ASSEMBLING. the. ECEbot. Printed Circuit Board: Part Three. The Part Three assembly steps must be completed prior to lab session #5:

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1 ASSEMBLING the ECEbot Printed Circuit Board: Part Three The Part Three assembly steps must be completed prior to lab session #5: Due Date: Prepared by B.A. Towle and R.C. Maher September 2004 Copyright Department of Electrical and Computer Engineering, Montana State University, 2004 All Rights Reserved RCM

2 PCB Assembly Part Three Soldering Step 5: Display and DIP Switch System Display resistors (back of board) There are eight 300Ω resistors that need to be mounted from the back of the board near the top in the area under where the 4-digit LED display will be placed. Figure 3-1 shows a close-up of the board layout, and Figure 3-2 is a photograph of the board after the eight resistors have been installed. Challenge: Determine the resistor color bands corresponding to 300Ω, 5% tolerance, and locate the eight resistors in your lab kit. Hint: It is highly recommended that groups of resistors be oriented so that the color band orientation is all the same direction whenever possible. This makes it easy to verify the circuit later. Figure 3-1: Layout of the back side of the PCB in the area behind the LED display. Figure 3-2: Photograph of resistors as installed on the back of the board. (The answer to the challenge is Orange Black Brown Gold).

3 PCB Assembly Part Three 3 Carefully bend the wire leads on one of the resistors and insert the leads from the back of the board through one of the hole pairs. Flip the board to the front side and solder the two wire leads of the resistor to the pads on the front side. The 4-digit LED display will be mounted flush to the board on the front side, so therefore the solder should be as flat as possible on the pad. Back Side When the solder is cool, gently snip off the excess wire again without allowing the end to shoot away. Repeat the process for the other seven 300Ω display resistors Display and DIP switches (front of board) Figure 3-3 shows the location of the 4-digit LED Display (DISP1) and dual-inline package (DIP) switch mode selector (S1) to be mounted at the top center of the PCB. Figure 3-3: Display and DIP Switch system First, take the 4-digit display and insert its 12 pins with the same orientation as the silk screen: decimal points to the bottom right of each digit. As before, use a piece of tape or some other technique to keep the display flush with the PCB while soldering the display's pins on the back side. Next, use a similar process to solder the 16 pins of the DIP switch (S1), making sure that the switch numbers and ON label read right-side up before you start soldering.

4 PCB Assembly Part Three Soldering Step 6: LED Circuits The final components to install (whoo whoo!) are the four general-use LEDs and their support circuitry Components list The components you will use for this step are listed below. Find each of the components from your parts kit: Four red LEDs, LED2, LED3, LED4, LED5 Four 470 Ω resistors, R21, R22, R25, R26 (¼ watt) Two 2-pin headers, J11, J Installing the LED circuits Insert the LEDs into the board, being particularly careful to make sure the LEDs are oriented correctly: long lead (anode) and short lead (cathode). Solder the LEDs in place. Now install the four current limiting resistors, one per LED circuit. Finally, install the two 2-pin headers near LED4 and LED5. LED4 LED5 2-pin header 2-pin header LED2 LED3

5 PCB Assembly Part Three 5 Hint: Keep in mind that there will be several unfilled positions on the PCB, including the three unused potentiometers and adjacent 2-pin headers, and the components in the Sound Output section (see Figure 3-4). These optional components will not be used in EE101, but you can purchase and add them later on if you decide to do your own programming projects that require additional analog inputs or a beeper output. Figure 3-4: Unused areas of the PCB

6 PCB Assembly Part Three Final PCB Visual Inspection Take a moment to examine the board carefully and critically. Are there any missing components other than the unused areas of the board? Are all the pins soldered completely? Are there any "whiskers" or "solder bridges" between the pads? Is there any loose debris (like solder crumbs or metal flakes) caught anywhere on the board? Look closely. Do you see any damage to the board or its components, like bent pins, cracked housings, or crushed LEDs? Be sure to ask your instructor or lab TA to examine any questionable areas of your PCB. You will perform electrical tests during the next lab session. You must complete the entire PCB assembly to this point by the start of Lab #5.

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