Case #89: Nathan Loden: Glidden Special Forces Volunteer

By: 
September 04, 2006

Looking to paint the town red (or his buddies at any rate), Nathan Loden devised this simple device to detect if the paintballs are traveling at a safe speed (& 300 ft/sec). Consisting of sensor circuitry and a microcontroller with a three digit, seven segment display driver, it detects the presence or absence of a ball by measuring the amount of IR energy striking the sensor, causing a voltage swing detectable by the micro. A timer is set to overload if the number of instruction cycles exceeds a limit equal to 300 ft/sec, indicating safe shooting.

Get Nathan Loden's complete instructions on how to build your own paintball safety system .
Paintball Safety System Parts List
Amt Part Description Allied Part #
1 Voltage regulator, 5V 568-3101
2 IR LEDs 980-0002
1 IR Phototransistor 980-0165
1 Capacitor, 0.1 muF disk 881-0192
1 Capacitor, 0.33 muF disk 881-0195
1 Green LED 263-1170
1 Red LED 679-9981
1 9V Battery 774-0940
2 1 Mohms Resistors, 1/4W 296-0012
2 90.9 ohm Resistors, 1/2W 296-0083
2 422 ohm Resistors, 1/4W 296-0032
1 5V Regulator 263-0136
Additional parts required: PIC 12F675 microcontroller.

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