sparkfun Weevil Eye Information & Instructions Download Page 8

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Once the Weevil Eye is soldered, we can test the board’s functionality. 

• Put the 20mm coin cell battery into the battery holder, positive 
side up. 

• If it’s dark, you should see the LEDs light up. If not, cover the sensor 
with your finger to test.

• If your Weevil’s eyes aren’t lighting up, don’t worry! Start with some 
simple troubleshooting. Check your solder joints to make sure your 
components have a good connection to your board – solder should 
flow into the board and not ball up around the component’s pins. Also 
check to make sure your transistor and LEDs are correctly oriented! 

QUICK TEST INSTRUCTIONS

Summary of Contents for Weevil Eye

Page 1: ...ed the brighter the friendly weevil s eyes will glow There is no programming involved and all soldering is beginner friendly so this kit is perfect for the embedded electronics novice Kit includes Wee...

Page 2: ...straight onto the iron and try to apply the solder with the iron SOLDERING TIPS SOLDERING TIPS Solder flows around the leg and fills the hole forming a volcano shaped mound of solder Error Solder ball...

Page 3: ...Bend the legs downward Locate the 47k Resistor position on the board 47K 220 220 QUICKSTART YOUR FIRST COMPONENT STEPS1T012 3 4 Insert the resistor into the PCB 5 Push the resistor in so it is nearly...

Page 4: ...the soldering iron s sweet spot so it touches both the leg and the metal ring Hold for two seconds 11 Solder the next leg into place 12 Clip off the excess 10 Your solder joints should look like this...

Page 5: ...ottom of the board Orientation for this device doesn t matter Transistor 2N3904 It s the only three pin device and it s black Notice the silkscreen white print on the board resembles a half circle Mak...

Page 6: ...nents are polarized CONTINUE ON THE TOP OF THE BOARD LEDs Insert the LEDs into the front of the board Each LED has a short leg and a long leg The short leg goes into the hole labeled Also make sure it...

Page 7: ...E BOTTOM OF THE BOARD Battery Clip Turn the board over and align the battery clip with the white footprint on the Weevil Eye s back Make sure the legs stick through the board and that the part is layi...

Page 8: ...f not cover the sensor with your finger to test If your Weevil s eyes aren t lighting up don t worry Start with some simple troubleshooting Check your solder joints to make sure your components have a...

Page 9: ...melt metal It is normal for the handle of the soldering iron to heat up a bit Hold it like a pencil and move your hand further away from the tip if the heat is uncomfortable The solder smokes because...

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