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- IMG 8800
- IMG 8801
- IMG 8802
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- IMG 8805
- IMG 8806
- IMG 8807
- IMG 8808
- IMG 8809
IMG 4237
IMG 4239
IMG 4241
IMG 4245
IMG 4246
IMG 4248
IMG 4249
IMG 4250
IMG 4254
IMG 4256
IMG 4260
IMG 4262
IMG 4263
IMG 4265
IMG 4269
IMG 4270
IMG 4272
IMG 4274
IMG 4276
IMG 4277
IMG 4279
IMG 4280
IMG 4282
IMG 4286
IMG 4287
IMG 4292
IMG 4293
IMG 4294
IMG 4295
IMG 4296
IMG 4297
IMG 4298
IMG 4299
IMG 4300
IMG 4301
IMG 4303
IMG 4304
IMG 4305
IMG 4308
IMG 4309
IMG 4310
IMG 4313
IMG 4314
IMG 4315
IMG 4317
IMG 4318
IMG 4319
IMG 4320
IMG 4321
IMG 4322
IMG 4323
IMG 4324
IMG 4325
IMG 4327
IMG 4328
IMG 4329
IMG 4330
IMG 4331
IMG 4332
IMG 4333
IMG 4334
IMG 4335
IMG 4336
IMG 4337
IMG 4338
IMG 4339
IMG 4340
IMG 4341
IMG 4342
IMG 4343
IMG 4344
IMG 4390
IMG 4391
IMG 4392
IMG 4393
IMG 4394
IMG 4395
IMG 4396
IMG 4397
IMG 4398
IMG 4399
IMG 4400
IMG 4401
IMG 4402
IMG 4403
IMG 4413
IMG 4414
IMG 4415
IMG 4416
IMG 4417
IMG 4418
IMG 4419
IMG 4420
IMG 4421
IMG 4422
IMG 4425
IMG 4427
IMG 4428
IMG 4429
IMG 4430
IMG 4431
IMG 4451
IMG 4453
IMG 4454
IMG 4455
IMG 4456
IMG 4457
IMG 4458
IMG 4459
IMG 4460
IMG 4461
IMG 4462
IMG 4463
IMG 4464
IMG 4465
IMG 4466
IMG 4467
IMG 4468
IMG 4469
IMG 4470
IMG 4471
IMG 4472
IMG 4473
IMG 4474
IMG 4475
IMG 4476
IMG 4477
IMG 4478
IMG 4479
IMG 4480
IMG 4481
IMG 4482- IMG 4547
- 3C2A3239
- 3C2A3249
- 3C2A3251
- 3C2A3261
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- 3C2A3341
MOV00230
3C2A1882
3C2A1886
3C2A1888
3C2A1891
3C2A1893
3C2A1894
3C2A1895
3C2A1897
3C2A1900
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3C2A1955
3C2A1961
3C2A1963
3C2A1965
3C2A1971
3C2A1973
3C2A2012
3C2A2014
3C2A2016
3C2A2019
3C2A2022
3C2A2023
3C2A2024
3C2A2033
3C2A2034
3C2A2038
3C2A2040
3C2A2042
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3C2A4771
3C2A4821
3C2A4856
3C2A4857
3C2A4863
3C2A4865
3C2A4866
3C2A4869
3C2A4871
Merlin's Cave
3C2A4876
3C2A4877
3C2A4887
3C2A4889
3C2A4893
3C2A4900
3C2A4903
3C2A4904
3C2A4906
3C2A4912
3C2A4919
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3C2A4929
3C2A4969
3C2A4971
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3C2A4991
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3C2A5006
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3C2A5021
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3C2A5030
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3C2A5076
3C2A5086
3C2A5106
3C2A5108
3C2A5118
3C2A5123
3C2A5179
3C2A5183
3C2A5193
3C2A5202
3C2A5209
IMG 5823
IMG 5836
IMG 5846
IMG 5847
IMG 5866
41176958-EFF3-49C6-8004-A401AC0F95F8
IMG 5872
IMG 5876
Stockton STEM Badge boards
The badge printed circuit board (PCB) comes in several colors.
Stockton STEM Badge components
The badge consists of a handful of electronic components. Components R1, R5 and J1 are not normally populated.
Stockton STEM Badge microcontroller
The chip is an inexpensive "PIC" microcontroller; this runs a program that controls the LEDs.
Stockton STEM Badge resistors
These are 47 ohm resistors; they limit the current supplied to the orange, yellow and green LEDs. The blue LED does not require one.
