Differences

This shows you the differences between two versions of the page.

--- id2:bom:start [2020/05/03 22:04]
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+++ id2:bom:start [2020/05/06 09:58] (current)
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-====== Introduction to Design (track 2) ======
+====== Introduction to Design (theme 2) development kit parts list ======
-===== R&D kit parts list =====
 {{ :id2:bom:01-p1350496.jpg?direct&200|}}
@@ Line 12: / Line 10: @@
 **2.** Loudspeaker.
 Should not be connected directly to the microcontroller.
-Use at lest a 150Ω series resistor on one of the loudspeaker leads to limit the current.
+Use at least a 150Ω series resistor on one of the loudspeaker leads to limit the current.
+<WRAP>{{ :id2:bom:sp36mm.png?direct&100|}}</WRAP>
 <WRAP clear></WRAP>
 {{ :id2:bom:03-p1350494.jpg?direct&200|}}
@@ Line 23: / Line 22: @@
 The next LED is between pins 2 and 19.
 The last LED is between pins 10 and 11.
+**WARNING:** You cannot connect these LEDs directly to the microcontroller output.
+Use a series resistor of at least 330Ω to limit the current that will flow through the LED.
 <WRAP clear></WRAP>
 {{ :id2:bom:04-p1350492.jpg?direct&200|}}
 **4.** RGB (multi-colour) LED bar graph.
 See the lecture notes for information about the pin connections.
+**WARNING:** You cannot connect these LEDs directly to the microcontroller output.
+Use a series resistor of at least 330Ω to limit the current that will flow through the LED.
 <WRAP clear></WRAP>
 {{ :id2:bom:05-08-p1350493.jpg?direct&200|}}
@@ Line 32: / Line 37: @@
 The shorter lead (also indicated by a flat spot on the body of the LED) is the cathode (negative) connection.
 LEDs drop 2v from anode to cathode.
-You cannot connect these LEDs directly to the microcontroller outputs.
-You should use a series resistor to limit the maximum current to less than 20mA.
+**WARNING:** You cannot connect these LEDs directly to the microcontroller output.
-(10mA is safer, and plenty bright enough.)
+Use a series resistor of at least 330Ω to limit the current that will flow through the LED.
+This current should be less than 20mA.
+mA is both safer and plenty bright enough.
 **6.** Green LEDs.  The same as RED LEDs (5) but green in colour.
@@ Line 41: / Line 48: @@
 **8.** 7-segment LED displays.
+A package containing 8 LEDs the same as the red LEDs (5) above except they are arranged in a pattern to display digits.
+Each display has 10 pins.
 Pin 1 is furthest from the dot; pin 6 is next to the dot.
 Pins 1, 2, 4, 5, 6, 7, 9, and 10 are anodes (positive) terminals to the seven segments and decimal point.
 Pins 3 and 8 are common cathodes (negative) terminals connected to all the segments.
 Each segment is an LED and drops 2v from anode to cathode.
-You must use a series current limiting resistor to ensure only 10mA of current flows through each segment when it is lit.
+You must use a series current-limiting resistor of at least 330Ω to ensure that only 10mA of current flows through each segment when it is lit.
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 {{ :id2:bom:09-11-p1350492.jpg?direct&200|}}
@@ Line 54: / Line 63: @@
 for more information.
-**9.** 4 × 150Ω resistors.  Colour coded: brown green black black.
+**9.** 4 × 150Ω resistors.  Colour coded: brown green black black. {{:id2:bom:r-150r.png?direct&100|}}
-**10.** 4 × 180Ω resistors.  Colour coded: brown grey black black.
+**10.** 4 × 180Ω resistors.  Colour coded: brown grey black black. {{:id2:bom:r-180r.png?direct&100|}}
-**11.** 10 × 330Ω resistors.  Colour coded: orange orange black black.
+**11.** 10 × 330Ω resistors.  Colour coded: orange orange black black. {{:id2:bom:r-330r.png?direct&100|}}
