stephen70edwards
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stephen70edwards 20/02/2022
I'm using this to drive a single high-power LED lamp (perhaps 10W) and it's working fine: nice uniform brightness and it runs very cool. It took me a while to dial in the appropriate current limit (those aren't 10-turn pots; they're like 100-turn!) but once I was able to do that, it worked like a charm. The LED colors and meanings on the product page aren't quite right (some are reversed; "yellow" lights are actually red, etc.) but this isn't a show-stopper.
Módulo redutor de tensão DC-DC de 5-32V para 0.8-30V, regulador de buck ajustável, driver LED constante de 5A e placa de carregamento de bateria
US$3.99 US$9.99
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stephen70edwards 20/02/2022
Works perfectly. I used this to replace one that I broke that was part of a weather station kit. Note that the Vcc and GND pins on this are reversed from some other models; the label on the PCB is correct.
Geekcreit® 0,96 polegadas 4 pinos azul amarelo IIC I2C OLED Módulo de exibição Geekcreit para Arduino - produtos que funcionam com placas oficiais Arduino
US$4.99 US$11.99
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stephen70edwards 28/02/2020
This is a very thin, light sleeping bag that I suspect would quickly become insufficient if the temperature dropped too low. However, for camping in warm environments or for things like kids' sleepovers, it's perfect, especially because it's about 1/2 the size of what I think of as a normal sleeping bag when packed (it's adult-sized otherwise). I use it for naps in my office; please don't tell my boss.
IPRee À Prova D 'Água 210x75 CM Dormir Bolsa Pessoa Única para Caminhadas Ao Ar Livre Camping Quente Soft Adulto Casa Terno Caso
US$48.99 US$58.99
4
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Módulo de contador de Geiger Geekcreit montado Tubo GM de tubo de Miller Radiação nuclear Geekcreit para Arduino - produtos que funcionam com placas Arduino oficiais
US$43.99 US$40.99

Q: My assembled Geiger counter just arrived. The power light comes on, the high voltage appears to be correct, and touching the - connector of the tube with a probe does cause beeping and D23 to light briefly, but it is silent when left alone. Is there a way to test the tube? The tube seems intact, but I don't know what I'm looking for. I believe it should detect some background radiation, perhaps a click every few seconds?

perguntado por stephen70edwards sobre 2020-10-17 09:55:14

István Szegedi Csak a régi fusterzekelokben americium 241

2021-08-11 06:34:59 Útil (0)
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stephen70edwards 14/08/2020
These are light (anodized, machined aluminum) but solid and well-made with three strategically placed tripod mount threads. Unlike most spring-activated cellphone clamps, these clamp down with a hand-operated screw, so you can probably crush your phone if you work at it. Overall, I'm quite pleased, but they still seem a little pricey for what they are. But it's probably worth having one that will not break or accidentally release.
Ulanzi ST-02S Metal Telefone Inteligente Suporte Tripé Suporte Adaptador Acessório braçadeira Clipe Suporte de Telefone Celular
US$10.99 US$22.99
0
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stephen70edwards 21/04/2020
A nice little kit. Included nice, easy-to-follow English assembly instructions and came well-packaged. There's quite a variety of resistor values and they were difficult to read; a meter was definitely needed to check their values. It's powered through a micro-USB connector on the LCD board, which makes it easy to power, say, from a portable USB powerbank. The probe setup is a little odd: you can either solder in the JST connector and connect the included little probes, or solder in the included BNC jack that allows the use of more conventional probes (the low analog bandwidth of this scope means "real" scope probes probably aren't necessary). It would had been nice to see this spelled out more clearly before I soldered in the JST connector, or better yet, have space for both.
