Kegboard Guide
From KegbotWiki
Kegboard - Assembly Guide
First Draft
Note, the build pictures have not been added to this wiki page, yet...
For now follow allow at http://ge0ffc.imgur.com/kegboardmini and http://ge0ffc.imgur.com/kegboardcoaster
The Kegboard circuit board is a Arduino compatible shield built to control and monitor a kegerator.
Contents |
Schematics
kegboard schematic.
kegboard PCB board layout
kegboard-coaster schematic.
kegboard-coaster PCB board layout
Tools
There are a few tools that are required for assembly. Many of these tools are available at places like Radio Shack or other (higher quality) DIY electronics stores. You should get them wherever is most convenient/inexpensive. If you don't have them, now would be a good time to borrow or purchase them. They are very handy whenever assembling/fixing/modifying electronic devices!
- Soldering iron (small screw driver or wedge shaped soldering iron tip)
- Solder (60/40 Rosin-core solder 0.032")
- Brass sponge soldering iron tip cleaner
- Desoldering tool/braid
- Wire cutter/stripper
- Flush/diagonal cutter
- Needle-nose pliers
- Multimeter
- Vise or third-hand holder
- Good light (more important than you think)
Parts list
- Kegboard and kegboard-coaster pcb's: Kegboard shields
- Refer to the BOM wiki page for all discrete components: Kegboard_Parts
Assembly Steps - kegboard
First, make sure you have all the necessary parts. Check the Bill of Materials. Make sure your toolbox is ready.
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. [PICTURE]
Next, solder five 10k resistors (Brown-Black-Orange-Gold) in the middle of the kegboard pcb. 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. [PICTURE]
Bend the wire legs out so that the resistor sits flat against the PCB. [PICTURE]
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 poke the end of the solder in. It doesn't take much solder to fill the joint. Pull back the solder end and then pull back the soldering iron tip. Do this for the remaining leads of the resistors. Don't forget to clean your soldering iron tip often. [PICTURE]
Using diagonal cutters, cut off the long leads just above the solder joint. Inspect your soldering joints as you go, you should have clean solder joints. [PICTURE]
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). [PICTURE]
Next, solder four 1k resistors (Brown-Black-Red-Gold) in the middle top of the kegboard PCB. [PICTURE]
Next, solder one 10k resistor (Brown-Black-Orange-Gold) in the top middle of the kegboard PCB. [PICTURE]
Next, solder two 2.2k resistors (Red-Red-Red-Gold) in the middle of the kegboard PCB. [PICTURE]
Next, solder two 4.7k resistors (Yellow-Purple-Red-Gold) in the middle of the kegboard PCB. [PICTURE]
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. [PICTURE]
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. [PICTURE]
Next, solder four 1k resistors (Brown-Black-Red-Gold) in the middle right of the kegboard PCB. [PICTURE]
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 (-). [PICTURE]
Next, solder four 1k resistors (Brown-Black-Red-Gold) in the upper left of the kegboard PCB. [PICTURE]
Next, solder three transistors (NPN 2N3904) in the upper middle of the kegboard PCB. [PICTURE]
Next, solder two LED's (Yellow) in the top middle of the kegboard PCB. [PICTURE]
Next, solder two LED's (Green) in the top left of the kegboard PCB. [PICTURE]
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. [PICTURE]
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. [PICTURE]
Next, solder the RFID reset pin header in the bottom middle of the kegboard PCB. [PICTURE]
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. [PICTURE]
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'. [PICTURE]
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. [PICTURE]
That's all the small discrete components. Now's a good time to double check all of the solder joints. [PICTURE]
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. [PICTURE]
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. [PICTURE]
Next, solder the two RJ45 jacks to the kegboard PCB. [PICTURE]
Next, solder the four Omron SPDT relays to the kegboard PCB. Solder each relay separately 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 to solder. Make sure to heat the pad and relay pin well and fill with a good amount of solder. These solder joints do require slight more solder. [PICTURE]
Next, solder the 8-pin Relay Input\Output 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. [PICTURE]
Next, solder the 6-pin Alarm\GPO 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. [PICTURE]
Congrats that should be 63 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. [PICTURE]
Assembly Steps - kegboard coaster
To begin, solder one 1k resistor (Brown-Black-Red-Gold) to the kegboard-coaster PCB. Follow the same steps as above (Bend resistor, place on PCB, solder, cut off excess wire leads, inspect solder joint). [PICTURE]
Next, solder the yellow ceramic capacitor to the kegboard-coaster PCB. Ceramic capacitors are not polarized so you can put them in "either way" and they work fine. [PICTURE]
Next, solder the Onewire temperature sensor (DS18B20) to the kegboard-coaster PCB. 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-coaster PCB. [PICTURE]
Next, solder the LED (Green) to the kegboard-coaster PCB. The negative (-) pad for the LED is not mark on the pcb. The negative or short pin of the LED should be soldered into the pcb towards the blue screw terminals. [PICTURE]
Next, solder the three 6-pin Flow\Onewire\GPO screw terminals to the kegboard-coaster PCB. Gang up two 3-pin screw terminals to make each 6-pin set. Hold in place with tape to prevent movement during soldering. [PICTURE]
Next, solder the RJ45 jack to the kegboard-coaster PCB. [PICTURE]