Stockton STEM Badge capacitors
The capacitors smooth the power on the badge. The top capacitor, is not polarity sensitive; that is, it can be used either way round. The other capacitor must be used only the correct way round; the case has a "-" symbol printed on it.
Stockton STEM Badge LEDs and button
Orange and yellow LEDS. The pushbutton switch allows a person to control the badge.
Stockton STEM Badge LEDs
Green and blue LEDs
Stockton STEM Badge LEDs
Notice how the LEDs typically have one leg longer than the other; this is called the "anode". The colored case also has one flat side, opposite the longer leg; the leg on this side is called the "cathode". Also, note the distinctive shape of what is inside the colored case; this can also be used to help determine its orientation. The gap at the top of the metal surface is always on the anode side. LEDs can only be used the right way round so determining orientation is important.
Stockton STEM Badge LEDs
Stockton STEM Badge LEDs
Stockton STEM Badge components
Stockton STEM Badge IC and socket
The chip, an integrated circuit, or IC, must also be used the correct way round. Both the chip and its socket have a notch at one end to identify its orientation.
Stockton STEM Badge IC and socket
The legs of the chip need to be straight otherwise they will not properly insert into their positions in the socket. It is easy to bend or break the legs if care is not taken.
Stockton STEM Badge resistor legs
The resistor legs need to be bent in order to insert them into the board.
Stockton STEM Badge resistor legs
The legs are passed through the board holes; they may need pulling firmly, but not too firmly, with pliers to pull the resistor body flush with the board.
Stockton STEM Badge resistor legs
The legs are then carefully bent to about 45 degrees to hold the resistor in place for soldering.
Stockton STEM Badge resistor legs
Soldered legs; only a small amount of solder is needed and it heat should be applied only briefly.
Stockton STEM Badge resistor legs
The legs are trimmed, the excess removed with side-cutters.
Stockton STEM Badge decoupling capacitor
This ceramic capacitor is not orientation sensitive. Decoupling means it absorbs electrical noise and is used to filter the power feeding the microcontroller.
Stockton STEM Badge decoupling capacitor
The capacitor should sit flush with the board.
Stockton STEM Badge decoupling capacitor
As with the resistors, the legs should be splayed a little to help hold it in place for soldering.
Stockton STEM Badge IC socket
Note the orientation of the indent at the upper edge of the IC socket.
Stockton STEM Badge IC socket
The IC socket should lay flat against the board.
Stockton STEM Badge IC socket
Soldering one leg first and checking that the socket is flat against the board avoids a simple mistake. If it is not flat, or otherwise misaligned simply re-heating the leg will help correct the issue. Once orientation and alignment is verified, solder the remaining legs. Sometimes a small shim, such as the black foam here, can help keep the board level and simplifies the task.
Stockton STEM Badge IC socket
Soldered legs.
Stockton STEM Badge electrolytic capacitor
Electrolytic capacitors are polarity sensitive; note the "-" symbol on one side of the capacitor package. These capacitors typically have a larger capacity than their ceramic counterparts and are used for bulk storage; this one is used to assist the battery when the LEDs turn on. This is necessary because button cell batteries are not designed to provide as much power as the LEDs can demand.
Stockton STEM Badge electrolytic capacitor
Orientation of this capacitor is important. There is a "+" symbol in the footprint of the component printed on the board; the "-" of the capacitor should be on the opposite side.
Stockton STEM Badge button
The push-button switch will fit two ways. Orientation does not matter.
Stockton STEM Badge button
As with the IC socket, soldering one leg first and verifying component alignment will help prevent easy mistakes.
Stockton STEM Badge LEDs
LEDs have a flat edge on one side of their case.
Stockton STEM Badge LEDs
The footprint for the LEDs also shows a flat edge; orientation of the LEDs needs to match that of the board.
Stockton STEM Badge LEDs
While all components can be destroyed with an excess of heat during soldering, LEDs are especially susceptible to this.
Stockton STEM Badge LEDs
The case of an LED can crack if the legs are bent too close to it; even after placing the LED on the board, only bend the legs slightly to hold it in place.
Stockton STEM Badge LEDs
All the LEDs have been soldered. Notice that they all have the same orientation; the flat edge is to the left.
Stockton STEM Badge battery
The battery holder is a simple metal cage that solders to the underside of the board.
Stockton STEM Badge battery
Note the orientation of the holder; reversing it will make it difficult to insert the battery later.
Stockton STEM Badge battery
It is possible for the holder to become hot during soldering; be careful when handling immediately after soldering.
Stockton STEM Badge IC
The IC pins need to be straight and line up with their receptacles in the socket.