kegboard PCB.

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Next, solder two 2.2k resistors (Red-Red-Red-Gold) in the middle of the kegboard PCB.

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Next, solder two 4.7k resistors (Yellow-Purple-Red-Gold) in the middle of the kegboard PCB.

Step 2: Relay Block Discretes

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Next, solder four transistors (NPN 2N3904) in the middle of the kegboard PCB. The transistors are in a TO-92 package, with a semi-cylindrical plastic part and three legs. There is another TO-92 part which is the Onewire temperature sensor. These two parts look very very similar but are completely different so its important to look carefully and make sure that you are going to solder in the part that says 2N3904. Because of the way the pads are layed out, the transistor wont sit flat against the PCB. Thats OK, it should stick up a little bit. Make sure the flat side of the transistor matches the outline on the silkscreen. Bend the middle pin slightly forward to help when inserting the part into the kegboard PCB.

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Next, solder four diodes (1N4148) in the middle right of the kegboard PCB. Diodes only conduct electricity in one direction. This means we can use them to protect our circuitry from negative voltages - a top killer of electronics! Bend the diode into a staple like so. Note that one side has a white/silver/black stripe on it. The silkscreen on kegboard PCB also has a white stripe showing which direction the diode should be placed.

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Next, solder four 1k resistors (Brown-Black-Red-Gold) in the middle right of the kegboard PCB.

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Next, solder four LED’s (RED) in the middle of the kegboard PCB. LEDs are polarized, unlike resistors, the long lead is the positive (+) lead and the short lead is the negative (-) lead. Make sure the LED is placed correctly otherwise it wont work! The kegboard PCB has the negative pads marked with a dash (-).

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Next, solder four 1k resistors (Brown-Black-Red-Gold) in the upper left of the kegboard PCB.

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Next, solder three transistors (NPN 2N3904) in the upper middle of the kegboard PCB.

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Step 3: Flow LEDs

Next, solder two LED’s (Yellow) in the top middle of the kegboard PCB. The location is marked on the kegboard PCB as FLOW_A and FLOW_B.

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Next, solder two LED’s (Green) in the top left of the kegboard PCB. The location is marked on the kegboard PCB as PWR and RFID.

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Step 4: Temperature Sensor

Next, solder the Onewire temperature sensor (DS18B20) in the top left of the kegboard PCB. The temperature sensor is also in a TO-92 package, with a semi-cylindrical plastic part and three legs. Make sure the flat side of the temperature sensor matches the outline on the silkscreen. Bend the middle pin slightly forward to help when inserting the part into the kegboard PCB.

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Step 5: Test Headers

Next, solder the two test flow pin headers in the top middle of the kegboard PCB. You might what to hold the pin header in place with a small piece of tape. Double check that they are straight and plumb to the kegboard PCB.

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Next, solder the RFID reset pin header in the bottom middle of the kegboard PCB.

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Step 6: Capacitor, Switch, and Buzzer

Next, solder the yellow ceramic capacitor in the bottom middle of the kegboard PCB. Ceramic capacitors are not polarized so you can put them in “either way” and they work fine.

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Next, solder the 6mm tactile switch in the bottom left of the kegboard PCB. The tactile switch is used to reset the Arduino since its not possible to reach the reset button once the kegboard shield is on. The tactile switch can go in ‘either way’.

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Next, solder the 12mm round buzzer in the bottom left of the kegboard PCB. Note the positive pin of the buzzer and the positive (+) pin on the kegboard PCB.

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Intermission

That’s all the small discrete components. Now’s a good time to double check all of the solder joints.

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Step 7: RFID

Next, solder the RFID ID/12 chip onto the kegboard PCB. Note, the ID/12 will be tough to insert into the PCB board. The footprint holes are offset to hold it in place during soldering. Turn the PCB over and solder the pins. Start with the four corners to further help hold it in place and then finish the rest of the pins.

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Step 8: Pin Headers

Next, solder the Arduino stackable pin headers (2-8 pin and 2-6 pin) to the kegboard PCB. You really want to hold these pin headers down with tape or something similar. Check the placement of the pin headers so that they are straight, plumb and inline with each other. Start soldering the pins on the end of each pin header and double check that they are still straight, plumb and inline with each other before soldering the rest of the middle pins.

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Step 9: RJ45s

Next, solder the two RJ45 jacks to the kegboard PCB.

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Step 10: Relay Block

Next, solder the four Omron SPDT relays to the kegboard PCB. Solder one or two relays at a time to make sure they stay flat against the kegboard PCB. Hold each relay in place with tape to prevent movement when turning the kegboard PCB over. Make sure to heat the pad and relay pin well and fill with a good amount of solder. These solder joints do require slightly more solder to fill the joint.

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Next, solder the 8-pin Relay InputOutput screw terminals to the right side of the kegboard PCB. Gang up two 3-pin screw terminals with a 2-pin screw terminal to make the large 8-pin set. Again hold in place with tape to prevent movement during soldering.

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Next, solder the 6-pin AlarmGPO screw terminals to the left side of the kegboard PCB. Gang up two 3-pin screw terminals to make the 6-pin set. Also hold in place with tape to prevent movement during soldering.

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Finished!

Congrats that should be 62 parts that you just finished soldering to your kegboard PCB. Now is a good time to look over your kegboard for any missed or bad solder joints.

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Next: Assembling a Coaster
Previous: Parts List

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