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Description
Geiger Countersku: SEN 10742 We've revised the Geiger counter once again, this time replacing the switch with a more robust right angle switch. This version also includes the necessary capacitor to support Arduino's auto reset feature. This USB powered Geiger Counter is equipped with an ATMega328 that can be programmed in circuit using one of the programmers below. Simply plug the unit into USB (make sure you have FTDI drivers installed), open a terminal program to
sku: SEN-10742
We've revised the Geiger counter once again, this time replacing the switch with a more robust right angle switch. This version also includes the necessary capacitor to support Arduino's auto-reset feature. This USB powered Geiger Counter is equipped with an ATMega328 that can be programmed in circuit using one of the programmers below. Simply plug the unit into USB (make sure you have FTDI drivers installed), open a terminal program to the correct COM port at 9600bps, and you will see random bits being generated from the random background radiation. Each bit generated (actually an ASCII byte, 0 or 1) represents an actual event in the tube in real-time, so the output can be used to deduce CPM or what ever units you need. Here at SparkFun, on average, we get about 25 counts a minute.
Check out the random number generating Geiger counter tutorial for more information.
Also, check out the live Geiger Counter feed from SparkFun headquarters.
Note: While the Geiger counter is powered and the switch is in the ON position, the board contains exposed high voltage components. In order to turn the unit off, you must flip the tube power switch to OFF while the USB cable is plugged in or while the board is still connected to your power supply. The reason being; when you move the switch into the OFF position, the high voltage lines are bled out through a resistor connected to ground, more information on this is in the tutorial.
A project box or enclosure is suggested. Do not touch the end window of the Geiger tube and do not to touch any conductive region inside the area marked HIGH VOLTAGE when the Geiger tube is powered ON. An enclosure is not absolutely necessary, but if you choose not use an enclosure, remember to be extra careful with the end window and high voltage regions.
The Geiger tube comes with a red boot to protect the end window during production, handling, and shipping. The boot should be removed if you need to detect alpha particles. However, you should still see activity from gamma and beta particles even with the boot on.
We do not ship this product to Cuba, Iran, North Korea, Sudan or Syria.
Note: This product is for educational purposes and should not be directly relied upon for determinations regarding one's health or safety.
WARNING : This product contains high voltage. Do not touch board when it is switched on.
Features
- 5V@30mA input
- LND712 Geiger tube
- ATMega328
- FTDI USB
- Power and status LEDs
- TTL output pin from tube
Dimensions: 4.15"x1.75"x1" (without standoffs)
Documents
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4.3 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 5
It fit great and looks good on me
Size: X-Large, Color: Khaki
Very good quality for your money 💰
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 8, 2026
★★★★★ 4
**Title: Perfect Fit and Style for the Price!**
Size: XX-Large, Color: Navy Blue
I recently purchased the Gafeng Men's Trench Coat in XXL, and I couldn't be happier with my choice! At 6'2" and 210 lbs with an athletic build, I was initially concerned about finding the right fit, but this coat exceeded my expectations. The fit is perfect—tailored yet comfortable—and the length is just right.
The style matches the pictures exactly, which is something I’ve struggled with in past purchases. The lightweight, wooly fabric is surprisingly warm, making it ideal for winter without feeling bulky.
For the cost, this coat is a fantastic deal. It looks sharp enough for business attire while still being versatile for casual outings. Highly recommend for anyone looking for a stylish and functional overcoat!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 13, 2025
★★★★★ 5
Nice and soft
Size: X-Large, Color: Gray, Size: X-Large, Color: Gray
Great item and good fit for my ordered size, nice and soft clothing
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 19, 2026
★★★★★ 5
Great choice
Fit perfect.
I recommend it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 3, 2025
★★★★★ 3
Definitely NOT the COLOR that’s advertised but not bad
I got this for my son for him to have his 1st official “dressy” coat for certain occasions. It will do for the price, but as I said in the description, it’s definitely not the color that’s shown in the advertisement. Its also not taken in like the picture. But not bad. It’s more of a camel color than a khaki like the advertisement. My son is 5’9 and has a slim build, I bought a L because he’s tall and this fits fine to be honest. I want him to be able to grow into it next year as well. If you have long arms you may wanna size up.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 28, 2022
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