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Figure 17-1 Balloon telemetry circuit main schematic.
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original STAMP 2. Install two male circuit board headers, one for the programming cable J1 and another for the audio/control cable J2. A cable can now be constructed between P1 and a 9 pin RS-232 female connector to allow you to download the balloon telemetry program. Next, make up a cable from P2 to a connector leading to your transmitter unit, which will provide control and audio connections from your controller to your radio. Once the circuit has been constructed and mounted in a small plastic box, Styrofoam can be placed around the plastic box to provide a safety enclosure for the circuit board. You will be ready to download the balloon telemetry program into the STAMP 2. Apply power to the circuit and download the program. Once the program is installed and running you can test out the system initially. You may wish to program your own call letters into the system. Take a look at the program and scroll down to the line: lookup index1, (130,13,180,99,163),Character N4YWK. You will have to change the numerical data to reflect your own call sign.
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The balloon telemetry system is shown here in two major configurations, but the system is flexible and will allow many different setups. If you choose to use the balloon telemetry project to simply send temperature and pressure readings, you can use the relay RY1 to key a 146- or 440-MHz transmitter. The line from P3 can be used to feed the audio output from the STAMP 2 to the microphone input of the telemetry transmitter used; see Fig. 17-2. If you elect to use the camera option with a mini TV camera and an ATV transmitter, you can feed the audio output of the STAMP 2 at pin P3 to the audio input to the ATV transmitter. Using this method, you can transmit both camera pictures and telemetry audio on the same transmitter. The relay control at P4 can then be used to turn the ATV transmitter on and off. If you are going to use a still-picture film camera with a time lapse feature and a small FRS or 2-m amateur radio transmitter, then you will have to send the audio from P4 to the microphone input of the transmitter you wish to use; see Fig. 17-3.
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Balloon telemetry controller STAMP 2
146/440-MHz radio transmitter
Temp1 Temp2 sensor sensor
12V battery
Power
Figure 17-2 Transmitter hookup.
CONTROLLER OPERATION 231
Antenna Pressure sensor Camera ATV 450/900 MHz transmitter PWR Audio Balloon telemetry controller STAMP 2 Temp1
Temp2 Control PWR Servo Mirror
12V battery
Figure 17-3 ATV video transmitter hookup.
Now that your balloon telemetry circuit is complete, you will need to locate the STAMP 2 Windows editor program titled STAMPW.EXE. Next, connect up your programing cable and apply power to the circuit. Finally, you will need to download the balloon telemetry program named BTELEMETRY.BS2 (Listing 17-1). With power applied to the balloon telemetry circuit and a transmitter connected to the system, you can make a few tests. The system will begin transmitting an ID tone and then will begin sending data in the form of CW or Morse code. Next, apply heat/cold to one of the thermistors and when the transmitter begins sending CW again on its next cycle, the CW message will reflect a different value for the changed temperature reading from the heated or cooled thermistor.
Controller Operation
In operation the system will first send the call sign of the radio operator. Next, it will send raw data in decimal values of the current pressure reading. The system will next send the two thermistor readings. The telemetry unit will send data by first sending the thousands value, then the hundreds, next the tens, and finally the ones. The system will cycle through the pressure and temperature values and then move the mirror, so that the camera will get a particular view. Once the new cycle begins anew, the new pressure and temperature readings will be followed by a mirror movement. If you elect to use the camera option, you will need to obtain a model airplane hobby servo. The servo is mounted to a small mirror. The STAMP 2 controls the servo, allowing two mirror positions, so the system will cycle between the two positions, allowing two camera views. You will need to experiment with the placement of the mirror with respect to your small TV camera, in order to maximize the viewing angles seen. This camera option adds an exciting new aspect to your balloon or rocket flights! This project is a lot of fun and can be addictive!
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