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You may also want to buy a portable battery-powered or butane soldering iron to have in the
field, in case you need to tin a wire or repair a solder joint in the field. They work fine, but we
recommend that you do not use them to assemble the Eggtimer, they generally do not put out
as much heat as the electric irons and you may not get really good solder joints, especially if
you use non-leaded solder which has a higher melting point than leaded solder.
Step 1: Sort the Components
Before you start soldering anything, you need to lay everything out and make sure that you are
familiar with all of components, and that you have everything. (Yes, we ARE human and
sometimes make mistakes... if you are missing something, let us know immediately so we can
send you whatever you need). You should have the following parts, check them off as you sort
them...
Qty
Description
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1
Circuit board pre-populated with surface mount sensor and memory
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1
Atmel ATMEGA328P-PU processor chip (big 28-pin IC)
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2
MCT-6 Dual Optoisolators (8-pin chips)
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2
TIP120 Transistors (3-pins)
__
1
LP2950-33 Voltage Regulator (small black plastic part with 3 leads)
__
1
3mm Red LED
__
1
3mm Yellow LED
__
1
Pizo buzzer element (round plastic component with two wires and a hole)
__
1
16.000 MHz ceramic resonator
__
2
820 ohm 1/8 watt resistors (bands are grey-red-brown)
__
1
1K ohm 1/8 watt resistor (bands are brown-black-red)
__
4
2.2K ohm 1/8 watt resistors (bands are red-red-red)
__
1
3.9K ohm 1/8 watt resistor (bands are orange-white-red)
__
4
4.7K ohm 1/8 watt resistors (bands are yellow-purple-red)
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6
10K ohm 1/8 watt resistors (bands are brown-black-orange)
.1 uF multilayer ceramic capacitors (marked "104")
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4
__
1
10 uF electrolytic capacitor (tubular component with two wires,
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