Original JYETech 13805K DSO138mini DIY Digital Osciloscópio Kit SMD pré-soldado 200KHz 3,5V-6V DC
US$27.99 US$34.99
0
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stephen70edwards 08/03/2020
Nice little amplifier module. I bought the version with a "case," which was a good idea (laser-cut plexiglass below; PCB material above) and it makes it a little more convenient, but it would have been nice had they recessed the screws on the bottom or used feet because the screws on the bottom stick out. Regardless, the module sounds nice for the price.
502C HIFI 2x50W TPA3116 AUX + bluetooth 5.0 HIFI Amplificador digital de alta potência Placa estéreo AMP Amplificador Home Theater
US$14.99 US$17.99
1
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stephen70edwards 08/03/2020
Worked perfectly. Make sure to set the processor to "Atmega 328P (Old Bootloader)" in the Arduino GUI. You may also need to install different drivers for the USB-to-serial adapter chip.
5Pcs ATmega328P Nano V3 Módulo Versão Melhorada Sem Cabo Geekcreit para Arduino - produtos que funcionam com placas Arduino oficiais
US$44.99 US$47.99
0
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stephen70edwards 29/02/2020
A cute little kit for my ten-year-old daughter and me to assemble. The illustrated instructions were in Chinese, but decipherable enough, and the Styrofoam balls for the head and torso were a little crushed in shipping, but the kit came with all the pieces (including glue) and worked as advertised.
DIY Sportbike RC Robô Brinquedo STEAM Kit Educacional Presente Para Crianças
US$8.19 US$9.71
0
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stephen70edwards 09/02/2020
Fun to assemble with my ten-year-old daughter, but not perfect. The screws holding the edges together are tricky to install and not all that strong; the "finger" mechanism moves too fast, almost making it dangerous to operate; and my daughter managed to break the hinge (a little notch on the base that pokes into a hole on the cover) by carrying it in her backpack.
Kit de montagem da caixa inútil. Máquina inútil como presente de aniversário. Brinquedos geek para escritório ou casa. Divertida decoração de mesa.
US$18.99 US$22.99
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stephen70edwards 11/12/2019
The latch mechanism works nicely and it looks good enough. However, the belt is wider than I expected or wanted (it barely fits the belt loops on my jeans, which will make it awkward to remove at, say, the airport), and the belt itself is stiff enough to make the adjustable part of the buckle slip rather easily. I find myself constantly having to draw it tight again.
Cinto tático de nylon elástico magnético sem furos AWMN ES19 de 125 cm para homens e mulheres.
US$10.39 US$14.20
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stephen70edwards 03/10/2018
This the most beautiful tool I own. The case is gray anodized aluminum (?); the inner carrier clicks in and holds, then clicks out; the screwdriver tips are held in by magnets; the tips themselves are labeled as are their compartments; and the whole thing is color-coordinated and surface-coordinated (the tips are also all gray with a similar finish as the case). I'm almost afraid to put the case in a toolbox lest I scratch it; it's that pretty. I haven't used the tips long enough to know whether they're especially durable, but things look great so far.
Conjunto de chaves de fenda de precisão multiuso XIAOMI Mijia de 24 em 1 de alumínio com pontas de aço S2 para reparo
US$32.99 US$42.99
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stephen70edwards 11/07/2018
This is a challenging kit to assemble because no instructions are provided. More hardware (specifically spacers and M3 screws) should be provided, the servo doesn't quite fit the pan/tilt head provided, and there's no elegant way to attach the ultrasonic sensor to its mount. Nevertheless, this is a fun kit to assemble and operate and an excellent value for the money. I've written instructions and some firmware for this kit: http://www.cs.columbia.edu/~sedwards/presentations/robot-car-instructions.pdf http://www.cs.columbia.edu/~sedwards/presentations/robot-car.zip You need female-to-female jumper wires to connect the ultrasonic sensor and the L298N to the Arduino. For the ultrasonic sensor, these need to be long (20 cm). You need to solder wires to the motors. To use the power switch, you need to solder wires to it, although the kit can be made to work without it. The servo arms aren't quite the right ones for the black pan/tilt head provided to mount the ultrasonic sensor; you need to clip and trim the dual-arm head to work. Attaching the ultrasonic sensor to the pan/tilt head isn't obvious: twist ties work, as do rubber bands. Make sure to center the servo motor before you assemble the pan/tilt head; it's hard to adjust once it is attached to the baseplate.