 <WRAP clear></WRAP>
 {{ :id2:bom:12-14-p1350491.jpg?direct&200|}}
-**12.** 1 × 10kΩ resistors.  Colour coded: brown black black red.
+**12.** 1 × 10kΩ resistors.  Colour coded: brown black black red. {{:id2:bom:r-10k.png?direct&100|}}
-**13.** 5 × 47kΩ resistors.  Colour coded: yellow violet black red.
+**13.** 5 × 47kΩ resistors.  Colour coded: yellow violet black red. {{:id2:bom:r-47k.png?direct&100|}}
-**14.** 2 × 4.7MΩ resistors.  Colour coded: yellow violet green.
+**14.** 2 × 4.7MΩ resistors.  Colour coded: yellow violet green. {{:id2:bom:r-4m7.png?direct&100|}}
 <WRAP clear></WRAP>
 {{ :id2:bom:15-16-p1350495.jpg?direct&200|}}
@@ Line 72: / Line 81: @@
 **16.** LM35 centigrade temperature sensor.
-<WRAP clear></WRAP>
+<WRAP>
+{{ :id2:bom:lm35-dsc03363.jpg?direct&50|}}
+**WARNING:** These devices are completely different to the BC548 transistors (27) even though they look identical.
+Before using either in a circuit, verify the code printed on the device to make sure it is the one you intend to use.
+Using the wrong device in the circuit could destroy it.
+</WRAP><WRAP clear></WRAP>
 {{ :id2:bom:17-p1350490.jpg?direct&200|}}
 **17.** 5 × momentary-action push-button switches.
@@ Line 90: / Line 105: @@
 **21.** 100nF ceramic capacitor.  Marked: 104.
+{{:id2:bom:c-series.png?direct&400|}}
 <WRAP clear></WRAP>
 {{ :id2:bom:23-24-p1350495.jpg?direct&200|}}
+<WRAP>
 **23.** 2 × 74HC164 octal serial-in parallel-out shift register.
+{{ :id2:bom:74hc164-p1350532.jpg?direct&100|}}
+With the U-shaped notch on the left, pin 1 is bottom-left, pin 7 is bottom-right, pin 8 is top-right and pin 14 is top-left.\\ \\
 **24.** 2 × 74HC595 octal serial-in parallel-out shift register with tri-state output register.
-<WRAP clear></WRAP>
+{{ :id2:bom:74hc595-p1350532.jpg?direct&100|}}
+With the U-shaped notch on the left, pin 1 is bottom-left, pin 8 is bottom-right, pin 9 is top-right and pin 16 is top-left.
+</WRAP><WRAP clear></WRAP>
 {{ :id2:bom:25-26-p1350495.jpg?direct&200|}}
+<WRAP>
 **25.** MCP3204 4-channel 12-bit analogue-to-digital converter with SPI interface.
+{{ :id2:bom:mcp3204-p1350532.jpg?direct&100|}}
+The dot indicates pin 1.  Pins are numbered anti-clockwise.\\ \\
 **26.** MCP4822 2-channel 12-bit digital-to-analogue converter with SPI interface.
+{{ :id2:bom:mcp4822-p1350532.jpg?direct&100|}}
+The dot indicates pin 1.  Pins are numbered anti-clockwise.
+</WRAP>
 **WARNING:** integrated circuits (23-26) are very sensitive to static electricity.
@@ Line 110: / Line 137: @@
 In dry weather you can sometimes feel a jolt as this electricity discharges from you when you touch a metal object such as a door handle.
 This static electric charge that accumulates on you can also instantly destroy an integrated circuit.)
+Note: there are extra markings on these integrated circuits.
+The maker is shown in front of the device number (SN = Texas Instruments, MCP = Microchip)
+and the package type is sometimes shown after the device number (N = plastic).
 <WRAP clear></WRAP>
 {{ :id2:bom:27-p1350492.jpg?direct&200|}}
 **27.** BC548 general-purpose NPN silicon bipolar junction transistor.
-<WRAP clear></WRAP>
+<WRAP>
+{{ :id2:bom:bc548-dsc03366.jpg?direct&50|}}
+**WARNING:** These devices are completely different to the LM35 temperature sensors (16) even though they look identical.
+Before using either in a circuit, verify the code printed on the device to make sure it is the one you intend to use.
+Using the wrong device in the circuit could destroy it.
+</WRAP><WRAP clear></WRAP>
 {{ :id2:bom:28-30-p1350487.jpg?direct&200|}}
 **28.** USB cable type A to type B.

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