New Temp
CricketSat
Assembly Using Proto Board
and PCB Board
3/17/04
1
Read this entire document before starting
1. Start assembly with the socket only for the circuit show on page 3. Do
not put the 555 IC in the socket until instructed.
2. Lay out components neatly. See the socket layout on page 4. Notice
the notch on the socket. Place it on your protoboard on the left side.
Be sure to keep the top of the socket open so that you can insert the
IC.
3. Use only the hookup wires purchased in the kit package.
4. Do the first test with C1 = 0.1 uF.
5. Use the four pin socket for the TX433 and the two pin socket for the
thermister.
2
12/12/03
v.20
5 vdc Power Supply
Temperature Sensor
5 vdc regulated
Output
To Tx
R3 = 680
D2
Notes:
C8 should have a good temp coeff. (polystyrene/polypropylene)
Do not use ceramic for C8
3
555 Socket
1
8
8
1
7
2
2
7
3
6
6
3
4
5
5
4
Top
Bottom
4
1. After you have the circuit assembled on the protoboard, check all of
the connections for continuity and resistance as seen in the circuit.
2. When the check is complete in step 1 and is correct, insert the 555
with the notch or dot on the 555 at the same end as the notch on the
socket.
3. Connect the battery. The LED should glow a constantly.
4. Use the audio amplifier to test if the circuit is oscillating.
5.
6.
Connect the TX433 transmitter and antenna as shown on pages 6 &
7.
Have the instructor check the transmitter output with HT receiver.
5
CricketSat Temperature Circuit
+9v
C11
5+v
C5
+
1
U6
Vout
10uF
3
Vin
.1uF
5v regulator
78L05
2
Gnd
U4
Tx433
+9v
U3
LM555
R3 = 680
D2
Notes:
C8 should have a good temp coeff. (polystyrene/polypropylene)
Do not use ceramic for C8
+9v
6
Antenna
Bare or insulated wire
7”
7”
ANT
VCC
IN
GND
90 0
Circuit Diagram
GND
ANT
9 VDC
Proto Board
Actual Circuit
7
1. You are now ready to start the design of the CricketSat
for assembly on the printed circuit board (PCB) in your
kit.
2. See page 9 for example of layout on PCB.
3. Do not put any components on the PCB.
4. Finish the design on the diagrams on pages 10 & 11
before assembling any parts on the PCB.
5. Use the 4 pin an 2 pin sockets for the TX433 and the
thermistor.
8
TX433 to be
mounted in
socket
PC Board
TX433
Socket
(If used)
555 Timer
Socket
Radio Shack
Cat No. 276-159B
Back Side
Mounting of
Sockets Front
Side
9
Practice
Layout
276-159B
Radio Shack
BACK
10
Practice
Layout
FRONT
11
CricketSat Parts List
03/17/04
System
Sch
Part CategoryDesig
Part Description
Part Type/Value
Vendor
Part #
Qty
Temperature
Capacitor
C7
Capacitor
Cap,
0.1uF, Mono, 50v, 20%
Jameco
25523
1
Temperature
Capacitor
C9
Capacitor
Cap,
0.1uF, Mono, 50v, 20%
Jameco
25523
1
Tx
Capacitor
C10
Capacitor
Cap,
0.1uF, Mono, 50v, 20%
Jameco
25523
1
Vreg
Capacitor
C11
Capacitor
Cap,
0.1uF, Mono, 50v, 20%
Jameco
25523
1
Temperature
IC 555
U3
IC, LM555CN timer
LM555, IC Timer
Jameco
27422
1
Tx
Resistor
R10
Resistor, Carbon, 10k
10k, 5%, 1/4w
Jameco
29911
1
Temperature
Resistor
R8
Resistor, Carbon,
3.3k
3.3k, 5%, 1/4w
Jameco
30672
1
Temperature
Resistor
R3
Resistor, Carbon,
680 ohms
680, 5%, 1/4w
Jameco
31499
1
Temperature
LED
D2
LED, LF3330, Green
LED, Green Diffused (XC556G)
Jameco
34761
1
Vreg
Regulator
U6
Linear Regulator, 5v, 100mA
78L05, Linear Regulator, 5v, 100mA
Jameco
51182
1
Temperature
Battery Clip
9v
Bat Snap, 6", 26 AWG,2 Prong
Jameco
109153
1
Tx
Resistor Pot
R9
10k Cermet trim pot
Jameco
182836
1
Vreg
Capacitor
C5
Capacitor
Jameco
198838
1
Temperature
Thermistor
R7
Thermistor
Jameco
207036
1
Temperature
Socket
U3
Socket
Socket, IC, Machined, 8 Pin
Jameco
521570
1
Temperature
Circuit Board
Printed Circuit Board
Generic vector board (2/pkg)
Rad Shk
276-159b
1
Tx
Antennas
18 AWG solid wire - 7-1/4" long
Rad Shk
278-1217
1
Temperature
Tx
Capacitor
Transmitter
Cap, 0.1uF, Polypropylene
433 MHz Transmitter Module
Digikey
Q Kits
P3104-ND
TX433
1
1
C8
U4
Capacitor
TX433
10k Cermet trim pot
Cap,
10uF, Radial, 16v, 20%
10k ohm thermister @ 75 deg F
12