Geekcreit® DIY L298N 2WD Kit de Carro Robô de Rastreamento Inteligente Ultrassônico para Arduino - produtos que funcionam com placas oficiais do Arduino
US$25.90 US$27.00
1
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stephen70edwards 03/06/2018
This is a clever phone mount: you separate the jaws, they hold open, then when you push the phone between them, they close. Definitely helpful. The other thing I was struck by was the stickiness of the suction cup: it's extreme. For people who plan to leave it attached to their dashboard/windshield, it's great, but since I tend to move mine from car-to-car, I'm concerned it will pick up dust and lose its effectiveness.
Universal Foldable Sucker Car Windshield Holder Desktop Phone Clip Mount Mount para iPhone Samsung
US$10.99 US$12.99
0
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stephen70edwards 26/04/2018
I bought ten of these and helped a group of 9-year-olds assemble them. The exercise was a success, but not perfect. Positives: * Good value for the price; cheap enough to give away as party favors * The cup + eyes actually offered enough flexibility for each kid to be able to personalize their robot. One child put the two eyes vertically instead of horizontally; many others opted for the "cyclops" look. * Each one worked; no missing or broken pieces in the kits * No soldering was necessary * Assembly was straightforward, even with Chinese-only instructions Negatives: * This is is no way a "line-following" or "obstacle avoidance" robot. The drive wheels are attached to a differential that randomly (chaotically?) switches between moving "forward" and turning. It's amusing, but don't expect any sort of deliberate behavior. The kids were a little frustrated when we tried a "robot race." * The alligator clips were difficult to operate: the plastic coverings were too slippery for little (or adult) hands to effectively grip to open * Many of the little yellow paper cups had been partially crushed in transit * No AA battery was included; these need to be bought separately * Since all major joints were made with double-sided foam, these are not likely to hold together well over time. For our application, this was fine, however.
Brinquedos científicos de invenção educacional robô elétrico automático de evasão de obstáculos DIY
US$3.99 US$8.99
1
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stephen70edwards 31/01/2018
This consists of an FTDI FT2232HL (64-pin LQFP package) with two 26-pin breakout headers (unsoldered, so you can solder in something else if you want), a USB type A connector, and power conditioning circuitry. It does *not* include an EEPROM that could be used to change its initial power-on state, although the pins for connecting one are on the breakout connectors (CLK CS DAT). I couldn't find a schematic for the board, but its structure seems straightforward enough. Under Linux (I'm running Ubuntu 16.04), the default drivers make it appear as two serial ports (/dev/ttyUSB0 and /dev/ttyUSB1), but this is just one of its many modes. the FTDI website has a good datasheet explaining how it can be used as a parallel FIFO, for "bit-banging" nearly arbitrary protocols, a flexible serial mode capable of I2C, SPI, and others, and a "host MCU" mode that makes it appear like an 8051 to peripherals. You have two options for device drivers: Under windows the D2XX library is FTDI's own proprietary driver that lets you control the chip. FTDI also releases D2XX under Linux, but libftdi is a nearly identical open-source library that also give you access. apt install libftdi-dev installed it for me. The use of an USB A connector is a little unusual. On the one hand, it means you can plug this board directly into a Raspberry Pi, laptop, or desktop. On the other hand, it means you need a USB extender cable instead of a much-more-common mini- or micro-USB cable if you want or need to separate the board from the USB port. I would have preferred a mini USB (B) connector instead as they're small yet durable.
CJMCU-2232 FT2232HL USB TURN UART / FIFO / SPI / I2C / JTAG / RS232 Memória externa do módulo
US$10.07
0
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