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Light Break Sensor for Ammo Counter
I have offered ammo counter kits for nerf dart guns for a while now. With a tweak to the ammo counter software’s min time between fire events and the addition of a photo sensor, you can install my ammo counter kit on a nerf gun and keep track of shots remaining in your clip even while full auto firing. What allows this to work is a light break sensor. The part number I recommend is the OPB100Z. It comes with an IR LED and a Phototransistor. The LED creates a beam of light, and the phototransistor acts as a switch. When the light shines on the sensor, the transistor conducts and…
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DIY Ammo Counter
Do you need an ammo counter circuit for your project and are bummed that you have to wait for a spot in my build queue to open up? Fret not, here is a step by step how to make one from scratch! In this guide, I will detail how to build your own ammo counter for ~$25 and with only minimal soldering experience. Parts: Dual Digit Seven Segment 0.56inch ‘Common Cathode’ Display Adafruit Arduino Trinket Lever switches that fit in most projects You can use other arduinos or switch and display choices. The linked ones were chosen for number of pins and size. This project uses 16 IO pins from the arduino…
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Ammo Counter Assembly Instructions
DIY assembly guide for the ammo counter. If you ordered an unassembled circuit kit, this is the instruction page for you. Assembly order is from the center outward to minimize solder bridges. Keep some solder removal braid handy to remove any bridges between pads. BACK OF THE PCB Install the IC, making sure to orient with pin1 indication on the PCB Install the three resistors. 2x 10k on the bottom 100 ohm on the top Install the LEDs and bend into position to match your install location. LED on top center position (unmarked) LED on bottom marked position. Note: The LED polarity is not marked on the board. See the…