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ASSEMBLY (MAIN BOARD)
We are now going to build the main board. We will refer to the parts
placement page in the later part of this manual for placement. This is where
the brains and the brawn of the project are. It contains the microcontroller (U4)
and the 12-bit analog to digital converter, as well as some signal conditioning.
We will begin at the front of the PCB and work towards the back. Note that J1
and J5, which are indicated on the board, are actually J6 and J2 respectively,
so you don't need additional headers for these parts. They are installed when
we mount the display panel to the main board later.
1. Install C11, a 0.1uF ceramic capacitor (Marked 104).
2. Install C26, a 0.01uF ceramic capacitor (Marked 103).
3. Install R21, a 1K ohm resistor (brown-black-red).
4. Install R9, a 2.0K ohm 1% resistor (red-black-black-brown).
5. Install R7, a 13.0K ohm 1% resistor (brown-orange-black-red).
6. Install C6, a 0.01uF ceramic capacitor (Marked 103).
7. Install R5, a 10.0K ohm 1% resistor (brown-black-black-red).
8. Install C5, a 10uF electrolytic capacitor. Note that electrolytic capacitors
are sensitive to polarity; they are only properly installed in one direction!
The capacitors typically have a stripe indicating the negative side (-), and
we indicate the positive side on the board (+). Make sure to mount the
negative side of all electrolytic capacitors away from the positive symbol
indicated on our boards.
9. Install C2, a 0.1uF ceramic capacitor (Marked 104).
10. Install R2, a 10.0K ohm 1% resistor (brown-black-black-red).
11. Install C1, a 0.01uF ceramic capacitor (Marked 103).
12. Install R1, a 1.0K ohm 1% resistor (brown-black-black-brown).
13. Install R3, a 1.0K ohm 1% resistor (brown-black-black-brown).
14. Install C4, a 0.01uF ceramic capacitor (Marked 103).
15. Install R6, a 10.0K ohm 1% resistor (brown-black-black-red).
16. Install R20, a 1K ohm resistor (brown-black-red).
17. Install C25, a 0.01uF ceramic capacitor (Marked 103).
18. Install C18, a 0.1uF ceramic capacitor (Marked 104).
19. Install R11, a 47K ohm resistor (yellow-violet-orange). Note this
resistor is installed in a stand-up position.
PM10DC 16
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