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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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4.6 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 4
Good product, but small in quantity.
Scent: Rain Water, Size: 33 Fl Oz (Pack of 1)
I like this soap a lot, but the size surprised me enough that it is worth mentioning.
The Rainwater scent is clean and subtle, not overpowering or perfumey. The soap itself is clear, rinses clean, and does not leave my hands feeling dry or coated. I also appreciate that it is a more chemical conscious option that still works well for frequent handwashing.
That said, I was genuinely surprised by how small the refill container was. Yes, the ounces are listed right on the ad and package, but the bottle itself looks tiny in comparison to what I expected from the photo. For the price, the quantity felt underwhelming, and that ultimately led me to return it.
If the cost-to-quantity ratio made more sense, I would absolutely keep this on hand, because the product itself is very nice. Just go into it knowing the refill is smaller than you might expect based on the packaging.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 4, 2026
★★★★★ 5
Great hand soap
Scent: Rain Water, Size: 33 Fl Oz (Pack of 1)
Excellent product. The fragrance is subtle and fresh. The hand soap is gentle to the hands and it leaves a sensation of cleanness. I'm very satisfied with my purchase.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2026
★★★★★ 5
Good value for the money.
Scent: Rain Water, Size: 33 Fl Oz (Pack of 1)
Love Mrs. Meyers products. Cleans well, smells good. Gentle on your skin. Good value for the money
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 29, 2026
★★★★★ 5
On my second bottle...
Scent: Rain Water, Size: 33 Fl Oz (Pack of 1)
I've now purchased two bottles of this hand soap. I love the smell! The soap itself is gentle but effective. It cleans well without drying out my hands, even with frequent use. I appreciate that it’s made with ingredients like aloe vera and essential oils, which helps keep my skin feeling soft instead of stripped. The scent is light, fresh, and clean without being overpowering. The “Rain Water” fragrance has a subtle, slightly floral smell that makes washing your hands feel a little more refreshing and enjoyable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 22, 2026
★★★★★ 5
Soft Cotton Rounds That Work Well for Skincare
Size: 100 Count (Pack of 1), Size: 100 Count (Pack of 1)
These cotton rounds are soft, durable, and work well for everyday skincare and makeup removal. They don’t fall apart easily when using toner or micellar water, which I appreciate. The packaging is simple and convenient, and the quantity is great for the price. Overall, a reliable product to keep on hand.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 7, 2026
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