HeaterMeter 4.3 LCD Buttton Board Assembly
The HeaterMeter v4.3 LCD Backpack PCB has two sides and components are placed on both. The silkscreen outlines indicate the component footprints where they should placed. As with the main board, the easiest way to assemble the board is to start with the flattest components and work your way to the larger pieces.
The bottom of the LCD board is the side opposite the side with the "HeaterMeter LCD Backpack" text on it, where the majority of the components will be placed.
| Qty | Value | Device | Parts |
|---|---|---|---|
| 2 | 220 | R-US_0204/7 | R12, R15 |
| 1 | 1k | R-US_0204/7 | R10 |
| 1 | 1k2 | R-US_0204/7 | R8 |
| 1 | 1k8 | R-US_0204/7 | R11 |
| 1 | 3k9 | R-US_0204/7 | R2 |
| 1 | 8k2 | R-US_0204/7 | R9 |
Step 1 All resistors. The orientation on these does not matter-- either lead can go in either hole, as long as the body of the resistor is on the right side of the board. The placements are sized such that you should be able to fold the leads of the resistor against the body at a right angle and have them just fit into the holes. It is fastest to insert a couple resistors at a time and flip the whole board over, resting the board on the resistors to hold them in place while you solder them and clip the extra leads off.
| Qty | Value | Device | Parts |
|---|---|---|---|
| 1 | 0.1u | C-US025-025X050 | C10 |
Step 2 Ceramic capacitor. This small yellow blob also has no polarity, so its orientation does not matter.
| Qty | Value | Device | Parts |
|---|---|---|---|
| 1 | 74HC595N | 74LS595N | IC3 |
| 1 | BS170 | BS170 | Q4 |
Step 3 Install the 16 pin shift register into its footprint. This part has a notch on one side of them which indicates the direction it needs to be placed which matches the notch on the PCB silkscreen. It is easier to install if the legs of the IC are bent inward by pushing them sideways against the table before inserting. The final BS170 MOSFET can then be installed.
| Qty | Value | Device | Parts |
|---|---|---|---|
| 1 | LCD1M, LCD2M | 1X5 M | JP1, JP8 |
Step 4 Break off 2x 5-pin segments from the pin header strip. To make an accurate snap, grip the pin header with needlenose pliers with exactly 5 pins exposed and bend the plastic pin carrier to break off the required number of pins. These pins should be installed such that the small end of the header is inserted into the bottom side of the board, so the longer pins will extend away from the board. To get these to be soldered straight, solder only one pin lightly. Then hold the board in your hand, with your finger on the header and touch the soldering iron to the one pin you've soldered. While the solder is hot, wiggle the pins to get them installed at a perfect right angle to the PCB. Once the pins are properly placed, solder the remaining pins first, and then go back and retouch the first pin to assure a good solder joint.