Transcript Document

CricketSat
Construction
Parts List
CricketSat Part List
9/12/2012
Version10.0
Sch
Desig
C1,C2,C5
C3
Part Description
Capacitor
Capacitor
Part Type/ Value
CAP,CERM,DISC,.1uF,25V,20%
Film Capacitors 0.033uF Polypropylene 3%
C4
Capacitor
CAP,MONO,1uF,50V,20%
Switch
LED
Thermistor
SW1
D1
Ra(R2)
SPST Slide SW
LED , RED
Thermistor 10k
SWITCH,SLIDE,MIN,SINGLE POLE DOUBLE THROW (SPDT),ON-ON,PCB
1
MTG,[email protected],LEAD 3mm SP
LED,RED,660NM,T-1 3/4
1
THERMISTOR,NTC,K(+/-10%)
1
Resistor
Resistor
Rb(R1)
R3, R4
Resistor, Carbon 2.7k RESISTOR,CARBON FILM,2.7K OHM,1/4 WATT,5%
Resistor, Carbon,330 ohms
RESISTOR,CARBON FILM,330 OHM,1/4 WATT,5%
IC 555
IC Socket
Socket
U1
J1
J2
LM555CN timer IC
LM555, IC Timer
1
Socket
SOCKET,IC,08PIN,DUAL WIPE,SOLDERTAIL,LOW PROFILE(10)0.30
1
INCH WIDTH
Single In-Line Female Socket
4 Pin .100" Machined Socket
1
Connector
Connector
Thermistor Ext.
Transmitter
BC1
BC2
Thermistor Extension
U1
TX433
Male 9v battery connector
Female 9v battery connector
WIRE,AWG 24/2,TWISTD,RED/WHT
433 MHz Transmitter Module
1
1
1
1
PCB
Antennas
Battery
PCB
Antennas
B1
Printed Circuit Board
CricketSat PCB
18 AWG wire -6.8" long
1
2
1
Cover
Cover
Therm Cover
Therm Cover
1"
1"
HEAT SHRINK,FIT-221B-1/8-Yellow
HEAT SHRINK,FIT-221B-3/16-Yellow
2
1
Part Category
Capacitor
9v Battery
QTY
3
1
1
1
2
Rubber bands - used to hold battery on
Roll masking tape - used between battery and PCB to keep battery from shorting out PCB
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CricketSat Assembly
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Altium
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Schematic
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Follow the GUIDE
Now, Use your CricketSat
construction guide to build
your CricketSat
Pay close attention to
the components that
MUST go in correctly –
8 pin socket and LED
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Follow the GUIDE
Its easy to confuse the
Thermistor with the
ceramic capacitors. The
Thermistor is darker
orange/red and has
longer legs.
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Tips for the thermistor
The thermistor (R2) is connected here.
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Trouble Shooting
Check all solder joints to make sure that all have complete coverage of the via.
Make sure there are no bridges (overlapping) solder between connections.
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Once you’ve successfully
completed the build of
your CricketSat – take lots
of selfies with your
CricketSat and post!!
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1. Tum the switch on in this position.
2. If the LED lights up, go to the next page.
Off
On
.3 If the LED does not lights up, you got big
troubles, but we will tell you how to fix it. See
page 13 for trouble shooting your CricketSat.
1. Turn multimeter to Hz%.
Off
On
2. Connect black lead to pin
1 of J2, Connect red lead to
pin 2 of Je.
3. You should read between
1,1000 and 1500 HZ. If you
do, you are now ready to
calibrate your CricketSat –
another document.
4. IF you read zero Hz, then go to
page 13 to trouble shoot your
CricketSat.
Trouble Shooting your CricketSat
1. Turn off the switch. Remove he LM555
from the socket.
2. REMOVE the
battery.
3. You must to re-inspect the bottom of you PCB
to make sure you have good solder joints on
everything and not bridges. If you find problems
and fix them go back to page 10.
Off
On
4. You will now use your
multimeter to check to make
sure the circuit has the
proper continuity. See page
14.
5. In all your trouble
shooting, keep notes on all
of the measurements you
make.
Trouble Shooting your CricketSat
Checking continuity
1. Be sure your CricketSat is turned off.
Remove the LM555 from the socket.
2. REMOVE the
battery.
Off
On
3. Turn the meter switch to the diode/buzzer
position. Short the read an black leads together
and press the diode/busser button until you hear
the buzzer.
Trouble Shooting your CricketSat
Checking continuity
1. Put the multimeter lead in the socket pins 2. These pins are connected together on the PCB
4 and 8. See pin labeling below, right. Buzzer (see schematic circled) and thus shorted or have
continuity between them.
should sound.
3. If you do not get continuity, then check the
PCB to determine what is wrong.
4. Continue checking other pins:
2-6
Ground on PCB to other pins:
Off
To J2 pin 1
To J1 pin 1
On
1
2
3
4
8
7
6
5
Trouble Shooting your CricketSat
Checking Resistance
1. Be sure your CricketSat is turned off.
Remove the LM555 from the socket.
2. Make sure the battery is removed.
Off
On
3. Turn the meter switch to the resistance - ohms
position. Short the read an black leads together
and press the range button until you read zero.
Trouble Shooting your CricketSat
Checking Resistance and Capacitance
1. Put the multimeter lead in the socket pins
2. Next check between 7 and 6. You will be reading
7 and 8. You should get what? Look at the
the thermistor ~ 10k ohms at room temperature.
schematic – 2.7k ohms.
3. Continue checking other pins:
Off
On
3 to pin J2 pin 2 – 330 ohms
You can not check resistance across a capacitor or
a diode with the resistance setting on the
multimeter. Use the capacitance setting on the
meter to check capacitance.
1
2
3
4. If you find errors, maybe a bad 4
component or wrong component.
8
7
6
5
Trouble Shooting your CricketSat
Checking Voltages
1. Put the battery back in and turn the
switch on.
Off
2. Turn the meter to Vdc and check between pins 1 and 8
on the LM555 socket. You should get approx. minus 9v.
Minus because the red lead is on the ground connection. If
voltage is below 9v, change batteries.
3. Look at the schematic and determine other
places where you should also get 9v. If no
voltage, trouble shoot. What is cause?
On
4. If you find errors, maybe a bad components.
wrong components or bad connections.